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/tableHeader.tsx

@@ -11,6 +11,7 @@ import { useStickyTop } from "./stickyTop";
 import { Button } from "./Button";
 import { IconButton } from "./IconButton";
 import { Pressable } from "./Pressable";
+import { Input } from "./Input";
 
 // The column-header machinery — the sortable header row with its filter funnel + popover — lifted
 // OUT of DataTable so a non-DataTable body can render under the same headers. The column contract
@@ -95,12 +96,13 @@ function FilterFunnel<T>({
         className="glass-menu w-52 rounded-xl p-2 animate-[popIn_0.16s_ease]"
       >
         {f.kind === "text" && (
-          <input
+          <Input
+            className="w-full"
+            size="sm"
             ref={inputRef}
             value={(value as string) ?? ""}
             onChange={(e) => onApply(col.key, e.target.value)}
             placeholder={col.header}
-            className="w-full bg-surface border border-border rounded-md px-2 py-1 text-xs focus:outline-hidden focus:ring-2 focus:ring-accent/40"
           />
         )}
         {f.kind === "select" && (