fix(web): minor UI refinements across header, pills, swipe, and settings

- Remove ThemeSwitcher from header (already accessible via settings)
- Increase pill padding and font size for better tap targets
- Guard non-cancelable touchmove preventDefault in SwipeAction
- Restyle settings page with grid-area layout and inline sign-out button

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

opal-task/docs/api.md

@@ -0,0 +1,921 @@
+# Opal-Task API Reference
+
+REST API for the opal task manager. Built with Go and [chi](https://github.com/go-chi/chi) router, backed by SQLite.
+
+**Base URL:** `http://localhost:8080` (default) or behind a reverse proxy at `/api`
+
+## Table of Contents
+
+- [Authentication](#authentication)
+- [Response Format](#response-format)
+- [Endpoints](#endpoints)
+  - [Health](#health)
+  - [OAuth](#oauth)
+  - [Tasks](#tasks)
+  - [Tags](#tags)
+  - [Projects](#projects)
+  - [Sync](#sync)
+  - [API Keys](#api-keys)
+- [Data Models](#data-models)
+- [Reports](#reports)
+
+---
+
+## Authentication
+
+The API supports two authentication methods:
+
+### API Key
+
+Generate a key with the CLI, then pass it as a Bearer token:
+
+```bash
+opal server keygen --name "My Phone"
+# Output: oak_aBcDeFgH... (shown once, save it)
+```
+
+```
+Authorization: Bearer oak_aBcDeFgH...
+```
+
+Keys are bcrypt-hashed at rest. The `oak_` prefix identifies opal API keys.
+
+### OAuth / JWT
+
+When OAuth is enabled, authenticate through the [login flow](#get-authlogin) to receive a JWT:
+
+```
+Authorization: Bearer eyJhbGciOiJIUzI1NiIs...
+```
+
+JWTs are HS256-signed, issued by `opal-task`, and expire after 1 hour by default (configurable via `JWT_EXPIRY`).
+
+### Public Endpoints
+
+These endpoints require no authentication:
+
+| Endpoint | Description |
+|---|---|
+| `GET /health` | Health check |
+| `GET /auth/login` | Get OAuth login URL |
+| `POST /auth/callback` | OAuth code exchange |
+| `POST /auth/refresh` | Refresh access token |
+| `POST /auth/logout` | Revoke refresh token |
+
+All other endpoints require a valid `Authorization: Bearer <token>` header.
+
+---
+
+## Response Format
+
+Every response follows this envelope:
+
+### Success
+
+```json
+{
+  "success": true,
+  "data": { ... }
+}
+```
+
+### Error
+
+```json
+{
+  "success": false,
+  "error": "description of what went wrong"
+}
+```
+
+### Conventions
+
+- **JSON keys** are `snake_case` throughout.
+- **Timestamps** are Unix seconds (integers), not ISO 8601 strings. Nullable timestamps are `null`.
+- **Durations** (e.g., `recurrence_duration`) are in seconds. A 1-week recurrence is `604800`.
+- **Status** is a single-character string: `"P"`, `"C"`, `"D"`, or `"R"`.
+
+### Status Codes
+
+| Code | Meaning |
+|---|---|
+| `200` | Success |
+| `201` | Resource created |
+| `400` | Invalid input (bad JSON, missing required fields, invalid UUID) |
+| `401` | Missing or invalid authentication |
+| `404` | Resource not found |
+| `500` | Server error |
+| `501` | Feature disabled (e.g., OAuth not configured) |
+
+---
+
+## Endpoints
+
+### Health
+
+#### `GET /health`
+
+Returns server status. No authentication required.
+
+```bash
+curl http://localhost:8080/health
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "status": "ok"
+  }
+}
+```
+
+---
+
+### OAuth
+
+#### `GET /auth/login`
+
+Returns the OAuth authorization URL for redirecting the user to the identity provider.
+
+```bash
+curl http://localhost:8080/auth/login
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "url": "https://auth.example.com/application/o/authorize/?client_id=...&state=abc123",
+    "state": "abc123"
+  }
+}
+```
+
+Returns `501` if OAuth is not enabled.
+
+---
+
+#### `POST /auth/callback`
+
+Exchanges an OAuth authorization code for access and refresh tokens. The `code` parameter comes from the OAuth provider's redirect.
+
+**Query parameters:**
+
+| Parameter | Type | Required | Description |
+|---|---|---|---|
+| `code` | string | yes | Authorization code from OAuth provider |
+
+```bash
+curl -X POST "http://localhost:8080/auth/callback?code=AUTH_CODE_HERE"
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "access_token": "eyJhbGciOiJIUzI1NiIs...",
+    "refresh_token": "dGhpcyBpcyBhIHJlZnJl...",
+    "expires_at": 1739700000,
+    "token_type": "Bearer",
+    "user": {
+      "id": 1,
+      "username": "alice",
+      "email": "alice@example.com"
+    }
+  }
+}
+```
+
+---
+
+#### `POST /auth/refresh`
+
+Exchanges a valid refresh token for a new access token.
+
+**Request body:**
+
+```json
+{
+  "refresh_token": "dGhpcyBpcyBhIHJlZnJl..."
+}
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "access_token": "eyJhbGciOiJIUzI1NiIs...",
+    "expires_at": 1739703600,
+    "token_type": "Bearer"
+  }
+}
+```
+
+Returns `401` if the refresh token is invalid or expired.
+
+---
+
+#### `POST /auth/logout`
+
+Revokes a refresh token, preventing further use.
+
+**Request body:**
+
+```json
+{
+  "refresh_token": "dGhpcyBpcyBhIHJlZnJl..."
+}
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "message": "logged out"
+  }
+}
+```
+
+---
+
+### Tasks
+
+#### `GET /tasks`
+
+Lists tasks, either by named report or by filter parameters.
+
+**Query parameters:**
+
+| Parameter | Type | Required | Description |
+|---|---|---|---|
+| `report` | string | no | Named report (see [Reports](#reports)). Overrides filter params. |
+| `status` | string | no | Filter by status: `pending`, `completed`, `deleted`, `recurring` |
+| `project` | string | no | Filter by project name |
+| `priority` | string | no | Filter by priority: `L`, `D`, `M`, `H` |
+| `tag` | string[] | no | Filter by tags (repeat for multiple: `?tag=home&tag=urgent`) |
+
+**With report:**
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8080/tasks?report=overdue"
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "report": "overdue",
+    "tasks": [ ... ],
+    "count": 3
+  }
+}
+```
+
+**With filters:**
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8080/tasks?status=pending&tag=home&priority=H"
+```
+
+```json
+{
+  "success": true,
+  "data": [
+    {
+      "uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+      "id": 42,
+      "status": "P",
+      "description": "Fix leaking faucet",
+      "project": "house",
+      "priority": 3,
+      "created": 1739174400,
+      "modified": 1739545800,
+      "start": null,
+      "end": null,
+      "due": 1740009600,
+      "scheduled": null,
+      "wait": null,
+      "until": null,
+      "recurrence_duration": null,
+      "parent_uuid": null,
+      "tags": ["home", "urgent"],
+      "urgency": 12.4
+    }
+  ]
+}
+```
+
+---
+
+#### `POST /tasks`
+
+Creates a new task using structured JSON fields.
+
+**Request body:**
+
+| Field | Type | Required | Description |
+|---|---|---|---|
+| `description` | string | yes | Task description |
+| `tags` | string[] | no | Tags to attach |
+| `project` | string | no | Project name |
+| `priority` | string | no | `L` (low), `D` (default), `M` (medium), `H` (high) |
+| `due` | int64 | no | Due date as Unix timestamp (seconds) |
+| `scheduled` | int64 | no | Scheduled date as Unix timestamp |
+| `wait` | int64 | no | Wait-until date as Unix timestamp |
+| `until` | int64 | no | Expiration date as Unix timestamp |
+| `recurrence` | string | no | Recurrence interval (e.g., `1d`, `2w`, `3m`, `1y`) |
+
+```bash
+curl -X POST http://localhost:8080/tasks \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "description": "Buy groceries",
+    "tags": ["personal", "errands"],
+    "project": "household",
+    "priority": "M",
+    "due": 1739836800
+  }'
+```
+
+**Response** (`201 Created`):
+
+```json
+{
+  "success": true,
+  "data": {
+    "uuid": "f47ac10b-58cc-4372-a567-0e02b2c3d479",
+    "id": 43,
+    "status": "P",
+    "description": "Buy groceries",
+    "project": "household",
+    "priority": 2,
+    "created": 1739750400,
+    "modified": 1739750400,
+    "due": 1739836800,
+    "tags": ["personal", "errands"],
+    "urgency": 6.1
+  }
+}
+```
+
+---
+
+#### `POST /tasks/parse`
+
+Creates a task from a CLI-style input string. Supports the same syntax as the `opal add` command: words without special prefixes become the description, `+tag` adds tags, `-tag` removes tags, and `key:value` pairs set attributes.
+
+**Request body:**
+
+| Field | Type | Required | Description |
+|---|---|---|---|
+| `input` | string | yes | CLI-style task input |
+
+**Modifier syntax:**
+
+| Syntax | Meaning | Example |
+|---|---|---|
+| `+tag` | Add tag | `+home` |
+| `-tag` | Remove tag | `-garden` |
+| `project:name` | Set project | `project:household` |
+| `priority:X` | Set priority | `priority:H` |
+| `due:value` | Set due date | `due:tomorrow`, `due:monday`, `due:2026-03-01` |
+| `scheduled:value` | Set scheduled date | `scheduled:nextweek` |
+| `wait:value` | Set wait date | `wait:friday` |
+| `until:value` | Set expiration | `until:eom` |
+| `recur:interval` | Set recurrence | `recur:1w`, `recur:2d` |
+
+```bash
+curl -X POST http://localhost:8080/tasks/parse \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"input": "Change bed sheets +home project:household due:sunday recur:1w"}'
+```
+
+**Response** (`201 Created`):
+
+```json
+{
+  "success": true,
+  "data": {
+    "task": {
+      "uuid": "c9bf9e57-1685-4c89-bafb-ff5af830be8a",
+      "id": 44,
+      "status": "P",
+      "description": "Change bed sheets",
+      "project": "household",
+      "priority": 1,
+      "created": 1739750400,
+      "modified": 1739750400,
+      "due": 1739836800,
+      "recurrence_duration": 604800,
+      "parent_uuid": "d4e5f6a7-b8c9-0123-4567-890abcdef012",
+      "tags": ["home"],
+      "urgency": 5.3
+    }
+  }
+}
+```
+
+For recurring tasks (those with `recur:`), the API creates a template task (status `"R"`) and returns the first instance.
+
+---
+
+#### `GET /tasks/{uuid}`
+
+Returns a single task by its UUID.
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+    "id": 42,
+    "status": "P",
+    "description": "Fix leaking faucet",
+    "project": "house",
+    "priority": 3,
+    "created": 1739174400,
+    "modified": 1739545800,
+    "due": 1740009600,
+    "tags": ["home", "urgent"],
+    "urgency": 12.4
+  }
+}
+```
+
+Returns `404` if the UUID does not match any task.
+
+---
+
+#### `PUT /tasks/{uuid}`
+
+Updates one or more fields on an existing task. Only include the fields you want to change.
+
+**Request body:**
+
+| Field | Type | Description |
+|---|---|---|
+| `description` | string | New description |
+| `status` | string | New status: `pending`, `completed`, `deleted` |
+| `priority` | string | `L`, `D`, `M`, `H` |
+| `project` | string | Project name |
+| `due` | int64 | Unix timestamp (seconds) |
+| `scheduled` | int64 | Unix timestamp |
+| `wait` | int64 | Unix timestamp |
+| `until` | int64 | Unix timestamp |
+| `start` | int64 | Unix timestamp |
+| `recurrence` | string | Recurrence interval |
+
+All fields are optional.
+
+```bash
+curl -X PUT http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890 \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"priority": "H", "due": 1739923200}'
+```
+
+**Response:**
+
+```json
+{
+  "success": true,
+  "data": {
+    "uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+    "id": 42,
+    "status": "P",
+    "description": "Fix leaking faucet",
+    "project": "house",
+    "priority": 3,
+    "created": 1739174400,
+    "modified": 1739750400,
+    "due": 1739923200,
+    "tags": ["home", "urgent"],
+    "urgency": 14.7
+  }
+}
+```
+
+---
+
+#### `DELETE /tasks/{uuid}`
+
+Deletes a task. By default, sets the task status to `"D"` (soft delete). Pass `permanent=true` to remove it from the database entirely.
+
+**Query parameters:**
+
+| Parameter | Type | Default | Description |
+|---|---|---|---|
+| `permanent` | string | `false` | Set to `true` for permanent deletion |
+
+```bash
+# Soft delete
+curl -X DELETE -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890
+
+# Permanent delete
+curl -X DELETE -H "Authorization: Bearer $TOKEN" \
+  "http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890?permanent=true"
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "message": "task deleted"
+  }
+}
+```
+
+---
+
+#### `POST /tasks/{uuid}/complete`
+
+Marks a task as completed. Sets the status to `"C"` and records the completion time. For recurring task instances, this may trigger creation of the next instance.
+
+```bash
+curl -X POST -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890/complete
+```
+
+**Response:** The updated task object with `"status": "C"`.
+
+---
+
+#### `POST /tasks/{uuid}/start`
+
+Marks a task as actively being worked on by setting its `start` timestamp to now.
+
+```bash
+curl -X POST -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890/start
+```
+
+**Response:** The updated task object with `start` set to the current unix timestamp.
+
+---
+
+#### `POST /tasks/{uuid}/stop`
+
+Clears the `start` timestamp, marking the task as no longer actively being worked on.
+
+```bash
+curl -X POST -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890/stop
+```
+
+**Response:** The updated task object with `start` cleared to `null`.
+
+---
+
+### Task Tags
+
+#### `GET /tasks/{uuid}/tags`
+
+Returns the tag list for a specific task.
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890/tags
+```
+
+```json
+{
+  "success": true,
+  "data": ["home", "urgent"]
+}
+```
+
+---
+
+#### `POST /tasks/{uuid}/tags`
+
+Adds a tag to a task.
+
+**Request body:**
+
+```json
+{
+  "tag": "important"
+}
+```
+
+**Response:** The updated task object.
+
+---
+
+#### `DELETE /tasks/{uuid}/tags/{tag}`
+
+Removes a tag from a task.
+
+```bash
+curl -X DELETE -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/tasks/a1b2c3d4-e5f6-7890-abcd-ef1234567890/tags/urgent
+```
+
+**Response:** The updated task object.
+
+---
+
+### Tags
+
+#### `GET /tags`
+
+Returns all tags used across all tasks.
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" http://localhost:8080/tags
+```
+
+```json
+{
+  "success": true,
+  "data": ["errands", "home", "important", "personal", "urgent", "work"]
+}
+```
+
+---
+
+### Projects
+
+#### `GET /projects`
+
+Returns all project names used across all tasks.
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" http://localhost:8080/projects
+```
+
+```json
+{
+  "success": true,
+  "data": ["household", "work", "garden"]
+}
+```
+
+---
+
+### Sync
+
+These endpoints power the multi-device sync protocol. The CLI client uses them via `opal sync` commands.
+
+#### `POST /sync/changes`
+
+Returns all changes recorded since a given timestamp. Used by clients to pull updates from the server.
+
+**Request body:**
+
+| Field | Type | Required | Description |
+|---|---|---|---|
+| `since` | int64 | yes | Unix timestamp (seconds). Return changes after this time. Use `0` for initial sync. |
+| `client_id` | string | yes | Unique identifier for the syncing device |
+
+```bash
+curl -X POST http://localhost:8080/sync/changes \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{"since": 1739600000, "client_id": "phone-abc123"}'
+```
+
+```json
+{
+  "success": true,
+  "data": [
+    {
+      "id": 101,
+      "task_uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+      "change_type": "create",
+      "changed_at": 1739650000,
+      "data": "description:Buy groceries\nstatus:80\npriority:2"
+    },
+    {
+      "id": 102,
+      "task_uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+      "change_type": "update",
+      "changed_at": 1739660000,
+      "data": "status:67"
+    }
+  ]
+}
+```
+
+The `change_type` is one of `create`, `update`, or `delete`. The `data` field uses a `key:value` format with newline separators, recorded by database triggers on every task mutation. Note that change log data uses raw database values (integer status codes), not the API's serialized format.
+
+---
+
+#### `POST /sync/push`
+
+Pushes local task changes to the server. Conflicts are resolved with **last-write-wins** based on the `modified` timestamp.
+
+**Request body:**
+
+| Field | Type | Required | Description |
+|---|---|---|---|
+| `tasks` | Task[] | yes | Array of full task objects to push |
+| `client_id` | string | yes | Unique identifier for the syncing device |
+
+```bash
+curl -X POST http://localhost:8080/sync/push \
+  -H "Authorization: Bearer $TOKEN" \
+  -H "Content-Type: application/json" \
+  -d '{
+    "client_id": "phone-abc123",
+    "tasks": [
+      {
+        "uuid": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
+        "status": "P",
+        "description": "Buy groceries",
+        "priority": 2,
+        "created": 1739600000,
+        "modified": 1739650000,
+        "tags": ["personal"]
+      }
+    ]
+  }'
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "processed": 1,
+    "conflicts": 0
+  }
+}
+```
+
+- **processed** — number of tasks successfully applied
+- **conflicts** — number of tasks where the server had a newer version (still applied via last-write-wins)
+
+---
+
+### API Keys
+
+#### `GET /auth/keys`
+
+Lists all API keys for the current user. The key value itself is not returned (it is only shown once at creation time).
+
+```bash
+curl -H "Authorization: Bearer $TOKEN" http://localhost:8080/auth/keys
+```
+
+```json
+{
+  "success": true,
+  "data": [
+    {
+      "id": 1,
+      "name": "My Phone",
+      "user_id": 1,
+      "created_at": 1736935200,
+      "last_used": 1739558400,
+      "revoked": false
+    }
+  ]
+}
+```
+
+---
+
+#### `DELETE /auth/keys/{id}`
+
+Revokes an API key. The key becomes immediately unusable.
+
+**URL parameters:**
+
+| Parameter | Type | Description |
+|---|---|---|
+| `id` | int | API key ID |
+
+```bash
+curl -X DELETE -H "Authorization: Bearer $TOKEN" \
+  http://localhost:8080/auth/keys/1
+```
+
+```json
+{
+  "success": true,
+  "data": {
+    "message": "API key revoked"
+  }
+}
+```
+
+---
+
+## Data Models
+
+### Task
+
+| Field | Type | Description |
+|---|---|---|
+| `uuid` | string | Unique identifier (UUID v4) |
+| `id` | int | Auto-increment database ID |
+| `status` | string | `"P"` (pending), `"C"` (completed), `"D"` (deleted), `"R"` (recurring) |
+| `description` | string | Task description |
+| `project` | string \| null | Project name |
+| `priority` | int | `0` = Low, `1` = Default, `2` = Medium, `3` = High |
+| `created` | int | Unix timestamp (seconds) |
+| `modified` | int | Unix timestamp (seconds) |
+| `start` | int \| null | When the task was started (actively being worked on) |
+| `end` | int \| null | When the task was completed or deleted |
+| `due` | int \| null | Deadline |
+| `scheduled` | int \| null | Earliest date the task is actionable |
+| `wait` | int \| null | Task is hidden until this date |
+| `until` | int \| null | Task auto-deletes after this date |
+| `recurrence_duration` | int \| null | Recurrence interval in seconds (e.g., `604800` = 1 week) |
+| `parent_uuid` | string \| null | UUID of the recurring template task |
+| `tags` | string[] | Attached tags |
+| `urgency` | float | Computed urgency score (higher = more urgent) |
+
+#### Status Values
+
+| Value | Meaning |
+|---|---|
+| `"P"` | Pending — active, not yet completed |
+| `"C"` | Completed |
+| `"D"` | Deleted (soft delete) |
+| `"R"` | Recurring template |
+
+#### Priority Values
+
+| API Input | Numeric Value | Meaning |
+|---|---|---|
+| `L` | `0` | Low |
+| `D` | `1` | Default |
+| `M` | `2` | Medium |
+| `H` | `3` | High |
+
+Use the letter codes (`L`, `D`, `M`, `H`) when creating or updating tasks. Responses return the numeric value.
+
+---
+
+## Reports
+
+Named reports return pre-filtered, pre-sorted task lists. Pass the report name as `?report=<name>` on `GET /tasks`.
+
+| Report | Description |
+|---|---|
+| `active` | Tasks that have been started (pending with a `start` time) |
+| `all` | All tasks including recurring templates |
+| `completed` | Completed tasks |
+| `list` | Pending tasks (default view) |
+| `minimal` | Minimal output view |
+| `newest` | Pending tasks sorted newest first |
+| `next` | Next task due |
+| `oldest` | Pending tasks sorted oldest first |
+| `overdue` | Tasks past their due date |
+| `ready` | Tasks ready to work on (past scheduled date, not waiting) |
+| `recurring` | Recurring template tasks |
+| `template` | Alias for `recurring` |
+| `waiting` | Tasks with a future `wait` date |
+
+---
+
+## CORS
+
+The API allows cross-origin requests:
+
+- **Origins:** `*`
+- **Methods:** `GET`, `POST`, `PUT`, `DELETE`, `OPTIONS`
+- **Headers:** `Content-Type`, `Authorization`
+
+---
+
+## Running the Server
+
+```bash
+# Build
+go build -o opal main.go
+
+# Generate an API key
+./opal server keygen --name "My Device" --db /path/to/opal.db
+
+# Start the server
+./opal server start --addr :8080 --db /path/to/opal.db
+```
+
+### Environment Variables
+
+| Variable | Default | Description |
+|---|---|---|
+| `OAUTH_ENABLED` | `false` | Enable OAuth authentication |
+| `OAUTH_CLIENT_ID` | — | OAuth client ID |
+| `OAUTH_CLIENT_SECRET` | — | OAuth client secret |
+| `OAUTH_ISSUER` | — | OAuth issuer URL |
+| `OAUTH_REDIRECT_URI` | — | OAuth redirect URI |
+| `JWT_SECRET` | — | Secret for signing JWTs |
+| `JWT_EXPIRY` | `3600` | JWT lifetime in seconds |
+| `REFRESH_TOKEN_EXPIRY` | `604800` | Refresh token lifetime in seconds (default 7 days) |
+| `OPAL_DB_PATH` | XDG data dir | Override database file path |
+| `OPAL_CONFIG_DIR` | `~/.config/opal` | Config directory |
+| `OPAL_DATA_DIR` | `~/.local/share/opal` | Data directory |

opal-task/internal/api/handlers/tasks.go

@@ -49,6 +49,9 @@ func ListTasks(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
+		// Report sorts may already populate urgency, but ensure it for all paths
+		engine.PopulateUrgency(tasks...)
+
 		jsonResponse(w, http.StatusOK, map[string]interface{}{
 			"report": reportName,
 			"tasks":  tasks,
@@ -87,6 +90,7 @@ func ListTasks(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(tasks...)
 	jsonResponse(w, http.StatusOK, tasks)
 }
 
@@ -159,6 +163,7 @@ func CreateTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusCreated, task)
 }
 
@@ -178,6 +183,7 @@ func GetTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -271,6 +277,7 @@ func UpdateTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -322,6 +329,7 @@ func CompleteTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -346,6 +354,7 @@ func StartTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -370,6 +379,7 @@ func StopTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -429,6 +439,7 @@ func AddTaskTag(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }
 
@@ -489,6 +500,7 @@ func ParseTask(w http.ResponseWriter, r *http.Request) {
 			errorResponse(w, http.StatusBadRequest, err.Error())
 			return
 		}
+		engine.PopulateUrgency(instance)
 		jsonResponse(w, http.StatusCreated, map[string]interface{}{"task": instance})
 		return
 	}
@@ -500,6 +512,7 @@ func ParseTask(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusCreated, map[string]interface{}{"task": task})
 }
 
@@ -525,5 +538,6 @@ func RemoveTaskTag(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
+	engine.PopulateUrgency(task)
 	jsonResponse(w, http.StatusOK, task)
 }

opal-task/internal/api/handlers/tasks_test.go

@@ -57,8 +57,14 @@ func TestParseTask_DescriptionOnly(t *testing.T) {
 	if !ok {
 		t.Fatal("expected task in data")
 	}
-	if task["Description"] != "buy groceries" {
+	if task["description"] != "buy groceries" {
-		t.Errorf("expected description 'buy groceries', got %v", task["Description"])
+		t.Errorf("expected description 'buy groceries', got %v", task["description"])
+	}
+	if _, ok := task["urgency"]; !ok {
+		t.Error("expected urgency field in response")
+	}
+	if _, ok := task["urgency"].(float64); !ok {
+		t.Error("expected urgency to be a number")
 	}
 }
 
@@ -81,11 +87,11 @@ func TestParseTask_WithModifiers(t *testing.T) {
 
 	data := resp["data"].(map[string]interface{})
 	task := data["task"].(map[string]interface{})
-	if task["Description"] != "review PR" {
+	if task["description"] != "review PR" {
-		t.Errorf("expected description 'review PR', got %v", task["Description"])
+		t.Errorf("expected description 'review PR', got %v", task["description"])
 	}
-	if task["Project"] != "backend" {
+	if task["project"] != "backend" {
-		t.Errorf("expected project 'backend', got %v", task["Project"])
+		t.Errorf("expected project 'backend', got %v", task["project"])
 	}
 }
 
@@ -109,9 +115,9 @@ func TestParseTask_WithRecurrence(t *testing.T) {
 	data := resp["data"].(map[string]interface{})
 	task := data["task"].(map[string]interface{})
 
-	// The returned task should be the first instance (pending, with ParentUUID)
+	// The returned task should be the first instance (pending, with parent_uuid)
-	if task["ParentUUID"] == nil {
+	if task["parent_uuid"] == nil {
-		t.Error("expected ParentUUID to be set for recurring instance")
+		t.Error("expected parent_uuid to be set for recurring instance")
 	}
 }
 

opal-task/internal/engine/auth.go

@@ -3,6 +3,7 @@ package engine
 import (
 	"crypto/rand"
 	"encoding/base64"
+	"encoding/json"
 	"fmt"
 	"time"
 
@@ -11,12 +12,69 @@ import (
 
 // APIKey represents an API key in the database
 type APIKey struct {
-	ID        int
+	ID        int        `json:"id"`
-	Name      string
+	Name      string     `json:"name"`
-	UserID    int
+	UserID    int        `json:"user_id"`
-	CreatedAt time.Time
+	CreatedAt time.Time  `json:"created_at"`
-	LastUsed  *time.Time
+	LastUsed  *time.Time `json:"last_used,omitempty"`
-	Revoked   bool
+	Revoked   bool       `json:"revoked"`
+}
+
+// MarshalJSON emits APIKey with unix timestamps.
+func (k APIKey) MarshalJSON() ([]byte, error) {
+	type keyJSON struct {
+		ID        int    `json:"id"`
+		Name      string `json:"name"`
+		UserID    int    `json:"user_id"`
+		CreatedAt int64  `json:"created_at"`
+		LastUsed  *int64 `json:"last_used,omitempty"`
+		Revoked   bool   `json:"revoked"`
+	}
+
+	var lastUsed *int64
+	if k.LastUsed != nil {
+		v := k.LastUsed.Unix()
+		lastUsed = &v
+	}
+
+	return json.Marshal(keyJSON{
+		ID:        k.ID,
+		Name:      k.Name,
+		UserID:    k.UserID,
+		CreatedAt: k.CreatedAt.Unix(),
+		LastUsed:  lastUsed,
+		Revoked:   k.Revoked,
+	})
+}
+
+// UnmarshalJSON parses APIKey from JSON with unix timestamps.
+func (k *APIKey) UnmarshalJSON(data []byte) error {
+	type keyJSON struct {
+		ID        int    `json:"id"`
+		Name      string `json:"name"`
+		UserID    int    `json:"user_id"`
+		CreatedAt int64  `json:"created_at"`
+		LastUsed  *int64 `json:"last_used,omitempty"`
+		Revoked   bool   `json:"revoked"`
+	}
+
+	var raw keyJSON
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+
+	k.ID = raw.ID
+	k.Name = raw.Name
+	k.UserID = raw.UserID
+	k.CreatedAt = time.Unix(raw.CreatedAt, 0)
+	k.Revoked = raw.Revoked
+
+	if raw.LastUsed != nil {
+		t := time.Unix(*raw.LastUsed, 0)
+		k.LastUsed = &t
+	}
+
+	return nil
 }
 
 // GenerateAPIKey creates a new API key for the given name

opal-task/internal/engine/report.go

@@ -420,7 +420,8 @@ func mergeFilters(base, user *Filter) *Filter {
 	return merged
 }
 
-// sortByUrgency is a helper function to sort tasks by urgency (descending)
+// sortByUrgency is a helper function to sort tasks by urgency (descending).
+// It also populates the Urgency field on each task so the score is available in responses.
 func sortByUrgency(tasks []*Task) []*Task {
 	cfg, _ := GetConfig()
 	coeffs := BuildUrgencyCoefficients(cfg)
@@ -428,11 +429,14 @@ func sortByUrgency(tasks []*Task) []*Task {
 	sorted := make([]*Task, len(tasks))
 	copy(sorted, tasks)
 
+	// Calculate and store urgency on each task
+	for _, t := range sorted {
+		t.Urgency = t.CalculateUrgency(coeffs)
+	}
+
 	for i := 0; i < len(sorted)-1; i++ {
 		for j := i + 1; j < len(sorted); j++ {
-			urgI := sorted[i].CalculateUrgency(coeffs)
+			if sorted[i].Urgency < sorted[j].Urgency {
-			urgJ := sorted[j].CalculateUrgency(coeffs)
-			if urgI < urgJ {
 				sorted[i], sorted[j] = sorted[j], sorted[i]
 			}
 		}

opal-task/internal/engine/task.go

@@ -1,6 +1,7 @@
 package engine
 
 import (
+	"encoding/json"
 	"fmt"
 	"time"
 
@@ -16,6 +17,24 @@ const (
 	StatusRecurring Status = 'R'
 )
 
+// MarshalJSON encodes Status as a single-character string (e.g. "P", "C").
+func (s Status) MarshalJSON() ([]byte, error) {
+	return json.Marshal(string(s))
+}
+
+// UnmarshalJSON decodes a single-character string into a Status.
+func (s *Status) UnmarshalJSON(data []byte) error {
+	var str string
+	if err := json.Unmarshal(data, &str); err != nil {
+		return err
+	}
+	if len(str) != 1 {
+		return fmt.Errorf("invalid status: %q", str)
+	}
+	*s = Status(str[0])
+	return nil
+}
+
 type Priority int
 
 const (
@@ -27,31 +46,153 @@ const (
 
 type Task struct {
 	// Identity
-	UUID uuid.UUID
+	UUID uuid.UUID `json:"uuid"`
-	ID   int
+	ID   int       `json:"id"`
 
 	// Core fields
-	Status      Status
+	Status      Status   `json:"status"`
-	Description string
+	Description string   `json:"description"`
-	Project     *string
+	Project     *string  `json:"project"`
-	Priority    Priority
+	Priority    Priority `json:"priority"`
 
 	// Timestamps
-	Created   time.Time
+	Created   time.Time  `json:"created"`
-	Modified  time.Time
+	Modified  time.Time  `json:"modified"`
-	Start     *time.Time
+	Start     *time.Time `json:"start,omitempty"`
-	End       *time.Time
+	End       *time.Time `json:"end,omitempty"`
-	Due       *time.Time
+	Due       *time.Time `json:"due,omitempty"`
-	Scheduled *time.Time
+	Scheduled *time.Time `json:"scheduled,omitempty"`
-	Wait      *time.Time
+	Wait      *time.Time `json:"wait,omitempty"`
-	Until     *time.Time
+	Until     *time.Time `json:"until,omitempty"`
 
 	// Recurrence (parent-child approach)
-	RecurrenceDuration *time.Duration
+	RecurrenceDuration *time.Duration `json:"recurrence_duration,omitempty"`
-	ParentUUID         *uuid.UUID
+	ParentUUID         *uuid.UUID     `json:"parent_uuid,omitempty"`
 
 	// Derived fields (not stored in DB)
-	Tags []string
+	Tags    []string `json:"tags"`
+	Urgency float64  `json:"urgency"`
+}
+
+// MarshalJSON emits Task with unix timestamps (int64) instead of RFC3339 strings.
+func (t Task) MarshalJSON() ([]byte, error) {
+	type taskJSON struct {
+		UUID               uuid.UUID  `json:"uuid"`
+		ID                 int        `json:"id"`
+		Status             Status     `json:"status"`
+		Description        string     `json:"description"`
+		Project            *string    `json:"project"`
+		Priority           Priority   `json:"priority"`
+		Created            int64      `json:"created"`
+		Modified           int64      `json:"modified"`
+		Start              *int64     `json:"start,omitempty"`
+		End                *int64     `json:"end,omitempty"`
+		Due                *int64     `json:"due,omitempty"`
+		Scheduled          *int64     `json:"scheduled,omitempty"`
+		Wait               *int64     `json:"wait,omitempty"`
+		Until              *int64     `json:"until,omitempty"`
+		RecurrenceDuration *int64     `json:"recurrence_duration,omitempty"`
+		ParentUUID         *uuid.UUID `json:"parent_uuid,omitempty"`
+		Tags               []string   `json:"tags"`
+		Urgency            float64    `json:"urgency"`
+	}
+
+	toUnix := func(tp *time.Time) *int64 {
+		if tp == nil {
+			return nil
+		}
+		v := tp.Unix()
+		return &v
+	}
+
+	var recurDur *int64
+	if t.RecurrenceDuration != nil {
+		v := int64(*t.RecurrenceDuration / time.Second)
+		recurDur = &v
+	}
+
+	return json.Marshal(taskJSON{
+		UUID:               t.UUID,
+		ID:                 t.ID,
+		Status:             t.Status,
+		Description:        t.Description,
+		Project:            t.Project,
+		Priority:           t.Priority,
+		Created:            t.Created.Unix(),
+		Modified:           t.Modified.Unix(),
+		Start:              toUnix(t.Start),
+		End:                toUnix(t.End),
+		Due:                toUnix(t.Due),
+		Scheduled:          toUnix(t.Scheduled),
+		Wait:               toUnix(t.Wait),
+		Until:              toUnix(t.Until),
+		RecurrenceDuration: recurDur,
+		ParentUUID:         t.ParentUUID,
+		Tags:               t.Tags,
+		Urgency:            t.Urgency,
+	})
+}
+
+// UnmarshalJSON parses Task from JSON with unix timestamps (int64) and duration in seconds.
+func (t *Task) UnmarshalJSON(data []byte) error {
+	type taskJSON struct {
+		UUID               uuid.UUID  `json:"uuid"`
+		ID                 int        `json:"id"`
+		Status             Status     `json:"status"`
+		Description        string     `json:"description"`
+		Project            *string    `json:"project"`
+		Priority           Priority   `json:"priority"`
+		Created            int64      `json:"created"`
+		Modified           int64      `json:"modified"`
+		Start              *int64     `json:"start,omitempty"`
+		End                *int64     `json:"end,omitempty"`
+		Due                *int64     `json:"due,omitempty"`
+		Scheduled          *int64     `json:"scheduled,omitempty"`
+		Wait               *int64     `json:"wait,omitempty"`
+		Until              *int64     `json:"until,omitempty"`
+		RecurrenceDuration *int64     `json:"recurrence_duration,omitempty"`
+		ParentUUID         *uuid.UUID `json:"parent_uuid,omitempty"`
+		Tags               []string   `json:"tags"`
+		Urgency            float64    `json:"urgency"`
+	}
+
+	var raw taskJSON
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return err
+	}
+
+	fromUnix := func(v *int64) *time.Time {
+		if v == nil {
+			return nil
+		}
+		t := time.Unix(*v, 0)
+		return &t
+	}
+
+	t.UUID = raw.UUID
+	t.ID = raw.ID
+	t.Status = raw.Status
+	t.Description = raw.Description
+	t.Project = raw.Project
+	t.Priority = raw.Priority
+	t.Created = time.Unix(raw.Created, 0)
+	t.Modified = time.Unix(raw.Modified, 0)
+	t.Start = fromUnix(raw.Start)
+	t.End = fromUnix(raw.End)
+	t.Due = fromUnix(raw.Due)
+	t.Scheduled = fromUnix(raw.Scheduled)
+	t.Wait = fromUnix(raw.Wait)
+	t.Until = fromUnix(raw.Until)
+	t.ParentUUID = raw.ParentUUID
+	t.Tags = raw.Tags
+	t.Urgency = raw.Urgency
+
+	if raw.RecurrenceDuration != nil {
+		d := time.Duration(*raw.RecurrenceDuration) * time.Second
+		t.RecurrenceDuration = &d
+	}
+
+	return nil
 }
 
 // timeNow returns current time (allows mocking in tests)
@@ -622,3 +763,12 @@ func (t *Task) IsRecurringTemplate() bool {
 func (t *Task) IsRecurringInstance() bool {
 	return t.ParentUUID != nil
 }
+
+// PopulateUrgency computes and sets the Urgency field on the given tasks.
+func PopulateUrgency(tasks ...*Task) {
+	cfg, _ := GetConfig()
+	coeffs := BuildUrgencyCoefficients(cfg)
+	for _, t := range tasks {
+		t.Urgency = t.CalculateUrgency(coeffs)
+	}
+}

opal-web/docs/design/api-serialization-and-urgency.md

@@ -0,0 +1,255 @@
+# API Serialization Fix & Urgency Field
+
+## Problem
+
+Two issues block showing urgency scores in the web frontend:
+
+1. **The Task struct has no JSON tags.** Go defaults to PascalCase field names
+   (`Description`, `ParentUUID`, `RecurrenceDuration`), but the frontend expects
+   snake_case (`description`, `parent_uuid`, `recurrence_duration`). There is no
+   transformation layer on either side — the frontend code works today only
+   because single-word fields like `description`/`Description` are
+   case-insensitive in JavaScript property access... actually they're not.
+   **This is a latent bug** — any field with multiple words
+   (`RecurrenceDuration`, `ParentUUID`) is broken in production.
+
+2. **Urgency is computed but never exposed.** The report engine calculates
+   urgency internally for sorting (`sortByUrgency` in `report.go`) but discards
+   the score before serialization. The `Task` struct has no urgency field.
+
+### Secondary issue: `time.Time` serialization
+
+Go's `time.Time` marshals as RFC3339 strings (`"2026-02-15T10:30:00Z"`), but the
+frontend expects unix timestamps (numbers). The `Status` type (`byte`) marshals
+as an integer (80 for `'P'`), but the frontend expects a string character
+(`"P"`). These need explicit handling.
+
+---
+
+## Scope
+
+### Backend (`opal-task`)
+
+#### 1. Add json tags to `engine.Task`
+
+File: `internal/engine/task.go`
+
+```go
+type Task struct {
+    UUID               uuid.UUID      `json:"uuid"`
+    ID                 int            `json:"id"`
+    Status             Status         `json:"status"`
+    Description        string         `json:"description"`
+    Project            *string        `json:"project"`
+    Priority           Priority       `json:"priority"`
+    Created            time.Time      `json:"created"`
+    Modified           time.Time      `json:"modified"`
+    Start              *time.Time     `json:"start,omitempty"`
+    End                *time.Time     `json:"end,omitempty"`
+    Due                *time.Time     `json:"due,omitempty"`
+    Scheduled          *time.Time     `json:"scheduled,omitempty"`
+    Wait               *time.Time     `json:"wait,omitempty"`
+    Until              *time.Time     `json:"until,omitempty"`
+    RecurrenceDuration *time.Duration `json:"recurrence_duration,omitempty"`
+    ParentUUID         *uuid.UUID     `json:"parent_uuid,omitempty"`
+    Tags               []string       `json:"tags"`
+    Urgency            float64        `json:"urgency"`
+}
+```
+
+#### 2. Custom JSON marshaling for `Status` and timestamps
+
+`Status` is a `byte` — it will serialize as `80` not `"P"`. Add a
+`MarshalJSON`/`UnmarshalJSON` pair on `Status` to emit a single-character
+string.
+
+For `time.Time`, the cleanest approach is a custom `MarshalJSON` on `Task` that
+emits unix timestamps for all time fields. This matches the existing frontend
+expectation and avoids date-parsing complexity in the browser.
+
+```go
+// On Status type
+func (s Status) MarshalJSON() ([]byte, error) {
+    return json.Marshal(string(s))
+}
+
+func (s *Status) UnmarshalJSON(data []byte) error {
+    var str string
+    if err := json.Unmarshal(data, &str); err != nil {
+        return err
+    }
+    if len(str) != 1 {
+        return fmt.Errorf("invalid status: %q", str)
+    }
+    *s = Status(str[0])
+    return nil
+}
+```
+
+For timestamps, implement `MarshalJSON` and `UnmarshalJSON` on `Task` that
+convert between `time.Time` and unix seconds (int64). Nullable time fields
+become `null` or the unix value. `RecurrenceDuration` (a `time.Duration`, stored
+internally as nanoseconds) must also be converted to seconds for consistency —
+the API uses seconds as its universal time unit. The symmetric pair ensures
+`json.Unmarshal` into a `Task` works correctly (for sync, tests,
+client-to-client), not just the handler request structs.
+
+#### 3. Populate urgency before returning
+
+**Where:** Centralize in a helper that handlers call before responding.
+
+```go
+// In a new file or in task.go
+func PopulateUrgency(tasks ...*Task) {
+    cfg, _ := GetConfig()
+    coeffs := BuildUrgencyCoefficients(cfg)
+    for _, t := range tasks {
+        t.Urgency = t.CalculateUrgency(coeffs)
+    }
+}
+```
+
+**Call sites** — every handler in `handlers/tasks.go` that returns task(s):
+
+| Handler        | Returns   |
+|----------------|-----------|
+| `ListTasks`    | `[]*Task` |
+| `CreateTask`   | `*Task`   |
+| `GetTask`      | `*Task`   |
+| `UpdateTask`   | `*Task`   |
+| `CompleteTask` | `*Task`   |
+| `StartTask`    | `*Task`   |
+| `StopTask`     | `*Task`   |
+| `AddTaskTag`   | `*Task`   |
+| `RemoveTaskTag`| `*Task`   |
+| `ParseTask`    | `*Task`   |
+
+The report path (`ListTasks` with `?report=`) already sorts by urgency via
+`sortByUrgency` — it should also populate the field so the score is in the
+response. Currently urgency is calculated, used for sorting, then thrown away.
+
+#### 4. Update tests
+
+`handlers/tasks_test.go` currently asserts PascalCase keys
+(`task["Description"]`). Update to snake_case (`task["description"]`). Add
+assertions for `urgency` field presence and that it's a number.
+
+---
+
+### Frontend (`opal-web`)
+
+#### 5. Add `urgency` to Task type
+
+File: `src/lib/api/types.js`
+
+```javascript
+/**
+ * @typedef {Object} Task
+ * ...existing fields...
+ * @property {number} urgency
+ */
+```
+
+#### 6. Display urgency in TaskItem
+
+File: `src/lib/components/TaskItem.svelte`
+
+Show the urgency score as a small numeric badge in the task metadata row.
+Render it as a one-decimal float (e.g. `8.2`) with color coding:
+
+| Range    | Meaning     | Color                          |
+|----------|-------------|--------------------------------|
+| >= 10    | Critical    | `--color-priority-high-text`   |
+| >= 5     | High        | `--color-priority-medium-text` |
+| > 0      | Normal      | `--text-secondary`             |
+| 0        | None        | Don't render                   |
+
+Position: rightmost item in the meta row, right-aligned. Use a monospace or
+tabular-nums font variant so scores don't cause layout shift.
+
+#### 7. Update mock data
+
+File: `src/lib/mock/tasks.js`
+
+Add `urgency` field to mock tasks with representative values so mock mode
+continues to work.
+
+---
+
+## Technical Decisions
+
+### ADR-7: JSON tags with snake_case convention
+
+**Context:** The Go Task struct has no json tags. PascalCase default breaks
+multi-word fields in the frontend.
+
+**Decision:** Add explicit `json:"snake_case"` tags to all Task fields.
+
+**Alternatives:**
+- Frontend transformation layer (rejected — masks the real problem, adds runtime
+  overhead, easy to forget when adding new fields)
+- Middleware that converts all response keys (rejected — fragile, doesn't handle
+  nested types, hides the contract)
+
+**Consequences:** Breaking change to API response shape for any existing
+consumers. Since the web frontend is the only consumer and its types already
+expect snake_case, this is actually a **fix** not a break.
+
+### ADR-8: Custom MarshalJSON for unix timestamps
+
+**Context:** `time.Time` marshals as RFC3339 strings, frontend expects unix ints.
+
+**Decision:** Implement `MarshalJSON` on `Task` that emits unix seconds for all
+time fields and string for Status.
+
+**Alternatives:**
+- Use a custom `UnixTime` type wrapper (rejected — too invasive, changes every
+  function that touches time fields)
+- Parse RFC3339 in the frontend (rejected — adds complexity to every consumer,
+  breaks existing date math that assumes unix seconds)
+
+**Consequences:** Time values in API responses are plain integers (seconds).
+Nullable times are `null`. `recurrence_duration` is also seconds (not
+nanoseconds) — a 1-week recurrence is `604800`, not `604800000000000`. Simple to
+consume in any language.
+
+### ADR-9: Urgency as a derived field on Task struct
+
+**Context:** Urgency is computed from task attributes + config coefficients. It's
+used for sorting in reports but never exposed to consumers.
+
+**Decision:** Add `Urgency float64` to the Task struct alongside `Tags` (both
+are derived/computed, not stored in DB). Populate via a `PopulateUrgency` helper
+called in handlers before serialization.
+
+**Alternatives:**
+- Separate response wrapper struct (rejected — duplicates the entire type for one
+  field, adds mapping boilerplate in every handler)
+- Compute client-side (rejected — requires shipping coefficient config to the
+  frontend, duplicates complex calculation logic)
+
+**Consequences:** Every API response that includes tasks will have urgency
+scores. The score is a snapshot at response time — it may drift slightly from
+what the sort order used if computed at different moments, but this is negligible.
+
+---
+
+## File Change Summary
+
+```
+opal-task/
+  internal/engine/
+    task.go .............. ADD json tags, ADD Urgency field, ADD MarshalJSON
+                           ADD PopulateUrgency helper
+    urgency.go ........... No changes
+    report.go ............ Populate urgency after sort (in sortByUrgency or Execute)
+  internal/api/handlers/
+    tasks.go ............. Call PopulateUrgency before jsonResponse in all handlers
+    tasks_test.go ........ Update key assertions to snake_case, add urgency checks
+
+opal-web/
+  src/lib/api/types.js ... ADD urgency field to Task typedef
+  src/lib/components/
+    TaskItem.svelte ...... ADD urgency badge to meta row
+  src/lib/mock/tasks.js .. ADD urgency values to mock data
+```

opal-web/src/lib/api/types.js

@@ -27,6 +27,7 @@
  * @property {number|null} recurrence_duration
  * @property {string|null} parent_uuid
  * @property {string[]} tags
+ * @property {number} urgency
  */
 
 /**

opal-web/src/lib/components/Header.svelte

@@ -1,6 +1,5 @@
 <script>
 	import ReportPicker from './ReportPicker.svelte';
-	import ThemeSwitcher from './ThemeSwitcher.svelte';
 
 	/**
 	 * @type {string}
@@ -45,7 +44,6 @@
 	</button>
 
 	<div class="header-actions">
-	<ThemeSwitcher mode="cycle" />
 	<a href="/settings" class="settings-btn" aria-label="Settings">
 		<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
 			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M10.325 4.317c.426-1.756 2.924-1.756 3.35 0a1.724 1.724 0 002.573 1.066c1.543-.94 3.31.826 2.37 2.37a1.724 1.724 0 001.065 2.572c1.756.426 1.756 2.924 0 3.35a1.724 1.724 0 00-1.066 2.573c.94 1.543-.826 3.31-2.37 2.37a1.724 1.724 0 00-2.572 1.065c-.426 1.756-2.924 1.756-3.35 0a1.724 1.724 0 00-2.573-1.066c-1.543.94-3.31-.826-2.37-2.37a1.724 1.724 0 00-1.065-2.572c-1.756-.426-1.756-2.924 0-3.35a1.724 1.724 0 001.066-2.573c-.94-1.543.826-3.31 2.37-2.37.996.608 2.296.07 2.572-1.065z" />
@@ -63,16 +61,17 @@
 
 <style>
 	.header {
+		grid-area: header;
 		display: flex;
 		align-items: center;
 		justify-content: space-between;
 		padding: var(--spacing-sm) var(--spacing-md);
 		background-color: var(--bg-primary);
 		border-bottom: 1px solid var(--border-color);
-		flex-shrink: 0;
 	}
 
 	.report-btn {
+		anchor-name: --report-btn;
 		display: inline-flex;
 		align-items: center;
 		gap: var(--spacing-xs);

opal-web/src/lib/components/InputBar.svelte

@@ -119,7 +119,7 @@
 
 <style>
 	.input-bar {
-		flex-shrink: 0;
+		grid-area: input;
 		padding: var(--spacing-sm) var(--spacing-md);
 		padding-bottom: calc(var(--spacing-sm) + env(safe-area-inset-bottom, 0px));
 		background-color: var(--bg-primary);

opal-web/src/lib/components/PropertyPills.svelte

@@ -7,14 +7,14 @@
 	export let visible = false;
 
 	const pills = [
-		{ label: 'Due', text: 'due:' },
+		{ label: "Due", text: "due:" },
-		{ label: 'Pri', text: 'priority:' },
+		{ label: "Pri", text: "priority:" },
-		{ label: 'Project', text: 'project:' },
+		{ label: "Project", text: "project:" },
-		{ label: 'Tag', text: '+' },
+		{ label: "Tag", text: "+" },
-		{ label: 'Recur', text: 'recur:' },
+		{ label: "Recur", text: "recur:" },
-		{ label: 'Scheduled', text: 'scheduled:' },
+		{ label: "Scheduled", text: "scheduled:" },
-		{ label: 'Wait', text: 'wait:' },
+		{ label: "Wait", text: "wait:" },
-		{ label: 'Until', text: 'until:' }
+		{ label: "Until", text: "until:" },
 	];
 </script>
 
@@ -41,11 +41,11 @@
 	}
 
 	.pill {
-		padding: 0.25rem 0.625rem;
+		padding: 0.375rem 0.75rem;
 		background-color: var(--bg-tertiary);
 		border: 1px solid var(--border-color);
 		border-radius: 1rem;
-		font-size: var(--font-size-xs);
+		font-size: var(--font-size-s);
 		font-family: inherit;
 		color: var(--text-secondary);
 		cursor: pointer;

opal-web/src/lib/components/ReportPicker.svelte

@@ -83,9 +83,8 @@
 <style>
 	.report-picker {
 		position: fixed;
-		top: 48px;
+		position-anchor: --report-btn;
-		left: var(--spacing-md);
+		position-area: bottom span-right;
-		right: auto;
 		margin: 0;
 		padding: var(--spacing-sm);
 		background-color: var(--bg-primary);

opal-web/src/lib/components/SwipeAction.svelte

@@ -51,7 +51,7 @@
 		}
 
 		if (swiping) {
-			e.preventDefault();
+			if (e.cancelable) e.preventDefault();
 			// Only allow right swipe
 			offsetX = Math.max(0, deltaX);
 		}

opal-web/src/lib/components/TaskItem.svelte

@@ -73,6 +73,16 @@
 						{/each}
 					</div>
 				{/if}
+
+				{#if task.urgency > 0}
+					<span class="meta-item urgency"
+						class:urgency-critical={task.urgency >= 10}
+						class:urgency-high={task.urgency >= 5 && task.urgency < 10}
+						class:urgency-normal={task.urgency > 0 && task.urgency < 5}
+					>
+						{task.urgency.toFixed(1)}
+					</span>
+				{/if}
 			</div>
 		</div>
 	</div>
@@ -196,4 +206,21 @@
 		color: var(--color-tag-text);
 		border-radius: 0.25rem;
 	}
+
+	.urgency {
+		margin-left: auto;
+		font-variant-numeric: tabular-nums;
+	}
+
+	.urgency-critical {
+		color: var(--color-priority-high-text);
+	}
+
+	.urgency-high {
+		color: var(--color-priority-medium-text);
+	}
+
+	.urgency-normal {
+		color: var(--text-secondary);
+	}
 </style>

opal-web/src/lib/components/TaskList.svelte

@@ -57,10 +57,11 @@
 
 <style>
 	.task-list {
-		flex: 1;
+		grid-area: content;
 		overflow-y: auto;
 		-webkit-overflow-scrolling: touch;
 		background-color: var(--bg-primary);
+		min-height: 0;
 	}
 
 	.loading-container {

opal-web/src/lib/mock/tasks.js

@@ -27,7 +27,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['devops', 'selfhosted']
+		tags: ['devops', 'selfhosted'],
+		urgency: 14.2
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111102',
@@ -46,7 +47,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['testing', 'backend']
+		tags: ['testing', 'backend'],
+		urgency: 7.3
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111103',
@@ -65,7 +67,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['bug']
+		tags: ['bug'],
+		urgency: 4.1
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111104',
@@ -84,7 +87,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['errand']
+		tags: ['errand'],
+		urgency: 3.5
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111105',
@@ -103,7 +107,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['frontend', 'design']
+		tags: ['frontend', 'design'],
+		urgency: 15.8
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111106',
@@ -122,7 +127,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['admin']
+		tags: ['admin'],
+		urgency: 2.4
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111107',
@@ -141,7 +147,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['frontend']
+		tags: ['frontend'],
+		urgency: 2.9
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111108',
@@ -160,7 +167,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['selfhosted', 'maintenance']
+		tags: ['selfhosted', 'maintenance'],
+		urgency: 1.6
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111109',
@@ -179,7 +187,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['reading', 'learning']
+		tags: ['reading', 'learning'],
+		urgency: 1.2
 	},
 	{
 		uuid: '11111111-1111-4111-a111-111111111110',
@@ -198,7 +207,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['review', 'backend']
+		tags: ['review', 'backend'],
+		urgency: 10.5
 	},
 
 	// ── Completed tasks ──────────────────────────────────────────
@@ -219,7 +229,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['backend', 'refactor']
+		tags: ['backend', 'refactor'],
+		urgency: 0
 	},
 	{
 		uuid: '22222222-2222-4222-a222-222222222202',
@@ -238,7 +249,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['auth', 'selfhosted']
+		tags: ['auth', 'selfhosted'],
+		urgency: 0
 	},
 	{
 		uuid: '22222222-2222-4222-a222-222222222203',
@@ -257,7 +269,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['ux', 'backend']
+		tags: ['ux', 'backend'],
+		urgency: 0
 	},
 	{
 		uuid: '22222222-2222-4222-a222-222222222204',
@@ -276,7 +289,8 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['bug', 'backend']
+		tags: ['bug', 'backend'],
+		urgency: 0
 	},
 	{
 		uuid: '22222222-2222-4222-a222-222222222205',
@@ -295,6 +309,7 @@ export const mockTasks = [
 		until: null,
 		recurrence_duration: null,
 		parent_uuid: null,
-		tags: ['docs']
+		tags: ['docs'],
+		urgency: 0
 	}
 ];

opal-web/src/routes/+layout.svelte

@@ -27,8 +27,13 @@
 <style>
 	.app {
 		height: 100dvh;
-		display: flex;
+		display: grid;
-		flex-direction: column;
+		grid-template-columns: 1fr min(var(--content-max-width), 100%) 1fr;
+		grid-template-rows: auto 1fr auto;
+		grid-template-areas:
+			". header ."
+			". content ."
+			". input .";
 		overflow: hidden;
 	}
 </style>

opal-web/src/routes/settings/+page.svelte

@@ -74,107 +74,112 @@
 	}
 </script>
 
-<div class="page">
+<header class="settings-header">
-	<div class="container">
+	<a href="/" class="back-link" aria-label="Back to tasks">
-		<div class="page-header">
+		<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
-			<a href="/" class="back-link" aria-label="Back to tasks">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
-				<svg class="back-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+		</svg>
-					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 19l-7-7 7-7" />
+	</a>
-				</svg>
+	<h1>Settings</h1>
-			</a>
+	{#if $authStore.isAuthenticated}
-			<h1>Settings</h1>
+		<button class="signout-btn" on:click={logout} aria-label="Sign out">
-		</div>
+			<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+				<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M17 16l4-4m0 0l-4-4m4 4H7m6 4v1a3 3 0 01-3 3H6a3 3 0 01-3-3V7a3 3 0 013-3h4a3 3 0 013 3v1" />
+			</svg>
+		</button>
+	{/if}
+</header>
 
+<div class="settings-content">
+	<section class="section">
+		<h2>Theme</h2>
+		<ThemeSwitcher mode="full" />
+	</section>
+
+	{#if $authStore.isAuthenticated}
 		<section class="section">
-			<h2>Theme</h2>
+			<h2>Account</h2>
-			<ThemeSwitcher mode="full" />
+			<div class="info-row">
+				<span class="label">Username:</span>
+				<span class="value">{$authStore.user?.username || 'Unknown'}</span>
+			</div>
+			{#if $authStore.user?.email}
+				<div class="info-row">
+					<span class="label">Email:</span>
+					<span class="value">{$authStore.user.email}</span>
+				</div>
+			{/if}
 		</section>
 
-		{#if $authStore.isAuthenticated}
+		<section class="section">
-			<section class="section">
+			<h2>Sync</h2>
-				<h2>Account</h2>
+			<div class="info-row">
+				<span class="label">Status:</span>
+				<span class="value">{$syncStore.status}</span>
+			</div>
+			<div class="info-row">
+				<span class="label">Queue:</span>
+				<span class="value">{$syncStore.queueSize} changes</span>
+			</div>
+			{#if $syncStore.lastSync}
 				<div class="info-row">
-					<span class="label">Username:</span>
+					<span class="label">Last Sync:</span>
-					<span class="value">{$authStore.user?.username || 'Unknown'}</span>
+					<span class="value">{new Date($syncStore.lastSync * 1000).toLocaleString()}</span>
 				</div>
-				{#if $authStore.user?.email}
+			{/if}
-					<div class="info-row">
-						<span class="label">Email:</span>
-						<span class="value">{$authStore.user.email}</span>
-					</div>
-				{/if}
-			</section>
 
-			<section class="section">
+			<Button on:click={triggerSync} disabled={$syncStore.status === 'syncing'}>
-				<h2>Sync</h2>
+				{$syncStore.status === 'syncing' ? 'Syncing...' : 'Sync Now'}
-				<div class="info-row">
+			</Button>
-					<span class="label">Status:</span>
+		</section>
-					<span class="value">{$syncStore.status}</span>
+	{:else}
-				</div>
+		<section class="section">
-				<div class="info-row">
+			<h2>API Key Authentication</h2>
-					<span class="label">Queue:</span>
+			<p class="text-secondary mb-md">
-					<span class="value">{$syncStore.queueSize} changes</span>
+				For testing, you can authenticate with an API key. Generate a key using:
-				</div>
+				<code>opal server keygen --name "Web"</code>
-				{#if $syncStore.lastSync}
+			</p>
-					<div class="info-row">
-						<span class="label">Last Sync:</span>
-						<span class="value">{new Date($syncStore.lastSync * 1000).toLocaleString()}</span>
-					</div>
-				{/if}
 
-				<Button on:click={triggerSync} disabled={$syncStore.status === 'syncing'}>
+			<Input
-					{$syncStore.status === 'syncing' ? 'Syncing...' : 'Sync Now'}
+				label="API Key"
-				</Button>
+				type="password"
-			</section>
+				placeholder="oak_..."
+				bind:value={apiKey}
+				{error}
+			/>
 
-			<section class="section">
+			<Button
-				<h2>Actions</h2>
+				on:click={saveApiKey}
-				<Button variant="danger" on:click={logout}>Logout</Button>
+				loading={saving}
-			</section>
+				fullWidth
-		{:else}
+			>
-			<section class="section">
+				Save API Key
-				<h2>API Key Authentication</h2>
+			</Button>
-				<p class="text-secondary mb-md">
+
-					For testing, you can authenticate with an API key. Generate a key using:
+			<div class="mt-lg text-center">
-					<code>opal server keygen --name "Web"</code>
+				<p class="text-sm text-secondary">
+					Or <a href="/auth/login">login with OAuth</a>
 				</p>
-				
+			</div>
-				<Input
+		</section>
-					label="API Key"
+	{/if}
-					type="password"
-					placeholder="oak_..."
-					bind:value={apiKey}
-					{error}
-				/>
-				
-				<Button 
-					on:click={saveApiKey} 
-					loading={saving}
-					fullWidth
-				>
-					Save API Key
-				</Button>
-				
-				<div class="mt-lg text-center">
-					<p class="text-sm text-secondary">
-						Or <a href="/auth/login">login with OAuth</a>
-					</p>
-				</div>
-			</section>
-		{/if}
-	</div>
 </div>
 
 <style>
-	.page-header {
+	.settings-header {
+		grid-area: header;
 		display: flex;
 		align-items: center;
 		gap: var(--spacing-sm);
-		padding-top: var(--spacing-lg);
+		padding: var(--spacing-sm) var(--spacing-md);
-		margin-bottom: var(--spacing-md);
+		background-color: var(--bg-primary);
+		border-bottom: 1px solid var(--border-color);
 	}
 
-	.page-header h1 {
+	.settings-header h1 {
+		flex: 1;
+		font-size: var(--font-size-lg);
+		font-weight: 600;
 		margin-bottom: 0;
 	}
 
@@ -190,21 +195,48 @@
 	}
 
 	.back-link:hover {
-		background-color: var(--bg-tertiary);
+		background-color: var(--bg-secondary);
 		text-decoration: none;
 	}
 
-	.back-icon {
+	.signout-btn {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		width: 44px;
+		height: 44px;
+		background: none;
+		border: none;
+		border-radius: var(--border-radius);
+		color: var(--text-secondary);
+		cursor: pointer;
+		transition: background-color 0.2s;
+	}
+
+	.signout-btn:hover {
+		background-color: var(--bg-secondary);
+		color: var(--color-danger);
+	}
+
+	.icon {
 		width: 1.25rem;
 		height: 1.25rem;
 	}
 
-	.section {
+	.settings-content {
+		grid-area: content;
+		overflow-y: auto;
+		-webkit-overflow-scrolling: touch;
+		padding: var(--spacing-md);
+		min-height: 0;
 		background-color: var(--bg-primary);
+	}
+
+	.section {
+		background-color: var(--bg-secondary);
 		border-radius: var(--border-radius);
 		padding: var(--spacing-lg);
 		margin-bottom: var(--spacing-lg);
-		box-shadow: var(--shadow-sm);
 	}
 
 	.info-row {