fix(design): claim audit part 1b — whole-row switches, the field-family edge, state-layer hovers, icon links, reason-disabled controls, 24/44 targets (E28)

- F12 (owner: A): SwitchRow, the whole settings row toggles; a Config boolean toggles from its title
  and hint (a label pointed at the switch).
- F14 (owner: B): the form dropdown trigger wears the field frame (see-through, the >= 3:1 edge);
  labelled pills keep the faint edge and the accent-edge hover. DESIGN says so, with log rows.
- F6: ~15 bg-card / bg-border / opacity hovers onto the B3 state layer; a lint rule (HOVER_SWAP)
  refuses the swap, contract-tested.
- F10: bare 14px icon links onto IconLink / LinkButton; a local lint rule refuses a glyph-only <a>.
- F13: reason-disabled controls are aria-disabled (Users, Channels backfill, Discovery, Scheduler
  runs, Config tests); FocusSafeButton now swallows the click of a caller's aria-disabled; the
  Config tests say why while dirty (testDirty, HU/EN).
- F5/F11: every control measured live at 24 (mouse) and 44 (coarse) across every page; touch-target
  is a utility that wins over a caller's min-h-6; link variants carry it too; SegmentedToggle,
  Tabs, NavRail, menu rows, PriorityStepper, sliders, CheckRow, InnerInput, card links and the rest.
- F9: DismissibleChip's label reaches the chip's 24; the Combobox chips are DismissibleChips.
- F15: the "+N" / "More..." open state worded as it renders.

frontend/src/components/ui/form.dom.test.tsx

@@ -5,7 +5,7 @@
 import { afterEach, describe, expect, it, vi } from "vitest";
 import { cleanup, fireEvent, render, screen } from "@testing-library/react";
 
-import { Switch } from "./form";
+import { Switch, SwitchRow } from "./form";
 
 afterEach(cleanup);
 
@@ -27,3 +27,25 @@ describe("Switch", () => {
     expect(screen.getByRole("switch")).toBeTruthy();
   });
 });
+
+describe("SwitchRow", () => {
+  // Owner decision F12: a settings row toggles from its whole surface, as on iOS and in Material.
+  it("toggles from its text as well as from the switch, once per click", () => {
+    const onChange = vi.fn();
+    render(
+      <SwitchRow label="Dark mode" hint="Easier on the eyes" checked={false} onChange={onChange} />,
+    );
+    fireEvent.click(screen.getByText("Dark mode"));
+    expect(onChange).toHaveBeenCalledTimes(1);
+    fireEvent.click(screen.getByRole("switch", { name: "Dark mode" }));
+    expect(onChange).toHaveBeenCalledTimes(2);
+    expect(onChange).toHaveBeenLastCalledWith(true);
+  });
+
+  it("does nothing from its text while disabled", () => {
+    const onChange = vi.fn();
+    render(<SwitchRow label="Sync" checked onChange={onChange} disabled />);
+    fireEvent.click(screen.getByText("Sync"));
+    expect(onChange).not.toHaveBeenCalled();
+  });
+});