Polish: npm test runs every test file, two silent failures now log, Loading placeholders shimmer

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

package.json

@@ -5,7 +5,7 @@
   "main": "server.js",
   "scripts": {
     "start": "node server.js",
-    "test": "for t in smoke frontend tasks push users cal plex player lyrics signal mail mail-imap files podcast abapi abdirect books store librivox radio vbv savefiles bible lrclib visualizer body settingskeys transcript recipes contacts mystore caldav musicdata screentime chat notes chores kidlimits search inbox family board chores-view kidcontrols kidsearch; do node tools/$t-test.js || exit 1; done",
+    "test": "node tools/run-tests.js",
     "audit": "npm audit --omit=dev --audit-level=high"
   },
   "keywords": [],