feat(plex): port the filter bar to the YT-feed pattern

Bring the Plex module's filter surface in line with the feed's final shape:

- Flatten the rail: PlexSidebar passes `collapsible={false}` to FilterRail so
  the widgets become plain always-open label + control rows (no collapse
  chevrons; reorder/hide in edit mode stay). Drop the rail's own "Clear all" —
  the chip row above the grid already owns it.
- Move Sort + the Discover/Browse toggle into the applied-filter chip row,
  pinned right directly above the grid (a `sortView` fragment, like the feed's),
  and give ActiveFilterChips `flex-1` so it gets the shared responsive overflow
  (wide: fit + "+N" pill; narrow: single "N filters" count pill) — the chips can
  no longer crowd the controls off-screen.

ItemCount leads its own toolbar row, matching the feed. No behaviour change to
Discover, which keeps its standalone view toggle.

frontend/src/components/PlexBrowse.tsx

@@ -369,6 +369,24 @@ export default function PlexBrowse() {
     />
   );
 
+  // Sort + the Discover/Browse toggle are tightly bound to the grid below, so on the grid view they
+  // live pinned to the right of the applied-filter chip row (directly above the cards), not on their
+  // own toolbar line — the same idiom as the Feed's `sortView`.
+  const sortView = (
+    <>
+      <SortControl
+        options={sortOptions}
+        sort={sortState}
+        onChange={(next) => setSort(next ?? PLEX_SORT_FALLBACK)}
+        label={t("plex.filter.sort")}
+        ascLabel={t("plex.filter.dir.asc")}
+        descLabel={t("plex.filter.dir.desc")}
+      />
+      <span className="mx-0.5 h-5 w-px bg-border" aria-hidden="true" />
+      {viewToggle}
+    </>
+  );
+
   if (sub.view.kind === "discover") {
     return (
       <div className="p-4 max-w-[1600px] mx-auto">
@@ -389,25 +407,22 @@ export default function PlexBrowse() {
       {/* The title count is fixed chrome — it portals into the shell's fixed band so it stays put
           while only the poster grid scrolls. */}
       <PageToolbar>
-        <div className="px-4 pt-2 pb-1 max-w-[1600px] mx-auto flex items-center gap-1.5">
+        <div className="px-4 pt-2 pb-1 max-w-[1600px] mx-auto">
           <ItemCount count={browseQ.isLoading ? undefined : total} />
-          {viewToggle}
-          {/* Sort moved out of the filter sidebar to the row above the cards (S3), like the Feed. */}
-          <div className="ml-auto flex items-center gap-1.5">
-            <SortControl
-              options={sortOptions}
-              sort={sortState}
-              onChange={(next) => setSort(next ?? PLEX_SORT_FALLBACK)}
-              label={t("plex.filter.sort")}
-              ascLabel={t("plex.filter.dir.asc")}
-              descLabel={t("plex.filter.dir.desc")}
+          {/* The controls row sits directly above the grid: the applied-filter chips flow from the
+              left (overflowing to a "+N"/count pill so they never crowd the controls), while Sort +
+              the Discover/Browse toggle stay pinned to the right — the same layout as the Feed. */}
+          <div className="mt-1 flex items-center gap-2">
+            <ActiveFilterChips
+              filters={plexChips}
+              onClearAll={clearAllFilters}
+              className="flex-1"
             />
+            <div className="ml-auto flex shrink-0 items-center gap-1.5">{sortView}</div>
           </div>
         </div>
       </PageToolbar>
 
-      <ActiveFilterChips filters={plexChips} onClearAll={clearAllFilters} />
-
       {personCards.length > 0 && (
         <div className="mb-4 flex flex-wrap gap-3">
           {personCards.map((p) => (

frontend/src/components/PlexSidebar.tsx

@@ -13,7 +13,6 @@ import { type PanelItem } from "./PanelGroups";
 import SegmentedToggle from "./SegmentedToggle";
 import FilterChipGroup from "./FilterChipGroup";
 import Combobox, { type ComboboxOption } from "./Combobox";
-import { usePlexClearFilters } from "./usePlexActiveFilters";
 import { usePlex, usePlexActions } from "./PlexProvider";
 
 // The Plex module's left filter column — now the shared floating SidePanel with its filter groups
@@ -96,10 +95,8 @@ export default function PlexSidebar({ layout, setLayout, collapsed, onToggleColl
   // Scope and sort moved to the header / above-the-grid toolbar (S3); the panel badge now counts only
   // the filters that still live in this panel (expanded filters + watch-state).
   const activeCount = fCount + (show !== "all" ? 1 : 0);
-  const anyActive = activeCount > 0;
 
   const patch = (p: Partial<PlexFilters>) => setFilters({ ...filters, ...p });
-  const clearAll = usePlexClearFilters();
 
   const durBucketKey = DURATION_BUCKETS.find(
     (b) => (filters.durationMin ?? null) === b.min && (filters.durationMax ?? null) === b.max,
@@ -361,17 +358,9 @@ export default function PlexSidebar({ layout, setLayout, collapsed, onToggleColl
       layout={layout}
       setLayout={setLayout}
       items={items}
-      actions={
-        anyActive ? (
-          <button
-            onClick={clearAll}
-            className="inline-flex items-center gap-1 text-xs text-muted hover:text-accent transition px-1 whitespace-nowrap"
-          >
-            <X className="w-3.5 h-3.5" />
-            {t("plex.filter.clearAll")}
-          </button>
-        ) : undefined
-      }
+      // The Plex widgets are simple label + control rows now, not collapsible islands (matches the
+      // feed rail). The rail's own "Clear all" is dropped too — the chip row above the grid owns it.
+      collapsible={false}
     />
   );
 }