feat(design): every button on its family, the chip primitive, the lint rule (E28 S3b2)

The second half of the button sweep: the remaining hand-rolled buttons in
feature components, the design lab and the components/ui composites now
stand on Button, IconButton, Pressable, Chip or DragHandle.

- Chip + DismissibleChip (filter / token / tag / suggest / ghost, 24px
  floor, 44 on touch) replace five chip geometries; FilterChipGroup
  renders Chips; overflow lanes measure a mirror painted by chipClass.
- The Plex control row is IconButton's player rung (36, 20px glyph,
  round, overlay; 44 on touch); the YT modal bar is on the sm rung with
  pressed cycle toggles and names that survive a folded label.
- New variants: IconButton ghost-accent, danger-soft; Button warn on a
  new state-warn utility. The .btn-{tone} recipes and btnCls are gone.
- Fixed on the way: membership rows (collection editor, Plex playlist
  add) announce checked/mixed; a one-letter tag chip was 21px wide;
  descriptionLinks moved out of lib/ (it renders components).
- local/button-primitive: a raw <button>/<FocusSafeButton> outside the
  control-primitive files is a lint error (contract-tested, seen red).

frontend/src/components/PersonalViewsModal.tsx

@@ -1,6 +1,6 @@
 import { useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
-import { BookmarkPlus, Check, Play, Save, Star, Trash2, X } from "lucide-react";
+import { BookmarkPlus, Check, Play, Save, Star, Trash2 } from "lucide-react";
 import {
   closestCenter,
   DndContext,
@@ -23,6 +23,7 @@ import UndoToolbar from "./ui/UndoToolbar";
 import { useSortableA11y, useSortableItem } from "./ui/sortableA11y";
 import { DragHandle } from "./ui/DragHandle";
 import { Pressable } from "./ui/Pressable";
+import { DismissibleChip } from "./ui/Chip";
 
 // Master–detail manager for saved ("personal") views: the left column lists the views (drag to
 // reorder) plus a "save the current filters" input; the right column shows the selected view's name
@@ -259,20 +260,14 @@ export default function PersonalViewsModal() {
               ) : (
                 <div className="flex flex-wrap gap-1.5">
                   {captured.map((f) => (
-                    <span
+                    <DismissibleChip
                       key={f.key}
-                      className="group inline-flex items-center gap-1 rounded-full bg-accent/10 py-0.5 pl-2 pr-1 text-2xs text-accent"
+                      size="xs"
+                      onDismiss={f.remove}
+                      dismissLabel={t("feed.chips.remove", { name: f.label })}
                     >
                       {f.label}
-                      <button
-                        onClick={f.remove}
-                        title={t("feed.chips.remove", { name: f.label })}
-                        aria-label={t("feed.chips.remove", { name: f.label })}
-                        className="rounded-full p-0.5 opacity-60 transition hover:bg-accent/20 hover:opacity-100"
-                      >
-                        <X className="h-3 w-3" />
-                      </button>
-                    </span>
+                    </DismissibleChip>
                   ))}
                 </div>
               )}