feat: add TaskDetail, bidirectional swipe, and active indicator

- SwipeAction: bidirectional with onSwipeRight/onSwipeLeft, dual backgrounds
- TaskItem: onTap for bottom sheet, onStartStop, active border + pill
- TaskDetail: full field layout with inline editing, action buttons
- TaskList: passes onTap and onStartStop through to TaskItem

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

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

@@ -2,12 +2,23 @@
 	/**
 	 * @type {() => void}
 	 */
-	export let onSwipe;
+	export let onSwipeRight;
+
+	/**
+	 * @type {() => void}
+	 */
+	export let onSwipeLeft;
+
+	/**
+	 * @type {'start' | 'stop'}
+	 */
+	export let leftIcon;
 
 	let offsetX = 0;
 	let swiping = false;
 	let locked = false;
 	let completed = false;
+	let triggered = false;
 
 	/** @type {number|null} */
 	let startX = null;
@@ -52,8 +63,7 @@
 
 		if (swiping) {
 			if (e.cancelable) e.preventDefault();
-			// Only allow right swipe
-			offsetX = Math.max(0, deltaX);
+			offsetX = deltaX;
 		}
 	}
 
@@ -64,11 +74,20 @@
 		}
 
 		if (offsetX >= THRESHOLD) {
+			// Right swipe — complete (row collapses)
 			completed = true;
-			// Animate to full width before firing callback
 			offsetX = window.innerWidth;
 			setTimeout(() => {
-				onSwipe();
+				onSwipeRight();
+			}, 200);
+		} else if (offsetX <= -THRESHOLD) {
+			// Left swipe — start/stop (row stays)
+			triggered = true;
+			offsetX = -window.innerWidth;
+			setTimeout(() => {
+				onSwipeLeft();
+				offsetX = 0;
+				triggered = false;
 			}, 200);
 		} else {
 			offsetX = 0;
@@ -86,7 +105,8 @@
 		startY = null;
 	}
 
-	$: progress = Math.min(offsetX / THRESHOLD, 1);
+	$: rightProgress = offsetX > 0 ? Math.min(offsetX / THRESHOLD, 1) : 0;
+	$: leftProgress = offsetX < 0 ? Math.min(Math.abs(offsetX) / THRESHOLD, 1) : 0;
 	$: transitioning = !swiping && offsetX !== 0;
 </script>
 
@@ -97,15 +117,28 @@
 	on:touchend={handleTouchEnd}
 	on:touchcancel={resetState}
 >
-	<div
-		class="swipe-background"
-		style:opacity={progress}
-	>
-		<svg class="check-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+	<!-- Left background (revealed on RIGHT swipe — complete) -->
+	<div class="swipe-bg swipe-bg-right"
+		style:opacity={rightProgress}>
+		<svg class="swipe-icon check-icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
 			<path stroke-linecap="round" stroke-linejoin="round" stroke-width="3" d="M5 13l4 4L19 7" />
 		</svg>
 	</div>
 
+	<!-- Right background (revealed on LEFT swipe — start/stop) -->
+	<div class="swipe-bg swipe-bg-left"
+		style:opacity={leftProgress}>
+		{#if leftIcon === 'stop'}
+			<svg class="swipe-icon fill-icon" viewBox="0 0 24 24">
+				<rect x="6" y="6" width="12" height="12" rx="1" />
+			</svg>
+		{:else}
+			<svg class="swipe-icon fill-icon" viewBox="0 0 24 24">
+				<polygon points="6,4 20,12 6,20" />
+			</svg>
+		{/if}
+	</div>
+
 	<div
 		class="swipe-content"
 		class:transitioning
@@ -122,21 +155,44 @@
 		touch-action: pan-y;
 	}
 
-	.swipe-background {
+	.swipe-bg {
 		position: absolute;
 		inset: 0;
-		background-color: var(--color-success);
 		display: flex;
 		align-items: center;
-		padding-left: var(--spacing-lg);
 	}
 
-	.check-icon {
+	.swipe-bg-right {
+		background-color: var(--color-success);
+		padding-left: var(--spacing-lg);
+		justify-content: flex-start;
+	}
+
+	.swipe-bg-left {
+		background-color: var(--color-primary);
+		padding-right: var(--spacing-lg);
+		justify-content: flex-end;
+	}
+
+	.swipe-icon {
 		width: 1.5rem;
 		height: 1.5rem;
 		color: white;
 	}
 
+	.check-icon {
+		fill: none;
+		stroke: currentColor;
+		stroke-width: 3;
+		stroke-linecap: round;
+		stroke-linejoin: round;
+	}
+
+	.fill-icon {
+		fill: white;
+		stroke: none;
+	}
+
 	.swipe-content {
 		position: relative;
 		background-color: var(--bg-primary);

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

@@ -14,10 +14,21 @@
 	 */
 	export let onComplete;
 
+	/**
+	 * @type {(task: import('$lib/api/types.js').Task) => void}
+	 */
+	export let onTap;
+
+	/**
+	 * @type {(uuid: string) => void}
+	 */
+	export let onStartStop;
+
 	let completing = false;
 
 	$: overdue = task.due && isOverdue(task.due);
 	$: dueToday = task.due && isTodayFn(new Date(task.due * 1000));
+	$: active = task.start !== null && task.start !== undefined;
 
 	function handleCheckbox() {
 		if (completing) return;
@@ -34,13 +45,18 @@
 	}
 </script>
 
-<SwipeAction onSwipe={() => onComplete(task.uuid)}>
-	<div class="task-item" class:completing on:transitionend={handleTransitionEnd}>
+<SwipeAction
+	onSwipeRight={() => onComplete(task.uuid)}
+	onSwipeLeft={() => onStartStop(task.uuid)}
+	leftIcon={active ? 'stop' : 'start'}
+>
+	<div class="task-item" class:completing class:active on:transitionend={handleTransitionEnd}>
 		<button class="task-checkbox" on:click|stopPropagation={handleCheckbox} type="button" aria-label="Complete task">
 			<Checkbox checked={task.status === 'C'} />
 		</button>
 
-		<div class="task-content">
+		<!-- svelte-ignore a11y-click-events-have-key-events a11y-no-static-element-interactions -->
+		<div class="task-content" on:click={() => onTap(task)}>
 			<div class="task-header">
 				<span class="task-description" class:completed={task.status === 'C'}>
 					{task.description}
@@ -48,6 +64,10 @@
 			</div>
 
 			<div class="task-meta">
+				{#if active}
+					<span class="meta-item active-pill">Active</span>
+				{/if}
+
 				{#if task.project}
 					<span class="meta-item project">{task.project}</span>
 				{/if}
@@ -109,6 +129,11 @@
 		overflow: hidden;
 	}
 
+	.task-item.active {
+		border-left: 3px solid var(--color-primary);
+		padding-left: calc(var(--spacing-md) - 3px);
+	}
+
 	.task-checkbox {
 		flex-shrink: 0;
 		display: flex;
@@ -127,6 +152,7 @@
 	.task-content {
 		flex: 1;
 		min-width: 0;
+		cursor: pointer;
 	}
 
 	.task-header {
@@ -158,6 +184,11 @@
 		font-weight: 500;
 	}
 
+	.active-pill {
+		background-color: var(--color-active-bg);
+		color: var(--color-active-text);
+	}
+
 	.project {
 		background-color: var(--color-project-bg);
 		color: var(--color-project-text);

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

@@ -11,6 +11,16 @@
 	 */
 	export let onComplete;
 
+	/**
+	 * @type {(task: import('$lib/api/types.js').Task) => void}
+	 */
+	export let onTap;
+
+	/**
+	 * @type {(uuid: string) => void}
+	 */
+	export let onStartStop;
+
 	export let loading = false;
 	export let activeReport = 'list';
 
@@ -50,6 +60,8 @@
 			<TaskItem
 				{task}
 				{onComplete}
+				{onTap}
+				{onStartStop}
 			/>
 		{/each}
 	{/if}