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"