Channel grid: always query bundled default relays (fix videos on nos.lol never showing)

Root cause of "a known video never shows on the channel": the video was a
whitelisted creator's NIP-71 note that lives ONLY on nos.lol, but the channel
fetch queried nostrClient.relays — the user's CAPPED NIP-65 read set — which
dropped nos.lol, so we never queried the one relay that had it. Confirmed by
per-relay probe: snort/damus/primal returned 0, nos.lol returned the 2 videos.

loadUserVideos now unions the user's relays with DEFAULT_RELAY_URLS (nos.lol,
damus, primal, snort) for the scoped channel fetch, so a creator's videos on
any bundled default relay are found regardless of the read cap. Channel pages
are a deliberate request for one creator, so the slightly wider fan-out is fine.

Co-Authored-By: Claude Opus 4.8 <[email protected]>

js/channelProfile.js

@@ -5611,7 +5611,14 @@ async function loadUserVideos(pubkey) {
     const knownRelays = Array.isArray(nostrClient.relays)
       ? nostrClient.relays
       : Array.from(nostrClient.relays || []);
-    const relayList = knownRelays.filter((url) => isValidRelayUrl(url));
+    // ALWAYS include the bundled defaults. A creator's videos can live only on
+    // a default relay (e.g. a NIP-71 video that's only on nos.lol) that the
+    // user's capped NIP-65 read set excludes — otherwise a known, whitelisted
+    // video never shows on the channel because we never query the one relay
+    // that has it.
+    const relayList = [
+      ...new Set([...knownRelays, ...DEFAULT_RELAY_URLS]),
+    ].filter((url) => isValidRelayUrl(url));
 
     // Route one fetch through the app's PROVEN path (the same one "My Videos"
     // uses on refresh). It streams into the shared cache, so this grid, its