Play albums by their Music Assistant URI

Names can match near-duplicate library albums that differ only in capitals (Let the/The Tribe Increase), and Music Assistant picked the unplayable one. Assignments now store the album's library URI, scans return it after checking it's still in the library (re-finding it by name, exact spelling first, if not), and HA plays by it. sync-library (formerly fetch-covers) links existing assignments.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/conftest.py

@@ -1,9 +1,10 @@
+import httpx
 import pytest
 from fastapi.testclient import TestClient
 
 from tag_albums.app import create_app
 from tag_albums.config import Settings
-from tag_albums.library import Album
+from tag_albums.library import Album, MusicLibrary, _best_match
 from tag_albums.store import Store
 
 TOKEN = "test-token"
@@ -14,15 +15,24 @@ class FakeLibrary:
     def __init__(self):
         self.queries = []
         self.fetched = []
+        self.fail_search = False
+        self.library = [Album(artist="Tool", album="Lateralus", image="http://img/1", uri="library://album/1868")]
         self.images = {"http://img/1": (b"\x89PNG-lateralus", "image/png")}
 
     def search_albums(self, query, limit=12):
         self.queries.append(query)
-        return [Album(artist="Tool", album="Lateralus", image="http://img/1")]
+        return list(self.library)
 
     def find_album(self, artist, album):
-        found = self.search_albums(album)[0]
-        return found if (found.artist, found.album) == (artist, album) else None
+        return _best_match(self.search_albums(album), artist, album)
+
+    def current_uri(self, uri, artist, album):
+        if self.fail_search:
+            raise httpx.ConnectError("HA down")
+        return MusicLibrary.current_uri(self, uri, artist, album)
+
+    def image_download_url(self, url):
+        return url
 
     def fetch_image(self, url):
         self.fetched.append(url)