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

CLAUDE.md

@@ -96,6 +96,7 @@ CQRS, a repository/DI framework, a router library, a generic CRUD-router factory
 | FE keyboard shortcut                 | a row in `lib/keymap.ts` + `dispatch()`                                                                                 | a private `keydown` listener with its own key literals                               |
 | FE list/grid keys                    | `NavGrid`/`keyboardNav` + `navItemAttrs` + `data-nav-open`                                                              | a private arrow-key / roving-tabindex handler                                        |
 | FE view push (history)               | `rememberNavPosition()` right before `history.pushState`                                                                | a push that forgets: Back strands focus on `<body>`                                  |
+| FE text field / checkbox / slider    | `ui/Input` · `Textarea` · `InnerInput` in a `fieldClass` frame · `Checkbox`/`CheckRow` · `Slider`                       | a raw `<input>`/`<textarea>` anywhere but those primitives (lint-enforced)           |
 | FE control                           | `SegmentedToggle`; a long or user's list: `FilterSelect`                                                                | a native `<select>` (lint-enforced)                                                  |
 | FE loading/empty/error               | `QueryState` / `StateMessage`                                                                                           | ad-hoc conditionals                                                                  |
 | FE failed write                      | `meta.failTitle`, else `notifyActionError(err, title)`                                                                  | a bare `catch {}` or `notify()` with no error attached                               |