chore: Enforce a few house rules via eslint (#2539)

src/card-controller/fullscreen/screenfull/index.ts

@@ -32,9 +32,12 @@ export class ScreenfullFullScreenProvider
     }
 
     if (fullscreen) {
-      screenfull.request(this._api.getCardElementManager().getElement());
+      // A denied request (or an exit when not in fullscreen) leaves the UI
+      // consistent: the 'change' handler only fires on a real transition.
+      // Nothing to act on.
+      screenfull.request(this._api.getCardElementManager().getElement()).catch(() => {});
     } else {
-      screenfull.exit();
+      screenfull.exit().catch(() => {});
     }
   }
 }

src/card-controller/fullscreen/webkit/index.ts

@@ -85,7 +85,10 @@ export class WebkitFullScreenProvider
     // clicking the 'X' which then fires this event). That's probably the rare
     // case though.
     this._playTimer.start(WEBKIT_PLAY_SECONDS, () => {
-      this._getVideoElement()?.play();
+      // Best-effort resume after a fullscreen exit.
+      this._getVideoElement()
+        ?.play()
+        .catch(() => {});
     });
   };
 }