Radio starts empty and fills from the Store (Add to Radio, including The Journey FM); iCloud connect falls back to the calendar home beside the principal

- Store > Radio is the station finder with Add to Radio / Added; Radio under Listen lists only what was added
- Fix the Radio tab going blank (the router passed its arguments as the Store host)
- iCloud: when the account reports no calendar home, try /<id>/calendars/, and say what iCloud answered if that fails

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 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 transcript recipes contacts mystore; do node tools/$t-test.js || exit 1; done",
+    "test": "for t in smoke tasks push users cal plex player lyrics signal mail mail-imap files podcast abapi abdirect books store librivox radio vbv savefiles bible lrclib visualizer body transcript recipes contacts mystore caldav; do node tools/$t-test.js || exit 1; done",
     "audit": "npm audit --omit=dev --audit-level=high"
   },
   "keywords": [],