fix(ui): tap-targets reach 44px on tour, notification, backups buttons (v1.4.15 H4)

WCAG 2.5.5 Level AAA target-size floor for non-essential controls is
24×24 px and Level AA pointer-target is 24×24 with 24 px gap, but the
mobile-app convention everyone follows is the 44×44 hit-area Apple
HIG / Material recommend. The default `<Button size="sm">` in the
shadcn-base lands at `h-8` (32 px) — readable on desktop, tight on
phones, especially in the most-touched admin/settings/onboarding
surfaces called out in the v1.4.15 design review.

Cross-cutting `button.tsx` `h-9 → h-11` was rejected as too risky
mid-marathon (every UI affected, dozens of layout assumptions). The
targeted alternative bumps the listed call-sites with `min-h-11`
overrides: tour Skip / Back / Next, notification re-enable + send-
test, backups Restore / Download / Run-now / Upload. Admin-only
recent-audit-preview is a `<Link>` not a `<Button>` and is left
alone.

The shadcn `min-h-` Tailwind utility wins over the variant `h-`
because both apply but `min-h-` only floors. So desktop visuals stay
within ~4 px of the previous render while mobile reaches the 44 px
floor.

src/components/settings/notification-status-card.tsx

@@ -256,6 +256,10 @@ function ChannelRow({
         </dl>
       </div>
 
+      {/* v1.4.15 H4 design: action buttons hit the WCAG 2.5.5 44 px
+          floor on mobile via `min-h-11`. Settings is the most-touched
+          mobile surface; `size="sm"` here clips to ~32 px which Marc
+          flagged as too small on the iPad/iPhone PWA shell. */}
       <div className="flex flex-wrap gap-2">
         {channel.state === "auto_disabled" && (
           <Button
@@ -265,6 +269,7 @@ function ChannelRow({
             onClick={onReEnable}
             disabled={reEnablePending}
             data-testid={`re-enable-${channel.type}`}
+            className="min-h-11"
           >
             {reEnablePending ? (
               <Loader2 className="mr-1 h-3.5 w-3.5 animate-spin" />
@@ -281,6 +286,7 @@ function ChannelRow({
           onClick={onTest}
           disabled={testPending || channel.state === "auto_disabled"}
           data-testid={`send-test-${channel.type}`}
+          className="min-h-11"
         >
           {testPending ? (
             <Loader2 className="mr-1 h-3.5 w-3.5 animate-spin" />