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/buttonStyles.ts

@@ -68,7 +68,8 @@ const SIZES: Record<ButtonSize, string> = {
   sm: "h-7 px-2.5 text-sm gap-1.5 whitespace-nowrap",
   md: "h-8 px-3 text-sm gap-1.5 whitespace-nowrap",
   lg: "h-10 px-4 text-base gap-2 whitespace-nowrap",
-  none: "gap-1.5",
+  // No box of its own, but still a 24 target on a mouse (B1).
+  none: "gap-1.5 min-h-6",
 };
 
 // The font-weight is owned by each VARIANT, not by BASE: `link` wants semibold (that is what a text
@@ -151,10 +152,11 @@ export function buttonClass({
     pressed !== undefined && PRESSED,
     SIZES[size],
     size !== "none" && (round || variant === "media" ? "rounded-full" : "rounded-lg"),
-    // The coarse-pointer target (DESIGN.md A3) lives HERE, not in the call sites. A link variant is
-    // excluded on purpose — it is a run of text inside a sentence, and a 44px-tall inline link would
-    // wreck the paragraph it sits in rather than make anything easier to hit.
-    !isLinkVariant(variant) && "touch-target",
+    // The coarse-pointer target (DESIGN.md A3) lives HERE, not in the call sites — on every variant.
+    // The link variants were once excluded as "a run of text inside a sentence", but none is: every
+    // one stands on its own ("See all", "Forgot your passphrase?", a notification's action), and the
+    // E28 audit measured them at 16–20px on a tablet. Text inside a sentence is a plain <a>.
+    "touch-target",
     fullWidth && "w-full",
   );
 }