feat(frontend): add core UI components and pages

- Add global CSS with mobile-first styling and CSS custom properties
- Create base UI components: Button, Input, Checkbox, Select
- Add BottomNav component with icons for Tasks, Projects, Tags, Settings
- Update app layout to include BottomNav and auth handling
- Create Settings page with API key input and sync controls
- Create auth pages: /auth/login (OAuth) and /auth/callback
- Add placeholder pages for Projects and Tags
- Implement manual API key authentication for MVP testing
- Add logout functionality and user info display
- Support for safe-area-inset (mobile notches)

opal-web/src/app.css

@@ -0,0 +1,186 @@
+/* Global Styles - Mobile-First */
+
+:root {
+	/* Colors */
+	--color-primary: #4f46e5;
+	--color-primary-dark: #4338ca;
+	--color-secondary: #6b7280;
+	--color-success: #10b981;
+	--color-danger: #ef4444;
+	--color-warning: #f59e0b;
+	
+	/* Backgrounds */
+	--bg-primary: #ffffff;
+	--bg-secondary: #f9fafb;
+	--bg-tertiary: #f3f4f6;
+	
+	/* Text */
+	--text-primary: #111827;
+	--text-secondary: #6b7280;
+	--text-tertiary: #9ca3af;
+	
+	/* Borders */
+	--border-color: #e5e7eb;
+	--border-radius: 0.5rem;
+	
+	/* Spacing */
+	--spacing-xs: 0.25rem;
+	--spacing-sm: 0.5rem;
+	--spacing-md: 1rem;
+	--spacing-lg: 1.5rem;
+	--spacing-xl: 2rem;
+	
+	/* Typography */
+	--font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
+	--font-size-xs: 0.75rem;
+	--font-size-sm: 0.875rem;
+	--font-size-base: 1rem;
+	--font-size-lg: 1.125rem;
+	--font-size-xl: 1.25rem;
+	--font-size-2xl: 1.5rem;
+	
+	/* Layout */
+	--nav-height: 60px;
+	--content-max-width: 768px;
+	
+	/* Shadows */
+	--shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
+	--shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
+	--shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
+}
+
+/* Reset & Base */
+* {
+	margin: 0;
+	padding: 0;
+	box-sizing: border-box;
+}
+
+html {
+	font-family: var(--font-sans);
+	font-size: 16px;
+	line-height: 1.5;
+	-webkit-font-smoothing: antialiased;
+	-moz-osx-font-smoothing: grayscale;
+}
+
+body {
+	background-color: var(--bg-secondary);
+	color: var(--text-primary);
+	min-height: 100vh;
+	overflow-x: hidden;
+}
+
+/* Typography */
+h1 {
+	font-size: var(--font-size-2xl);
+	font-weight: 700;
+	line-height: 1.2;
+	margin-bottom: var(--spacing-md);
+}
+
+h2 {
+	font-size: var(--font-size-xl);
+	font-weight: 600;
+	line-height: 1.3;
+	margin-bottom: var(--spacing-sm);
+}
+
+h3 {
+	font-size: var(--font-size-lg);
+	font-weight: 600;
+	line-height: 1.4;
+	margin-bottom: var(--spacing-sm);
+}
+
+p {
+	margin-bottom: var(--spacing-md);
+}
+
+a {
+	color: var(--color-primary);
+	text-decoration: none;
+}
+
+a:hover {
+	text-decoration: underline;
+}
+
+/* Layout Helpers */
+.container {
+	max-width: var(--content-max-width);
+	margin: 0 auto;
+	padding: 0 var(--spacing-md);
+}
+
+.page {
+	min-height: calc(100vh - var(--nav-height));
+	padding-bottom: calc(var(--nav-height) + var(--spacing-md));
+}
+
+/* Utility Classes */
+.text-center {
+	text-align: center;
+}
+
+.text-sm {
+	font-size: var(--font-size-sm);
+}
+
+.text-secondary {
+	color: var(--text-secondary);
+}
+
+.mt-sm { margin-top: var(--spacing-sm); }
+.mt-md { margin-top: var(--spacing-md); }
+.mt-lg { margin-top: var(--spacing-lg); }
+.mb-sm { margin-bottom: var(--spacing-sm); }
+.mb-md { margin-bottom: var(--spacing-md); }
+.mb-lg { margin-bottom: var(--spacing-lg); }
+
+.hidden {
+	display: none;
+}
+
+/* Loading State */
+.loading {
+	display: inline-block;
+	width: 1rem;
+	height: 1rem;
+	border: 2px solid var(--color-primary);
+	border-radius: 50%;
+	border-top-color: transparent;
+	animation: spin 0.6s linear infinite;
+}
+
+@keyframes spin {
+	to { transform: rotate(360deg); }
+}
+
+/* Touch Targets - Mobile First */
+button,
+a,
+input,
+select,
+textarea {
+	min-height: 44px;
+	min-width: 44px;
+}
+
+/* Focus Styles */
+:focus-visible {
+	outline: 2px solid var(--color-primary);
+	outline-offset: 2px;
+}
+
+/* Smooth Scrolling */
+html {
+	scroll-behavior: smooth;
+}
+
+/* Safe Area Padding (for mobile notches) */
+@supports (padding: env(safe-area-inset-bottom)) {
+	.page {
+		padding-bottom: calc(var(--nav-height) + var(--spacing-md) + env(safe-area-inset-bottom));
+	}
+}

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

@@ -0,0 +1,91 @@
+<script>
+	import { page } from '$app/stores';
+	
+	/**
+	 * @param {string} path
+	 * @returns {boolean}
+	 */
+	function isActive(path) {
+		return $page.url.pathname === path || $page.url.pathname.startsWith(path + '/');
+	}
+</script>
+
+<nav class="bottom-nav">
+	<a href="/" class="nav-item" class:active={$page.url.pathname === '/'}>
+		<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 5H7a2 2 0 00-2 2v12a2 2 0 002 2h10a2 2 0 002-2V7a2 2 0 00-2-2h-2M9 5a2 2 0 002 2h2a2 2 0 002-2M9 5a2 2 0 012-2h2a2 2 0 012 2" />
+		</svg>
+		<span class="label">Tasks</span>
+	</a>
+	
+	<a href="/projects" class="nav-item" class:active={isActive('/projects')}>
+		<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" />
+		</svg>
+		<span class="label">Projects</span>
+	</a>
+	
+	<a href="/tags" class="nav-item" class:active={isActive('/tags')}>
+		<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z" />
+		</svg>
+		<span class="label">Tags</span>
+	</a>
+	
+	<a href="/settings" class="nav-item" class:active={isActive('/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" />
+			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M15 12a3 3 0 11-6 0 3 3 0 016 0z" />
+		</svg>
+		<span class="label">Settings</span>
+	</a>
+</nav>
+
+<style>
+	.bottom-nav {
+		position: fixed;
+		bottom: 0;
+		left: 0;
+		right: 0;
+		height: var(--nav-height);
+		background-color: var(--bg-primary);
+		border-top: 1px solid var(--border-color);
+		display: flex;
+		justify-content: space-around;
+		align-items: center;
+		z-index: 100;
+		padding-bottom: env(safe-area-inset-bottom, 0);
+	}
+	
+	.nav-item {
+		display: flex;
+		flex-direction: column;
+		align-items: center;
+		justify-content: center;
+		gap: 0.25rem;
+		flex: 1;
+		height: 100%;
+		color: var(--text-secondary);
+		text-decoration: none;
+		transition: color 0.2s;
+		-webkit-tap-highlight-color: transparent;
+	}
+	
+	.nav-item:hover {
+		text-decoration: none;
+	}
+	
+	.nav-item.active {
+		color: var(--color-primary);
+	}
+	
+	.icon {
+		width: 1.5rem;
+		height: 1.5rem;
+	}
+	
+	.label {
+		font-size: var(--font-size-xs);
+		font-weight: 500;
+	}
+</style>

opal-web/src/lib/components/ui/Button.svelte

@@ -0,0 +1,115 @@
+<script>
+	/**
+	 * @type {'primary' | 'secondary' | 'danger' | 'ghost'}
+	 */
+	export let variant = 'primary';
+	
+	/**
+	 * @type {'sm' | 'md' | 'lg'}
+	 */
+	export let size = 'md';
+	
+	/**
+	 * @type {'button' | 'submit' | 'reset'}
+	 */
+	export let type = 'button';
+	export let disabled = false;
+	export let loading = false;
+	export let fullWidth = false;
+</script>
+
+<button
+	class="btn btn-{variant} btn-{size}"
+	class:btn-full={fullWidth}
+	class:btn-loading={loading}
+	{type}
+	{disabled}
+	on:click
+>
+	{#if loading}
+		<span class="loading"></span>
+	{/if}
+	<slot />
+</button>
+
+<style>
+	.btn {
+		display: inline-flex;
+		align-items: center;
+		justify-content: center;
+		gap: 0.5rem;
+		font-weight: 500;
+		border-radius: var(--border-radius);
+		border: none;
+		cursor: pointer;
+		transition: all 0.2s;
+		font-family: inherit;
+		white-space: nowrap;
+	}
+	
+	.btn:disabled {
+		opacity: 0.5;
+		cursor: not-allowed;
+	}
+	
+	/* Sizes */
+	.btn-sm {
+		padding: 0.25rem 0.75rem;
+		font-size: var(--font-size-sm);
+	}
+	
+	.btn-md {
+		padding: 0.5rem 1rem;
+		font-size: var(--font-size-base);
+	}
+	
+	.btn-lg {
+		padding: 0.75rem 1.5rem;
+		font-size: var(--font-size-lg);
+	}
+	
+	/* Variants */
+	.btn-primary {
+		background-color: var(--color-primary);
+		color: white;
+	}
+	
+	.btn-primary:hover:not(:disabled) {
+		background-color: var(--color-primary-dark);
+	}
+	
+	.btn-secondary {
+		background-color: var(--bg-tertiary);
+		color: var(--text-primary);
+	}
+	
+	.btn-secondary:hover:not(:disabled) {
+		background-color: var(--border-color);
+	}
+	
+	.btn-danger {
+		background-color: var(--color-danger);
+		color: white;
+	}
+	
+	.btn-danger:hover:not(:disabled) {
+		opacity: 0.9;
+	}
+	
+	.btn-ghost {
+		background-color: transparent;
+		color: var(--text-primary);
+	}
+	
+	.btn-ghost:hover:not(:disabled) {
+		background-color: var(--bg-tertiary);
+	}
+	
+	.btn-full {
+		width: 100%;
+	}
+	
+	.btn-loading {
+		pointer-events: none;
+	}
+</style>

opal-web/src/lib/components/ui/Checkbox.svelte

@@ -0,0 +1,86 @@
+<script>
+	export let checked = false;
+	export let label = '';
+	export let disabled = false;
+	export let id = '';
+</script>
+
+<label class="checkbox-container" class:disabled>
+	<input
+		{id}
+		type="checkbox"
+		bind:checked
+		{disabled}
+		class="checkbox"
+		on:change
+	/>
+	<span class="checkmark"></span>
+	{#if label}
+		<span class="label">{label}</span>
+	{/if}
+	<slot />
+</label>
+
+<style>
+	.checkbox-container {
+		display: flex;
+		align-items: center;
+		gap: 0.5rem;
+		cursor: pointer;
+		user-select: none;
+		position: relative;
+		padding-left: 1.75rem;
+		min-height: 44px;
+	}
+	
+	.checkbox-container.disabled {
+		opacity: 0.5;
+		cursor: not-allowed;
+	}
+	
+	.checkbox {
+		position: absolute;
+		opacity: 0;
+		cursor: pointer;
+		height: 0;
+		width: 0;
+	}
+	
+	.checkmark {
+		position: absolute;
+		left: 0;
+		height: 1.25rem;
+		width: 1.25rem;
+		background-color: var(--bg-primary);
+		border: 2px solid var(--border-color);
+		border-radius: 0.25rem;
+		transition: all 0.2s;
+	}
+	
+	.checkbox:checked ~ .checkmark {
+		background-color: var(--color-primary);
+		border-color: var(--color-primary);
+	}
+	
+	.checkmark:after {
+		content: "";
+		position: absolute;
+		display: none;
+		left: 0.375rem;
+		top: 0.125rem;
+		width: 0.375rem;
+		height: 0.625rem;
+		border: solid white;
+		border-width: 0 2px 2px 0;
+		transform: rotate(45deg);
+	}
+	
+	.checkbox:checked ~ .checkmark:after {
+		display: block;
+	}
+	
+	.label {
+		font-size: var(--font-size-base);
+		color: var(--text-primary);
+	}
+</style>

opal-web/src/lib/components/ui/Input.svelte

@@ -0,0 +1,87 @@
+<script>
+	export let type = 'text';
+	export let value = '';
+	export let placeholder = '';
+	export let label = '';
+	export let error = '';
+	export let disabled = false;
+	export let required = false;
+	export let id = '';
+</script>
+
+<div class="input-group">
+	{#if label}
+		<label for={id} class="label">
+			{label}
+			{#if required}<span class="required">*</span>{/if}
+		</label>
+	{/if}
+	
+	<input
+		{id}
+		{type}
+		{placeholder}
+		{disabled}
+		{required}
+		bind:value
+		class="input"
+		class:input-error={error}
+		on:input
+		on:change
+		on:blur
+	/>
+	
+	{#if error}
+		<span class="error-message">{error}</span>
+	{/if}
+</div>
+
+<style>
+	.input-group {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+		width: 100%;
+	}
+	
+	.label {
+		font-size: var(--font-size-sm);
+		font-weight: 500;
+		color: var(--text-primary);
+	}
+	
+	.required {
+		color: var(--color-danger);
+	}
+	
+	.input {
+		width: 100%;
+		padding: 0.75rem;
+		font-size: var(--font-size-base);
+		font-family: inherit;
+		border: 1px solid var(--border-color);
+		border-radius: var(--border-radius);
+		background-color: var(--bg-primary);
+		color: var(--text-primary);
+		transition: border-color 0.2s;
+	}
+	
+	.input:focus {
+		outline: none;
+		border-color: var(--color-primary);
+	}
+	
+	.input:disabled {
+		background-color: var(--bg-tertiary);
+		cursor: not-allowed;
+	}
+	
+	.input-error {
+		border-color: var(--color-danger);
+	}
+	
+	.error-message {
+		font-size: var(--font-size-sm);
+		color: var(--color-danger);
+	}
+</style>

opal-web/src/lib/components/ui/Select.svelte

@@ -0,0 +1,73 @@
+<script>
+	/**
+	 * @type {Array<{value: string, label: string}>}
+	 */
+	export let options = [];
+	export let value = '';
+	export let label = '';
+	export let placeholder = 'Select...';
+	export let disabled = false;
+	export let id = '';
+</script>
+
+<div class="select-group">
+	{#if label}
+		<label for={id} class="label">{label}</label>
+	{/if}
+	
+	<select
+		{id}
+		bind:value
+		{disabled}
+		class="select"
+		on:change
+	>
+		<option value="" disabled selected>{placeholder}</option>
+		{#each options as option}
+			<option value={option.value}>{option.label}</option>
+		{/each}
+	</select>
+</div>
+
+<style>
+	.select-group {
+		display: flex;
+		flex-direction: column;
+		gap: 0.25rem;
+		width: 100%;
+	}
+	
+	.label {
+		font-size: var(--font-size-sm);
+		font-weight: 500;
+		color: var(--text-primary);
+	}
+	
+	.select {
+		width: 100%;
+		padding: 0.75rem;
+		font-size: var(--font-size-base);
+		font-family: inherit;
+		border: 1px solid var(--border-color);
+		border-radius: var(--border-radius);
+		background-color: var(--bg-primary);
+		color: var(--text-primary);
+		cursor: pointer;
+		appearance: none;
+		background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236b7280'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
+		background-repeat: no-repeat;
+		background-position: right 0.5rem center;
+		background-size: 1.5rem;
+		padding-right: 2.5rem;
+	}
+	
+	.select:focus {
+		outline: none;
+		border-color: var(--color-primary);
+	}
+	
+	.select:disabled {
+		background-color: var(--bg-tertiary);
+		cursor: not-allowed;
+	}
+</style>

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

@@ -1,11 +1,32 @@
 <script>
-	import favicon from '$lib/assets/favicon.svg';
+	import '../app.css';
-
+	import BottomNav from '$lib/components/BottomNav.svelte';
-	let { children } = $props();
+	import { authStore } from '$lib/stores/auth.js';
+	import { page } from '$app/stores';
+	
+	// Check if on auth pages (don't show nav)
+	$: isAuthPage = $page.url.pathname.startsWith('/auth');
 </script>
 
-<svelte:head>
+<div class="app">
-	<link rel="icon" href={favicon} />
+	<main class="main">
-</svelte:head>
+		<slot />
+	</main>
+	
+	{#if $authStore.isAuthenticated && !isAuthPage}
+		<BottomNav />
+	{/if}
+</div>
 
-{@render children()}
+<style>
+	.app {
+		min-height: 100vh;
+		display: flex;
+		flex-direction: column;
+	}
+	
+	.main {
+		flex: 1;
+		width: 100%;
+	}
+</style>

opal-web/src/routes/auth/callback/+page.svelte

@@ -0,0 +1,83 @@
+<script>
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { page } from '$app/stores';
+	import { auth } from '$lib/api/endpoints.js';
+	import { authStore } from '$lib/stores/auth.js';
+	
+	let status = 'Processing...';
+	let error = '';
+	
+	onMount(async () => {
+		const code = $page.url.searchParams.get('code');
+		
+		if (!code) {
+			error = 'No authorization code received';
+			return;
+		}
+		
+		try {
+			const data = await auth.callback(code);
+			authStore.setAuth(data);
+			goto('/');
+		} catch (err) {
+			error = err instanceof Error ? err.message : 'Authentication failed';
+		}
+	});
+</script>
+
+<div class="page callback-page">
+	<div class="container">
+		<div class="callback-card">
+			{#if error}
+				<h1>Authentication Failed</h1>
+				<p class="error-message">{error}</p>
+				<a href="/auth/login" class="btn-link">Try Again</a>
+			{:else}
+				<div class="loading-spinner">
+					<div class="loading"></div>
+				</div>
+				<p class="text-center text-secondary">{status}</p>
+			{/if}
+		</div>
+	</div>
+</div>
+
+<style>
+	.callback-page {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		min-height: 100vh;
+	}
+	
+	.callback-card {
+		text-align: center;
+		max-width: 400px;
+	}
+	
+	.loading-spinner {
+		display: flex;
+		justify-content: center;
+		margin-bottom: var(--spacing-lg);
+	}
+	
+	.loading {
+		width: 3rem;
+		height: 3rem;
+	}
+	
+	.error-message {
+		color: var(--color-danger);
+		margin-bottom: var(--spacing-lg);
+	}
+	
+	.btn-link {
+		display: inline-block;
+		padding: 0.75rem 1.5rem;
+		background-color: var(--color-primary);
+		color: white;
+		border-radius: var(--border-radius);
+		text-decoration: none;
+	}
+</style>

opal-web/src/routes/auth/login/+page.svelte

@@ -0,0 +1,79 @@
+<script>
+	import { onMount } from 'svelte';
+	import { goto } from '$app/navigation';
+	import { auth } from '$lib/api/endpoints.js';
+	import Button from '$lib/components/ui/Button.svelte';
+	
+	let loading = false;
+	let error = '';
+	
+	async function loginWithOAuth() {
+		loading = true;
+		error = '';
+		
+		try {
+			const { url } = await auth.getLoginUrl();
+			window.location.href = url;
+		} catch (err) {
+			error = err instanceof Error ? err.message : 'Failed to get login URL';
+			loading = false;
+		}
+	}
+</script>
+
+<div class="page login-page">
+	<div class="container">
+		<div class="login-card">
+			<h1 class="text-center">Welcome to Opal</h1>
+			<p class="text-center text-secondary mb-lg">Mobile-first task management</p>
+			
+			{#if error}
+				<div class="error-banner">
+					{error}
+				</div>
+			{/if}
+			
+			<Button 
+				on:click={loginWithOAuth} 
+				loading={loading}
+				fullWidth
+				size="lg"
+			>
+				Login with OAuth
+			</Button>
+			
+			<div class="mt-lg text-center">
+				<p class="text-sm text-secondary">
+					Or use <a href="/settings">API Key authentication</a>
+				</p>
+			</div>
+		</div>
+	</div>
+</div>
+
+<style>
+	.login-page {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		min-height: 100vh;
+	}
+	
+	.login-card {
+		background-color: var(--bg-primary);
+		border-radius: var(--border-radius);
+		padding: var(--spacing-xl);
+		box-shadow: var(--shadow-lg);
+		max-width: 400px;
+		width: 100%;
+	}
+	
+	.error-banner {
+		background-color: #fee2e2;
+		color: var(--color-danger);
+		padding: var(--spacing-md);
+		border-radius: var(--border-radius);
+		margin-bottom: var(--spacing-md);
+		font-size: var(--font-size-sm);
+	}
+</style>

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

@@ -0,0 +1,6 @@
+<div class="page">
+	<div class="container">
+		<h1>Projects</h1>
+		<p class="text-secondary">Projects view coming soon...</p>
+	</div>
+</div>

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

@@ -0,0 +1,192 @@
+<script>
+	import { authStore } from '$lib/stores/auth.js';
+	import { syncStore } from '$lib/stores/sync.js';
+	import Button from '$lib/components/ui/Button.svelte';
+	import Input from '$lib/components/ui/Input.svelte';
+	import { auth } from '$lib/api/endpoints.js';
+	import { goto } from '$app/navigation';
+	
+	let apiKey = '';
+	let saving = false;
+	let error = '';
+	
+	/**
+	 * Save API key as manual auth
+	 */
+	async function saveApiKey() {
+		if (!apiKey.trim()) {
+			error = 'API key is required';
+			return;
+		}
+		
+		saving = true;
+		error = '';
+		
+		try {
+			// Store API key as access token (for manual auth mode)
+			authStore.setAuth({
+				access_token: apiKey,
+				refresh_token: '',
+				expires_at: 9999999999, // Far future
+				token_type: 'Bearer',
+				user: {
+					id: 1,
+					username: 'api-user',
+					email: null
+				}
+			});
+			
+			goto('/');
+		} catch (err) {
+			error = err instanceof Error ? err.message : 'Failed to save API key';
+		} finally {
+			saving = false;
+		}
+	}
+	
+	/**
+	 * Logout
+	 */
+	async function logout() {
+		if ($authStore.refreshToken) {
+			try {
+				await auth.logout($authStore.refreshToken);
+			} catch (err) {
+				console.error('Logout error:', err instanceof Error ? err.message : err);
+			}
+		}
+		
+		authStore.clear();
+		goto('/auth/login');
+	}
+	
+	/**
+	 * Trigger manual sync
+	 */
+	async function triggerSync() {
+		try {
+			await syncStore.sync();
+			alert('Sync completed successfully');
+		} catch (err) {
+			alert('Sync failed: ' + (err instanceof Error ? err.message : String(err)));
+		}
+	}
+</script>
+
+<div class="page">
+	<div class="container">
+		<h1>Settings</h1>
+		
+		{#if $authStore.isAuthenticated}
+			<section class="section">
+				<h2>Account</h2>
+				<div class="info-row">
+					<span class="label">Username:</span>
+					<span class="value">{$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>
+			
+			<section class="section">
+				<h2>Sync</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 $syncStore.lastSync}
+					<div class="info-row">
+						<span class="label">Last Sync:</span>
+						<span class="value">{new Date($syncStore.lastSync * 1000).toLocaleString()}</span>
+					</div>
+				{/if}
+				
+				<Button on:click={triggerSync} disabled={$syncStore.status === 'syncing'}>
+					{$syncStore.status === 'syncing' ? 'Syncing...' : 'Sync Now'}
+				</Button>
+			</section>
+			
+			<section class="section">
+				<h2>Actions</h2>
+				<Button variant="danger" on:click={logout}>Logout</Button>
+			</section>
+		{:else}
+			<section class="section">
+				<h2>API Key Authentication</h2>
+				<p class="text-secondary mb-md">
+					For testing, you can authenticate with an API key. Generate a key using:
+					<code>opal server keygen --name "Web"</code>
+				</p>
+				
+				<Input
+					label="API Key"
+					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>
+	.section {
+		background-color: var(--bg-primary);
+		border-radius: var(--border-radius);
+		padding: var(--spacing-lg);
+		margin-bottom: var(--spacing-lg);
+		box-shadow: var(--shadow-sm);
+	}
+	
+	.info-row {
+		display: flex;
+		justify-content: space-between;
+		align-items: center;
+		padding: var(--spacing-sm) 0;
+		border-bottom: 1px solid var(--border-color);
+	}
+	
+	.info-row:last-of-type {
+		border-bottom: none;
+	}
+	
+	.label {
+		font-weight: 500;
+		color: var(--text-secondary);
+	}
+	
+	.value {
+		color: var(--text-primary);
+	}
+	
+	code {
+		background-color: var(--bg-tertiary);
+		padding: 0.125rem 0.375rem;
+		border-radius: 0.25rem;
+		font-family: 'Courier New', monospace;
+		font-size: var(--font-size-sm);
+	}
+</style>

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

@@ -0,0 +1,6 @@
+<div class="page">
+	<div class="container">
+		<h1>Tags</h1>
+		<p class="text-secondary">Tags view coming soon...</p>
+	</div>
+</div>