feat(05-01): create SearchBar component with debounced input

- Debounced value binding (300ms delay via $effect cleanup)
- Only trigger search when query >= 2 chars OR cleared to empty
- Bindable value prop for parent integration
- '/' keyboard shortcut to focus search (GitHub-style)
- Native event listener to avoid Svelte 5 keydown bug

src/lib/components/SearchBar.svelte

@@ -0,0 +1,60 @@
+<script lang="ts">
+	import { onMount } from 'svelte';
+
+	interface Props {
+		value: string;
+	}
+
+	let { value = $bindable() }: Props = $props();
+
+	// Internal state for immediate user input
+	let inputValue = $state(value);
+	let searchInput: HTMLInputElement;
+
+	// Debounce: update bound value 300ms after user stops typing
+	$effect(() => {
+		const timeout = setTimeout(() => {
+			// Only trigger when >= 2 chars OR cleared to empty
+			if (inputValue.length >= 2 || inputValue.length === 0) {
+				value = inputValue;
+			}
+		}, 300);
+
+		return () => clearTimeout(timeout);
+	});
+
+	// Sync inputValue if parent changes value externally
+	$effect(() => {
+		if (value !== inputValue && (value === '' || inputValue === '')) {
+			inputValue = value;
+		}
+	});
+
+	// "/" keyboard shortcut - use native listener to avoid Svelte 5 bug
+	onMount(() => {
+		function handleKeydown(e: KeyboardEvent) {
+			// Skip if already in an input or textarea
+			if (e.target instanceof HTMLInputElement || e.target instanceof HTMLTextAreaElement) {
+				return;
+			}
+
+			if (e.key === '/') {
+				e.preventDefault();
+				searchInput?.focus();
+			}
+		}
+
+		document.addEventListener('keydown', handleKeydown);
+		return () => document.removeEventListener('keydown', handleKeydown);
+	});
+</script>
+
+<div class="relative">
+	<input
+		bind:this={searchInput}
+		bind:value={inputValue}
+		type="text"
+		placeholder='Search entries... (press "/")'
+		class="w-full px-4 py-2 border border-gray-200 rounded-lg text-base focus:outline-none focus:ring-2 focus:ring-blue-500 focus:border-transparent"
+	/>
+</div>