feat: parse hashtags from content instead of dedicated tag input

Tags are now automatically extracted from #hashtags in content text.
Removed TagInput from entry editing, keeping it only in FilterBar.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/lib/components/EntryCard.svelte

@@ -5,8 +5,8 @@
 	import { slide } from 'svelte/transition';
 	import ImageGallery from './ImageGallery.svelte';
 	import ImageUpload from './ImageUpload.svelte';
-	import TagInput from './TagInput.svelte';
 	import { highlightText } from '$lib/utils/highlightText';
+	import { highlightHashtags } from '$lib/utils/parseHashtags';
 
 	interface EntryWithData extends Entry {
 		images: Image[];
@@ -15,11 +15,10 @@
 
 	interface Props {
 		entry: EntryWithData;
-		availableTags: Tag[];
 		searchQuery?: string;
 	}
 
-	let { entry, availableTags, searchQuery = '' }: Props = $props();
+	let { entry, searchQuery = '' }: Props = $props();
 
 	// Expand/collapse state
 	let expanded = $state(false);
@@ -33,7 +32,6 @@
 	let editContent = $state(entry.content);
 	let editType = $state(entry.type);
 	let editDueDate = $state(entry.dueDate || '');
-	let editTags = $state<Tag[]>(entry.tags || []);
 
 	// Sync edit state when entry changes (after invalidateAll)
 	$effect(() => {
@@ -42,7 +40,6 @@
 			editContent = entry.content;
 			editType = entry.type;
 			editDueDate = entry.dueDate || '';
-			editTags = entry.tags || [];
 		}
 	});
 
@@ -192,22 +189,6 @@
 		await invalidateAll();
 	}
 
-	async function handleTagsChange(newTags: Tag[]) {
-		editTags = newTags;
-
-		// Save immediately (no debounce for tags)
-		const formData = new FormData();
-		formData.append('id', entry.id);
-		formData.append('tags', JSON.stringify(newTags.map((t) => t.name)));
-
-		await fetch('?/updateTags', {
-			method: 'POST',
-			body: formData
-		});
-
-		await invalidateAll();
-	}
-
 	async function handleCameraInput(e: Event) {
 		const input = e.target as HTMLInputElement;
 		const file = input.files?.[0];
@@ -317,7 +298,7 @@
 						{#if searchQuery}
 							{@html highlightText(entry.content, searchQuery)}
 						{:else}
-							{entry.content}
+							{@html highlightHashtags(entry.content)}
 						{/if}
 					</p>
 					{#if entry.tags?.length > 0}
@@ -510,12 +491,6 @@
 					</div>
 				</div>
 
-				<!-- Tags section -->
-				<div>
-					<label class="block text-sm font-medium text-gray-700 mb-1">Tags</label>
-					<TagInput {availableTags} selectedTags={editTags} onchange={handleTagsChange} />
-				</div>
-
 				<div class="flex items-center justify-between">
 					<div>
 						<label for="edit-type-{entry.id}" class="block text-sm font-medium text-gray-700 mb-1"

src/lib/components/EntryList.svelte

@@ -12,12 +12,11 @@
 
 	interface Props {
 		entries: EntryWithData[];
-		availableTags: Tag[];
 		filters: SearchFilters;
 		searchQuery: string;
 	}
 
-	let { entries, availableTags, filters, searchQuery }: Props = $props();
+	let { entries, filters, searchQuery }: Props = $props();
 
 	// Apply filtering
 	let filteredEntries = $derived(filterEntries(entries, filters));
@@ -44,7 +43,7 @@
 	<!-- Flat list when filtering (no pinned/unpinned separation) -->
 	<div class="divide-y divide-gray-100 md:divide-y-0 md:space-y-3">
 		{#each filteredEntries as entry (entry.id)}
-			<EntryCard {entry} {availableTags} {searchQuery} />
+			<EntryCard {entry} {searchQuery} />
 		{/each}
 	</div>
 {:else}
@@ -56,7 +55,7 @@
 			</h2>
 			<div class="divide-y divide-gray-100 md:divide-y-0 md:space-y-3">
 				{#each pinnedEntries as entry (entry.id)}
-					<EntryCard {entry} {availableTags} {searchQuery} />
+					<EntryCard {entry} {searchQuery} />
 				{/each}
 			</div>
 		</div>
@@ -65,7 +64,7 @@
 	{#if unpinnedEntries.length > 0}
 		<div class="divide-y divide-gray-100 md:divide-y-0 md:space-y-3">
 			{#each unpinnedEntries as entry (entry.id)}
-				<EntryCard {entry} {availableTags} {searchQuery} />
+				<EntryCard {entry} {searchQuery} />
 			{/each}
 		</div>
 	{/if}

src/lib/utils/parseHashtags.ts

@@ -0,0 +1,31 @@
+/**
+ * Extract hashtags from text content
+ * Matches #word patterns, supporting alphanumeric and underscores
+ */
+export function parseHashtags(text: string): string[] {
+	const hashtagRegex = /#([a-zA-Z][a-zA-Z0-9_]*)/g;
+	const matches = text.matchAll(hashtagRegex);
+	const tags = new Set<string>();
+
+	for (const match of matches) {
+		tags.add(match[1].toLowerCase());
+	}
+
+	return Array.from(tags);
+}
+
+/**
+ * Highlight hashtags in text for display
+ * Returns HTML with hashtags wrapped in styled spans
+ */
+export function highlightHashtags(text: string): string {
+	const escaped = text
+		.replace(/&/g, '&amp;')
+		.replace(/</g, '&lt;')
+		.replace(/>/g, '&gt;');
+
+	return escaped.replace(
+		/#([a-zA-Z][a-zA-Z0-9_]*)/g,
+		'<span class="text-blue-600 font-medium">#$1</span>'
+	);
+}