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/PlayerModal.dom.test.tsx

@@ -424,8 +424,6 @@ describe("PlayerModal — the description", () => {
   });
 });
 
-// C3: the queue's side arrows sit in a gutter of the card's row, not outside it, so no window cuts
-// them off (outside the card, a 1024 window cut them and a portrait tablet lost them).
 // The full-height strips beside the card were a second Previous / Next that cost the video 7rem of
 // width (owner): the panel's transport row and Shift+← / → step on their own.
 describe("PlayerModal — no side strips", () => {

frontend/src/components/PlayerModal.tsx

@@ -671,8 +671,8 @@ export default function PlayerModal({
   // The card's width budget (its maxWidth, below): the video's, and the side panel's when wide.
   const fitWidth = `(100dvh - 3rem - ${below}px) * 16 / 9`;
   const panelWidth = panelShut ? PANEL_STRIP : SIDE_PANEL;
-  // One Close, icon only, in the card's top-right corner: the wide panel's head (or its strip), the
-  // stacked card's title row.
+  // One Close, icon only: at the top right of the wide panel's head (or its strip), at the end of the
+  // stacked card's title row under the video.
   const closeButton = (
     <IconButton
       variant="ghost"

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