build(frontend): close the lint gaps the E32 audit measured

eslint now also enforces:
- the React Compiler diagnostics that `recommended` leaves out (todo,
  memo-dependencies and ten zero-hit tripwires);
- a description on every suppression, and no blanket disables;
- no focused or skipped tests (vitest and playwright);
- the typed pair no-floating-promises and no-deprecated.

Lint also covers e2e/ and the TypeScript build configs, which `eslint .`
had been skipping in silence.

Every hit is fixed or suppressed inline with a named reason:
- The 31 try statements the compiler cannot lower yet carry a suppression
  until S3 rewrites them. Five other compiler skips were plain fixes:
  a module counter bumped inside a hook, a ref read in a default
  parameter, and a local named like the <section> it renders.
- The real defects behind floating promises are fixed. ChatDock threw at
  nobody when the device key store could not be opened. VideoEditor's
  play() rejection went unhandled. loadYouTubeApi never rejected, so a
  blocked IFrame API left the player on an empty stage forever; it now
  fails on a script error or after 15 s, shows its own error with the
  way out, and lets the next open try again.
- MutableRefObject, FormEvent and lucide's deprecated brand icon are
  replaced. The YouTube glyph now lives in lib/brandIcons.
- The lint-probe harness lets its virtual file names into TypeScript's
  default project, so the contract tests still run the real config.

frontend/src/components/PlexPlayer.controls.dom.test.tsx

@@ -219,7 +219,9 @@ describe("a tap on the picture (C3)", () => {
     video()._paused = true;
     act(() => void video().play());
     expect(bandHidden()).toBe(false);
-    act(() => vi.advanceTimersByTime(3000));
+    act(() => {
+      vi.advanceTimersByTime(3000);
+    });
     expect(bandHidden()).toBe(true);
   });
 });
@@ -247,10 +249,14 @@ describe("keyboard focus in the bands", () => {
     fireEvent.keyDown(document.body, { key: "Tab" }); // the keyboard is in use: focus shows
     act(() => vol.focus());
     fireEvent.keyDown(vol, { key: "ArrowUp" });
-    act(() => vi.advanceTimersByTime(5000));
+    act(() => {
+      vi.advanceTimersByTime(5000);
+    });
     expect(bandHidden()).toBe(false);
     act(() => vol.blur());
-    act(() => vi.advanceTimersByTime(3000));
+    act(() => {
+      vi.advanceTimersByTime(3000);
+    });
     expect(bandHidden()).toBe(true);
   });
 
@@ -264,9 +270,13 @@ describe("keyboard focus in the bands", () => {
     fireEvent.keyDown(document.body, { key: "Tab" });
     act(() => vol.focus());
     fireEvent.keyDown(vol, { key: "ArrowUp" });
-    act(() => vi.advanceTimersByTime(9000));
+    act(() => {
+      vi.advanceTimersByTime(9000);
+    });
     expect(bandHidden()).toBe(false);
-    act(() => vi.advanceTimersByTime(1500));
+    act(() => {
+      vi.advanceTimersByTime(1500);
+    });
     expect(bandHidden()).toBe(true);
     expect(document.activeElement).toBe(vol);
     fireEvent.keyDown(vol, { key: "ArrowUp" });
@@ -283,7 +293,9 @@ describe("keyboard focus in the bands", () => {
     fireEvent.keyDown(document.body, { key: "Tab" });
     act(() => mute.focus());
     fireEvent.keyDown(mute, { key: "ArrowUp" });
-    act(() => vi.advanceTimersByTime(10_500));
+    act(() => {
+      vi.advanceTimersByTime(10_500);
+    });
     expect(bandHidden()).toBe(true);
     const pauses = pause.mock.calls.length;
     // prevented: the unseen Mute is not pressed on keyup
@@ -304,7 +316,9 @@ describe("keyboard focus in the bands", () => {
     fireEvent.keyDown(document.body, { key: "Tab" });
     act(() => mute.focus());
     fireEvent.keyDown(mute, { key: "ArrowUp" });
-    act(() => vi.advanceTimersByTime(10_500));
+    act(() => {
+      vi.advanceTimersByTime(10_500);
+    });
     expect(bandHidden()).toBe(true);
     const pauses = pause.mock.calls.length;
     expect(fireEvent.keyDown(mute, { key: "Enter" })).toBe(false);
@@ -325,7 +339,9 @@ describe("keyboard focus in the bands", () => {
       fireEvent.keyDown(document.body, { key: "Tab" });
       act(() => mute.focus());
       fireEvent.keyDown(mute, { key: "ArrowUp" });
-      act(() => vi.advanceTimersByTime(10_500));
+      act(() => {
+        vi.advanceTimersByTime(10_500);
+      });
       expect(bandHidden()).toBe(true);
       expect(fireEvent.keyDown(mute, { key })).toBe(false);
       const toggles = pause.mock.calls.length + play.mock.calls.length;
@@ -352,7 +368,9 @@ describe("keyboard focus in the bands", () => {
     const skip = screen.getByRole("button", { name: /plex\.player\.skipIntro/ });
     fireEvent.keyDown(document.body, { key: "Tab" });
     act(() => skip.focus());
-    act(() => vi.advanceTimersByTime(10_500));
+    act(() => {
+      vi.advanceTimersByTime(10_500);
+    });
     expect(bandHidden()).toBe(true);
     const pauses = pause.mock.calls.length;
     // not prevented: the button's own activation runs, and Space does not pause the film instead
@@ -377,7 +395,9 @@ describe("keyboard focus in the bands", () => {
       return sel === ":focus-visible" ? false : matches.call(this, sel);
     });
     act(() => btn.focus());
-    act(() => vi.advanceTimersByTime(3000));
+    act(() => {
+      vi.advanceTimersByTime(3000);
+    });
     expect(bandHidden()).toBe(true);
     act(() => btn.blur()); // the tap on the picture takes the focus first…
     pressPicture("touch"); // …then toggles
@@ -428,7 +448,9 @@ describe("a double-tap on a side third skips 10 s (C5)", () => {
     pressPicture("touch", 450); // reveal
     expect(bandHidden()).toBe(false);
     expect(band()).toContain("pointer-events-none");
-    act(() => vi.advanceTimersByTime(300));
+    act(() => {
+      vi.advanceTimersByTime(300);
+    });
     expect(band()).not.toContain("pointer-events-none");
   });