fix: exclude archived/trashed notes from tag list

The allTags derived store now filters out archived and trashed notes
before collecting tags, so the sidebar tag filter only shows tags that
yield visible results.

Closes #9

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

src/lib/stores/notes.ts

@@ -37,7 +37,9 @@ export const unpinnedNotes = derived(filteredNotes, ($notes) =>
 
 export const allTags = derived(notes, ($notes) => {
 	const tagSet = new Set<string>();
-	$notes.forEach((n) => n.tags?.forEach((t) => tagSet.add(t)));
+	$notes
+		.filter((n) => !n.archived && !n.trashed)
+		.forEach((n) => n.tags?.forEach((t) => tagSet.add(t)));
 	return [...tagSet].sort();
 });