feat(feed): toolbar pills named by a glyph, Sort and View on the filters' row

The watch-state, content-type and sort pills on the feed, a channel page and
Plex Browse show a glyph where their group's word was; the word moves to the
tooltip and stays in the accessible name. Sort + View end the toolbar's row
instead of a row of their own, the chip row shows only with a chip, and a
channel page drops the count pill its header already carries.

Also logs the docked bar's glyph-only decision in DESIGN.md.

frontend/src/components/ui/FilterSelect.tsx

@@ -1,6 +1,6 @@
-import { useState } from "react";
+import { useState, type ReactNode } from "react";
 import { MenuCheck } from "./MenuCheck";
-import { SelectTrigger } from "./SelectTrigger";
+import { GroupGlyph, SelectTrigger } from "./SelectTrigger";
 import { PopoverItem, PopoverSurface } from "./AnchoredPopover";
 import { useAnchoredPopover } from "./anchoredPopoverHooks";
 import { SURFACE } from "./surfaces";
@@ -27,6 +27,10 @@ export interface FilterSelectProps {
   /** Show only the value on the trigger — for a form row whose own caption already names the field.
    *  The label still names the control and its menu for assistive tech. */
   hideLabel?: boolean;
+  /** A glyph that names the group in place of its word, for a toolbar where the value says enough
+   *  once the group is recognisable (the feed's watch state: an eye). The word moves to the tooltip
+   *  and stays in the accessible name. */
+  icon?: ReactNode;
   options: readonly FilterSelectOption[];
   selected: string[];
   onChange: (next: string[]) => void;
@@ -46,6 +50,7 @@ export default function FilterSelect({
   multiple = false,
   requireOne = true,
   hideLabel = false,
+  icon,
   testId,
 }: FilterSelectProps) {
   const [open, setOpen] = useState(false);
@@ -95,7 +100,9 @@ export default function FilterSelect({
       <SelectTrigger
         context="toolbar"
         open={open}
-        label={hideLabel ? undefined : label}
+        label={hideLabel || icon ? undefined : label}
+        icon={icon && <GroupGlyph>{icon}</GroupGlyph>}
+        title={icon ? label : undefined}
         ref={setReference}
         {...pop.getReferenceProps()}
         data-testid={testId}

frontend/src/components/ui/SelectTrigger.tsx

@@ -12,6 +12,16 @@ import { FocusSafeButton } from "./FocusSafeButton";
 // the pills' faint edge, its label naming it (owner decision F14). Both hover by the accent edge. Open is
 // the accent edge and the chevron turned over. The popover wiring
 // (ref, `getReferenceProps`, the accessible name carrying the value) is the caller's.
+/** A toolbar trigger's group glyph in place of its "Label:" word (FilterSelect's and SortControl's
+ *  `icon`): muted like the word, and silent — the trigger's accessible name and tooltip say it. */
+export function GroupGlyph({ children }: { children: ReactNode }) {
+  return (
+    <span aria-hidden="true" className="flex shrink-0 text-muted [&>svg]:size-3.5">
+      {children}
+    </span>
+  );
+}
+
 export const SelectTrigger = forwardRef<
   HTMLButtonElement,
   ButtonHTMLAttributes<HTMLButtonElement> & {

frontend/src/components/ui/SortControl.tsx

@@ -1,7 +1,7 @@
 import { useState, type ReactNode } from "react";
 import { ArrowDown, ArrowUp } from "lucide-react";
 import { MenuCheck } from "./MenuCheck";
-import { SelectTrigger } from "./SelectTrigger";
+import { GroupGlyph, SelectTrigger } from "./SelectTrigger";
 import { pickSort, type SortOption, type SortState } from "../../lib/columnSort";
 import { PopoverItem, PopoverSurface } from "./AnchoredPopover";
 import { useAnchoredPopover } from "./anchoredPopoverHooks";
@@ -27,6 +27,7 @@ export default function SortControl({
   descLabel,
   defaultLabel,
   trailing,
+  icon,
 }: {
   options: SortOption[];
   sort: SortState;
@@ -40,6 +41,9 @@ export default function SortControl({
   defaultLabel?: string;
   /** Rendered in the panel footer beside the direction segment (feed reshuffle, playlists dirty-first). */
   trailing?: ReactNode;
+  /** A glyph in place of the visible "Sort:" prefix (FilterSelect's `icon`): the label moves to the
+   *  tooltip and stays in the accessible name. */
+  icon?: ReactNode;
 }) {
   const [open, setOpen] = useState(false);
   const pop = useAnchoredPopover({
@@ -71,7 +75,9 @@ export default function SortControl({
       <SelectTrigger
         context="toolbar"
         open={open}
-        label={label}
+        label={icon ? undefined : label}
+        icon={icon && <GroupGlyph>{icon}</GroupGlyph>}
+        title={icon ? label : undefined}
         ref={setReference}
         {...pop.getReferenceProps()}
         // Carry the active sort key AND direction in the accessible name (the visible arrow is