Fix type changes, tag navigation, and routing cleanup

- set_entry removes entry from old bucket when type changes (fixes duplicates)
- PUT /api/entries/:id now accepts type field
- Tag clicks navigate via URL (#type/x/tag/y or #tag/y) instead of mutating state
- Replace magic 'all' hash with empty hash as the all-entries route
- Clickable tags in entry detail view
- Tag filter dropdown updates URL

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

lib/storage.mjs

@@ -127,6 +127,15 @@ export function get_entry(id) {
 }
 
 export function set_entry(entry) {
+	// Remove from any other bucket in case type changed
+	for (const t of Object.keys(store.get('entry_types') ?? {})) {
+		if (t === entry.type) { continue; }
+		const bucket = store.get(t);
+		if (bucket?.[entry.id]) {
+			delete bucket[entry.id];
+			store.set(t, bucket);
+		}
+	}
 	const bucket = store.get(entry.type) ?? {};
 	bucket[entry.id] = entry;
 	store.set(entry.type, bucket);