feat(design): the field family, the dropdown trigger, native controls, the no-raw-input lint rule (E28 S3c)

- ui/Input, Textarea, InnerInput + fieldClass (A4): the >= 3:1 edge, a 2px accent
  focus edge, the danger edge for invalid, md/sm/xs/heading rungs, 1rem and 44 on touch
- ui/SelectTrigger (A5): SortControl, FilterSelect, the view switcher and the date
  filter on one trigger, a pill in a toolbar, r8 in a form
- ui/NativeControls (A6): Checkbox, CheckRow, Slider, ColorInput
- every raw input swept (~100 sites); inputCls retired; local/input-primitive
- useReturnFocus: an in-place editor hands the focus back to its trigger on
  Enter/Escape (the playlist and Plex title renames, the priority number);
  the Plex playlist rename gains Escape and an accessible name
- back to top: a round 48 FAB (owner decision); DESIGN.md A2 and the log

frontend/src/components/ui/CommandPalette.tsx

@@ -1,3 +1,4 @@
+import clsx from "clsx";
 import { useEffect, useId, useMemo, useRef, useState, type ReactNode } from "react";
 import { useTranslation } from "react-i18next";
 import { Search } from "lucide-react";
@@ -5,6 +6,8 @@ import Modal from "./Modal";
 import { closeTopOverlayThenRun } from "../../lib/history";
 import { pageStep, pageTarget } from "../../lib/listPaging";
 import { Pressable } from "./Pressable";
+import { InnerInput } from "./Input";
+import { fieldClass } from "./fieldStyles";
 
 // The app's jump-to bar: one text field over every place you can go and every app-wide thing you can
 // do, opened with Ctrl/Cmd+K. It is the "one-layer operation" half of E10 — reaching a channel three
@@ -191,9 +194,11 @@ function CommandPaletteBody({ onClose, groups }: { onClose: () => void; groups:
 
   return (
     <Modal title={t("palette.title")} onClose={onClose} maxWidth="max-w-xl" placement="top">
-      <div className="flex items-center gap-2 rounded-xl border border-border bg-surface px-3 py-2">
+      <div
+        className={clsx(fieldClass({ size: "free" }), "flex h-10 items-center gap-2 px-3 text-sm")}
+      >
         <Search className="w-4 h-4 shrink-0 text-muted" />
-        <input
+        <InnerInput
           autoFocus
           value={query}
           onChange={(e) => {
@@ -210,7 +215,6 @@ function CommandPaletteBody({ onClose, groups }: { onClose: () => void; groups:
           aria-expanded={flat.length > 0}
           aria-controls={listId}
           aria-activedescendant={activeId ? `${listId}-${activeId}` : undefined}
-          className="w-full bg-transparent text-sm outline-hidden placeholder:text-muted"
         />
       </div>