fix(player): re-entering a video no longer opens the audio player (DR-100)

Leaving a video and returning to it rendered the movie/episode in
AudioPlayer. Closing a webview-rendered video deliberately emits no
"stopped" state (that would break the autoplay handoff), and the
direct-play path does not stop the backend on unmount, so the Rust
controller still reported that item as its loaded media. Re-entering the
route therefore took the "already playing, just show the UI" shortcut,
which returns before a stream URL is fetched, and the render fell
through to the audio surface. Mostly visible on Android, where video
direct-plays; Linux transcodes and stops the backend on unmount.

Both decisions move into playerSurface.ts as pure functions:
shouldReuseActivePlayback excludes video, so video always takes the full
load path and gets its stream URL and resume position;
resolvePlayerSurface maps video-without-a-stream-URL to "pending"
(spinner) rather than falling through to audio.

scripts/extract-traces.test.ts

@@ -175,8 +175,8 @@ describe("live requirements.md", () => {
 
     expect(defined.UR).toBe(61);
     expect(defined.IR).toBe(29);
-    expect(defined.DR).toBe(96);
+    expect(defined.DR).toBe(97);
     expect(defined.JA).toBe(32);
-    expect(defined.total).toBe(218);
+    expect(defined.total).toBe(219);
   });
 });