web/src/lib/player/store.svelte.ts

@@ -462,7 +462,18 @@ $effect.root(() => {
 
     _radioRefreshInFlight = true;
     const seed = _radioSeedId;
-    const exclude = _queue.map((t) => t.id).join(',');
+    // Drift #554: cap the exclude list so a multi-hour radio session
+    // doesn't grow the query string past common 8KB limits and start
+    // 414-ing /api/radio. The .catch() below would silently swallow
+    // that failure and the player would stop topping up — a dead
+    // radio. The server's RecentlyPlayedHours filter already handles
+    // broader history dedup, so the request-side exclude only needs
+    // to cover the visible queue's recent tail.
+    const RADIO_EXCLUDE_CAP = 100;
+    const exclude = _queue
+      .slice(-RADIO_EXCLUDE_CAP)
+      .map((t) => t.id)
+      .join(',');
     api
       .get<RadioResponse>(
         `/api/radio?seed_track=${encodeURIComponent(seed)}&exclude=${exclude}`

web/src/routes/library/+page.ts

@@ -4,6 +4,11 @@ import { redirect } from '@sveltejs/kit';
 // always renders the active sub-page. Bare hits go to the default tab
 // (Artists, matching Android's LibraryScreen default). 308 = permanent
 // + preserve method, so SPA navigations and direct loads behave the same.
+//
+// Drift #559: this was a +page.server.ts which DOES NOT run in
+// production — the app is configured as adapter-static + ssr=false
+// (see +layout.ts). +page.ts (universal load) runs client-side, which
+// is what the SPA actually executes when a route is hit.
 export const load = () => {
   throw redirect(308, '/library/artists');
 };

web/src/routes/playlists/+page.ts

@@ -5,6 +5,10 @@ import { redirect } from '@sveltejs/kit';
 // still lives here at /routes/playlists/[id]/+page.svelte — that URL
 // matches the server API shape and is unchanged.
 // 308 = permanent + preserve method; old bookmarks land on the new URL.
+//
+// Drift #559: this was a +page.server.ts which DOES NOT run in
+// production (adapter-static + ssr=false, see +layout.ts). +page.ts
+// universal load runs client-side and IS what the SPA executes.
 export const load = () => {
   throw redirect(308, '/library/playlists');
 };