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/SegmentedToggle.tsx

@@ -44,7 +44,7 @@ export default function SegmentedToggle<T extends string>({
   const hintId = useId();
   const track = (
     <div
-      className={`inline-flex items-center rounded-full border border-border bg-card p-0.5 ${
+      className={`inline-flex items-center rounded-full border border-border bg-card p-px ${
         size === "md" ? "text-xs" : "text-3xs"
       }${fullWidth ? " w-full" : ""}`}
       role="group"
@@ -63,8 +63,10 @@ export default function SegmentedToggle<T extends string>({
           onClick={() => onChange(o.value)}
           title={o.title}
           aria-pressed={value === o.value}
-          className={`pill inline-flex items-center justify-center gap-1 rounded-full ${
-            size === "md" ? "px-2.5 py-1" : "px-2 py-0.5"
+          // A segment is the target: 24 (sm) / 28 (md), so the track lands on the ladder's 28 / 32
+          // with its 1px padding and edge (B1); 44 on a coarse pointer (A3).
+          className={`pill touch-target inline-flex items-center justify-center gap-1 rounded-full ${
+            size === "md" ? "h-7 px-2.5" : "h-6 px-2"
           }${fullWidth ? " flex-1" : ""}`}
         >
           {o.icon}