library: rename Scan nav/page to Library, show audio codecs per row

Per-row audio codec summary (distinct lowercased codecs across an
item's audio streams) via scalar subquery on media_streams, rendered
as "ac3 · aac" in a new monospace Audio column.

v2026.04.15.9

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/api/scan.ts

@@ -163,7 +163,11 @@ app.get("/items", (c) => {
 			`
 			SELECT id, jellyfin_id, name, type, series_name, season_number, episode_number,
 			       scan_status, original_language, orig_lang_source, container, file_size, file_path,
-			       last_scanned_at, ingest_source
+			       last_scanned_at, ingest_source,
+			       (SELECT GROUP_CONCAT(DISTINCT LOWER(codec))
+			        FROM media_streams
+			        WHERE item_id = media_items.id AND type = 'Audio' AND codec IS NOT NULL
+			       ) AS audio_codecs
 			FROM media_items
 			${where.sql}
 			ORDER BY COALESCE(last_scanned_at, created_at) DESC, id DESC
@@ -186,6 +190,7 @@ app.get("/items", (c) => {
 		file_path: string;
 		last_scanned_at: string | null;
 		ingest_source: string | null;
+		audio_codecs: string | null;
 	}>;
 	const total = (db.prepare(`SELECT COUNT(*) as n FROM media_items ${where.sql}`).get(...where.args) as { n: number }).n;
 	return c.json({ rows, total, hasMore: query.offset + rows.length < total, query });