fix(keys): epic-end review round 1 — Back, menus and dialogs keep the focus where it belongs

Deep-review of E11 (19 raised, 14 confirmed; 2 refuted, 3 latent test-hardening notes dropped).

- Back from a sub-view (a Plex show page, a Messages thread) restores the item it was opened from
  even when focus was still inside the view: the first attempt now waits one task, past the
  sub-view's own popstate listener (measured in Chrome: it left focus on <body>).
- The restore listener is installed at load, so the first Back after a reload finds it; a push
  cancels a restore still waiting for the last landing's lists.
- Navigating over an overlay asks it again, a render apart, while its entry stays: the Plex
  player peels one panel per Back step, so Shift+W over info + stats closed one panel and dropped
  the navigation.
- j/k: a native <button> item keeps its own Tab stop; landing twice on the same item no longer
  leaks its tabindex; after the focused item is removed (a hidden card) the next j goes on from
  its slot when that slot is on screen.
- An abandoned `g` no longer swallows a modifier chord (g, then Mod+K opened the browser search).
- A hover card above a dialog no longer switches its Tab trap off (player, Modal, wizard,
  Lightbox): new layerStack `anyBlockingLayerAbove`.
- "Manage views…" closes its menu before opening the dialog, through a shared `closeThenAct`
  that ActionMenu now uses too.
- Copy: the EN welcome says "Feed"; the EN unreachable reason no longer claims a change;
  stale comments about PlayerModal's scroll lock and dialog contract.

frontend/src/components/SavedViewsPopover.tsx

@@ -1,7 +1,12 @@
 import { useState, type ReactNode } from "react";
 import { useTranslation } from "react-i18next";
 import { Bookmark, Check, Settings2 } from "lucide-react";
-import { PopoverItem, PopoverSurface, useAnchoredPopover } from "./ui/AnchoredPopover";
+import {
+  PopoverItem,
+  PopoverSurface,
+  closeThenAct,
+  useAnchoredPopover,
+} from "./ui/AnchoredPopover";
 import { useSavedViews } from "./SavedViewsProvider";
 
 // The saved-views quick-picker. The filter-panel header's icon (and the toolbar's view chip) use it as
@@ -67,10 +72,8 @@ export default function SavedViewsPopover({
         <div className="mt-1 border-t border-border pt-1">
           <PopoverItem
             role="menuitem"
-            onSelect={() => {
-              openModal();
-              setOpen(false);
-            }}
+            // Opens a dialog: close first, or the menu's focus return steals its focus (closeThenAct).
+            onSelect={() => closeThenAct(() => setOpen(false), openModal)}
             label={t("views.manage")}
             className="flex w-full items-center gap-2 rounded-md px-2 py-1.5 text-left text-sm text-muted transition hover:text-fg"
           >