feat(web): add InputBar and PropertyPills components

InputBar provides fixed-to-bottom text input with Enter to submit,
blur-delay (150ms) for pill interaction, and cursor-aware text
insertion. PropertyPills shows 8 modifier pills (Due, Pri, Project,
Tag, Recur, Scheduled, Wait, Until) on input focus.

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

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

@@ -0,0 +1,188 @@
+<script>
+	import PropertyPills from './PropertyPills.svelte';
+
+	/**
+	 * @type {(input: string) => void}
+	 */
+	export let onSubmit;
+
+	export let error = '';
+	export let loading = false;
+
+	let value = '';
+	let focused = false;
+
+	/** @type {HTMLInputElement|null} */
+	let inputEl = null;
+
+	/** @type {ReturnType<typeof setTimeout>|null} */
+	let blurTimer = null;
+
+	function handleSubmit() {
+		const trimmed = value.trim();
+		if (!trimmed || loading) return;
+		onSubmit(trimmed);
+		value = '';
+	}
+
+	/**
+	 * @param {KeyboardEvent} e
+	 */
+	function handleKeydown(e) {
+		if (e.key === 'Enter') {
+			e.preventDefault();
+			handleSubmit();
+		}
+	}
+
+	function handleFocus() {
+		if (blurTimer) {
+			clearTimeout(blurTimer);
+			blurTimer = null;
+		}
+		focused = true;
+	}
+
+	function handleBlur() {
+		blurTimer = setTimeout(() => {
+			focused = false;
+			blurTimer = null;
+		}, 150);
+	}
+
+	/**
+	 * Insert text at cursor position
+	 * @param {string} text
+	 */
+	function insertAtCursor(text) {
+		if (!inputEl) return;
+		const start = inputEl.selectionStart ?? value.length;
+		const end = inputEl.selectionEnd ?? value.length;
+
+		// Add leading space if cursor isn't at start and prev char isn't a space
+		const needsSpace = start > 0 && value[start - 1] !== ' ';
+		const insert = (needsSpace ? ' ' : '') + text;
+
+		value = value.slice(0, start) + insert + value.slice(end);
+
+		// Restore focus and cursor position after the inserted text
+		const newPos = start + insert.length;
+		requestAnimationFrame(() => {
+			if (inputEl) {
+				inputEl.focus();
+				inputEl.setSelectionRange(newPos, newPos);
+			}
+		});
+	}
+</script>
+
+<div class="input-bar">
+	<PropertyPills visible={focused} onInsert={insertAtCursor} />
+
+	{#if error}
+		<div class="error">{error}</div>
+	{/if}
+
+	<div class="input-row">
+		<input
+			bind:this={inputEl}
+			bind:value
+			on:keydown={handleKeydown}
+			on:focus={handleFocus}
+			on:blur={handleBlur}
+			type="text"
+			placeholder="Add task... (e.g. Buy milk due:tomorrow priority:H)"
+			disabled={loading}
+			class="input"
+		/>
+		<button
+			class="submit-btn"
+			on:click={handleSubmit}
+			disabled={!value.trim() || loading}
+			type="button"
+			aria-label="Add task"
+		>
+			{#if loading}
+				<span class="loading"></span>
+			{:else}
+				<svg class="icon" viewBox="0 0 24 24" fill="none" stroke="currentColor">
+					<path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 4v16m8-8H4" />
+				</svg>
+			{/if}
+		</button>
+	</div>
+</div>
+
+<style>
+	.input-bar {
+		flex-shrink: 0;
+		padding: var(--spacing-sm) var(--spacing-md);
+		padding-bottom: calc(var(--spacing-sm) + env(safe-area-inset-bottom, 0px));
+		background-color: var(--bg-primary);
+		border-top: 1px solid var(--border-color);
+	}
+
+	.input-row {
+		display: flex;
+		gap: var(--spacing-sm);
+		align-items: center;
+	}
+
+	.input {
+		flex: 1;
+		padding: var(--spacing-sm) var(--spacing-md);
+		border: 1px solid var(--border-color);
+		border-radius: var(--border-radius);
+		font-size: var(--font-size-base);
+		font-family: inherit;
+		background-color: var(--bg-secondary);
+		color: var(--text-primary);
+		min-width: 0;
+	}
+
+	.input::placeholder {
+		color: var(--text-tertiary);
+	}
+
+	.input:focus {
+		outline: none;
+		border-color: var(--color-primary);
+		box-shadow: 0 0 0 2px rgba(79, 70, 229, 0.15);
+	}
+
+	.submit-btn {
+		display: flex;
+		align-items: center;
+		justify-content: center;
+		width: 44px;
+		height: 44px;
+		background-color: var(--color-primary);
+		color: white;
+		border: none;
+		border-radius: var(--border-radius);
+		cursor: pointer;
+		flex-shrink: 0;
+		min-width: 44px;
+		transition: background-color 0.15s;
+	}
+
+	.submit-btn:hover:not(:disabled) {
+		background-color: var(--color-primary-dark);
+	}
+
+	.submit-btn:disabled {
+		opacity: 0.5;
+		cursor: not-allowed;
+	}
+
+	.icon {
+		width: 1.25rem;
+		height: 1.25rem;
+	}
+
+	.error {
+		padding: var(--spacing-xs) 0;
+		font-size: var(--font-size-sm);
+		color: var(--color-danger);
+	}
+</style>

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

@@ -0,0 +1,66 @@
+<script>
+	/**
+	 * @type {(text: string) => void}
+	 */
+	export let onInsert;
+
+	export let visible = false;
+
+	const pills = [
+		{ label: 'Due', text: 'due:' },
+		{ label: 'Pri', text: 'priority:' },
+		{ label: 'Project', text: 'project:' },
+		{ label: 'Tag', text: '+' },
+		{ label: 'Recur', text: 'recur:' },
+		{ label: 'Scheduled', text: 'scheduled:' },
+		{ label: 'Wait', text: 'wait:' },
+		{ label: 'Until', text: 'until:' }
+	];
+</script>
+
+{#if visible}
+	<div class="pills">
+		{#each pills as pill}
+			<button
+				class="pill"
+				type="button"
+				on:mousedown|preventDefault={() => onInsert(pill.text)}
+			>
+				{pill.label}
+			</button>
+		{/each}
+	</div>
+{/if}
+
+<style>
+	.pills {
+		display: flex;
+		flex-wrap: wrap;
+		gap: var(--spacing-xs);
+		padding: var(--spacing-xs) 0;
+	}
+
+	.pill {
+		padding: 0.25rem 0.625rem;
+		background-color: var(--bg-tertiary);
+		border: 1px solid var(--border-color);
+		border-radius: 1rem;
+		font-size: var(--font-size-xs);
+		font-family: inherit;
+		color: var(--text-secondary);
+		cursor: pointer;
+		min-height: 28px;
+		min-width: unset;
+		transition: background-color 0.15s;
+	}
+
+	.pill:hover {
+		background-color: var(--border-color);
+	}
+
+	.pill:active {
+		background-color: var(--color-primary);
+		color: white;
+		border-color: var(--color-primary);
+	}
+</style>