fix: review round 1 — row press after a rename, related reset, dead items on removal, honest Prev/Next

- A press that begins while a field in the row is edited only ends the editing (rowOpen latches it
  at pointerdown); the card layout's row press is now tested.
- A related video reset in the player forgets the session's stored position.
- Removing the playing video passes over known-dead items and steps the way it went.
- Prev/Next off only because of dead items stay focusable and say why (HU/EN).
- The docked bar's scroller leaves room for focus rings.
- A focus-opened About card is not closed by its own scroll into view.
- EN "Clear watch progress" for the video reset, distinct from a page's "Reset view".
- The signed-out title read goes to the page yt-dlp read; the retitle writes are conditional.
- Tests: the cap of three errors, the bar's own Fullscreen, the group glyph, the backfill's reads.

frontend/src/modules/feed/Feed.toolbar.dom.test.tsx

@@ -85,6 +85,8 @@ async function renderFeed(channelScoped = false) {
 const trigger = (name: string) =>
   screen.getAllByRole("button").find((b) => b.getAttribute("aria-label")?.startsWith(`${name}:`))!;
 const sortTrigger = () => trigger("feed.sortLabel");
+// The group's glyph, not the trigger's own chevron: the glyph sits in its aria-hidden wrapper.
+const glyph = (el: HTMLElement) => el.querySelector('[aria-hidden="true"] > svg');
 
 describe("Feed toolbar", () => {
   it.each([
@@ -94,7 +96,7 @@ describe("Feed toolbar", () => {
     await renderFeed();
     const pill = screen.getByTestId(id);
     expect(pill.textContent).not.toContain(word);
-    expect(pill.querySelector("svg")).not.toBeNull();
+    expect(glyph(pill)).not.toBeNull();
     expect(pill.getAttribute("title")).toBe(word);
     expect(pill.getAttribute("aria-label")).toMatch(new RegExp(`^${word}: `));
   });
@@ -103,6 +105,7 @@ describe("Feed toolbar", () => {
     await renderFeed();
     const sort = sortTrigger();
     expect(sort.textContent).not.toContain("feed.sortLabel");
+    expect(glyph(sort)).not.toBeNull();
     expect(sort.getAttribute("title")).toBe("feed.sortLabel");
   });