fix(player): a link that opens the cut text is scrolled back into view

Focus had scrolled the clamped box itself; opened, the link dropped by that much, out of a scrolling panel's sight. DESIGN states where Close sits in the stacked layout; a stale test comment goes.

frontend/src/components/ui/ClampedText.dom.test.tsx

@@ -65,8 +65,13 @@ describe("ClampedText", () => {
       // Chrome: 45 px), so on screen the link sits inside the box: only the text's own top tells.
       clamp.scrollTop = 240;
       vi.spyOn(screen.getByText("cut"), "getBoundingClientRect").mockReturnValue(rect(130, 150));
+      // Opened, the link drops back to its place in the text, as far as the box had scrolled: in a
+      // scrolling panel that is out of sight, so it is brought back into view.
+      const reveal = vi.fn();
+      screen.getByText("cut").scrollIntoView = reveal;
       act(() => screen.getByText("cut").focus());
       expect(screen.getByText("Less").getAttribute("aria-expanded")).toBe("true");
+      expect(reveal).toHaveBeenCalledWith({ block: "nearest" });
     } finally {
       tall.mockRestore();
       box.mockRestore();

frontend/src/components/ui/ClampedText.tsx

@@ -49,12 +49,22 @@ export function ClampedText({
   }, [text, expanded]);
   // Measured from the text's top, not against the box on screen: focus scrolls the clamped box itself
   // to bring the link into view (overflow:hidden still scrolls), so on screen it looked "in sight".
+  const revealing = useRef<Element | null>(null);
   const revealFocused = (e: FocusEvent<HTMLDivElement>) => {
     const box = e.currentTarget;
     if (expanded || e.target === box) return;
     const top = box.getBoundingClientRect().top - box.scrollTop;
-    if (e.target.getBoundingClientRect().bottom - top > box.clientHeight + 1) setExpanded(true);
+    if (e.target.getBoundingClientRect().bottom - top <= box.clientHeight + 1) return;
+    revealing.current = e.target;
+    setExpanded(true);
   };
+  // That scroll was the box's own: opened, the link drops back to its place in the text, as far below
+  // as the box had scrolled, and out of a scrolling panel's sight. Brought back into view.
+  useLayoutEffect(() => {
+    const el = revealing.current;
+    revealing.current = null;
+    if (expanded && el?.isConnected) el.scrollIntoView({ block: "nearest" });
+  }, [expanded]);
   return (
     <div className={className}>
       <div