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>

tools/radio-test.js

@@ -27,7 +27,7 @@ const fake = http.createServer((req, res) => {
   const hub = http.createServer((req, res) => users.runAs(req.headers['x-user'] === 'b' ? people.b : people.a, () => radio.handle(req, res))).listen(0, async () => {
     const base = 'http://127.0.0.1:' + hub.address().port + '/api/radio', call = (p, o = {}) => fetch(base + p, o), j = r => r.json();
     try {
-      let r = await j(await call('/stations')); assert.equal(r.featured[0].name, 'The Journey FM'); assert.equal(r.featured[0].id, 'journeyfm'); assert.deepEqual(r.mine, []);
+      let r = await j(await call('/stations')); assert.equal(r.featured[0].name, 'The Journey FM'); assert.equal(r.featured[0].id, 'journeyfm'); assert.deepEqual(r.mine, []); assert.deepEqual(r.added, [], 'nothing is on Radio until it is added from the Store');
       r = await j(await call('/search?q=good')); assert.deepEqual(r.items.map(s => s.name), ['Good FM'], 'streams a browser cannot play (HLS, odd codecs) and nameless ones are left out'); assert.equal(r.items[0].tags, 'christian,worship,pop,extra'); assert.equal(r.items[0].id, 'aaaaaaaa-1111');
       assert.equal((await call('/search')).status, 200, 'no words: Christian stations');
       // the stream
@@ -48,6 +48,8 @@ const fake = http.createServer((req, res) => {
       assert.equal((await call('/stations', { method: 'POST', body: JSON.stringify({ id: 'aaaaaaaa-1111' }) })).status, 200); r = await j(await call('/stations')); assert.deepEqual(r.mine.map(s => s.name), ['Good FM']);
       await call('/stations', { method: 'POST', body: JSON.stringify({ id: 'aaaaaaaa-1111' }) }); assert.equal((await j(await call('/stations'))).mine.length, 1, 'saving twice keeps one');
       assert.deepEqual((await j(await call('/stations', { headers: { 'x-user': 'b' } }))).mine, [], "each person's list is their own");
+      await call('/stations', { method: 'POST', body: JSON.stringify({ id: 'journeyfm' }) }); assert.deepEqual((await j(await call('/stations'))).added, ['journeyfm'], 'the Journey is added like any other'); assert.deepEqual((await j(await call('/stations'))).mine.map(s => s.name), ['Good FM'], 'and is not mixed into the saved list'); assert.deepEqual((await j(await call('/stations', { headers: { 'x-user': 'b' } }))).added, []);
+      await call('/stations/journeyfm', { method: 'DELETE' }); assert.deepEqual((await j(await call('/stations'))).added, []);
       await call('/stations/aaaaaaaa-1111', { method: 'DELETE' }); assert.deepEqual((await j(await call('/stations'))).mine, []);
       r = await call('/icon?u=' + encodeURIComponent(`http://127.0.0.1:${port}/logo.png`)); assert.equal(r.headers.get('content-type'), 'image/png'); assert.equal((await call('/icon?u=' + encodeURIComponent(`http://127.0.0.1:${port}/stream`))).status, 404, 'only pictures come through as icons');
       // private addresses