fix(design): the saved-view chip on one line, one Escape per layer, the /watch action row (E28 S3d)

- SelectTrigger lays its toolbar value out as a row; the saved-view chip passes its glyph and
  modified dot through the icon/trailing slots (an <svg> is display:block and broke the chip in two).
- One Escape in a dialog's open list closed the list AND the dialog: the list's close flushes
  synchronously and pops its layer before the dialog's window listener runs. takeEscape() is the one
  close-on-Escape test (topmost AND not yet taken); Modal, the Welcome lightbox and useLayer use it,
  and keymap.dispatch ignores a taken Escape.
- /watch: the Download sits on the toolbar rung, level with the Repeat chip.

frontend/src/components/Welcome.tsx

@@ -30,7 +30,7 @@ import { setLanguage, type LangCode } from "../i18n";
 import LanguageSwitcher from "./LanguageSwitcher";
 import { Button } from "./ui/Button";
 import { trapTab, useDialogChrome } from "./ui/dialogFocus";
-import { anyBlockingLayerAbove, isTopmost, pushLayer, removeLayer } from "../lib/layerStack";
+import { anyBlockingLayerAbove, pushLayer, removeLayer, takeEscape } from "../lib/layerStack";
 import { entryHash, entrySearch } from "../lib/entryUrl";
 import type { VerifyEntry } from "../lib/useVerifyEntry";
 import { MODE_URL, type Mode } from "./welcomeMode";
@@ -283,7 +283,7 @@ function Lightbox({ src, label, onClose }: { src: string; label: string; onClose
     // landing page grows (deep-review round 7).
     const id = pushLayer();
     const onKey = (e: KeyboardEvent) => {
-      if (e.key === "Escape" && isTopmost(id)) {
+      if (takeEscape(e, id)) {
         e.stopPropagation();
         onCloseRef.current();
         return;