feat(ui): InlineAction for small text actions, with a 44 px touch floor

Thirty-three hand-rolled underlined text links and buttons (Open
schedule, Select all, View all, Retry, Learn more, the device-code copy
action, ...) carried three different focus rings, none on half of them,
and a 16 px target on a phone. They now render through one InlineAction
primitive: tone primary / muted / foreground, size xs / sm, a focus ring,
and min-h-11 on a coarse pointer so the desktop layout does not move. A
structural test refuses a new hand-rolled copy.

src/components/admin/module-availability-section.tsx

@@ -23,6 +23,7 @@ import {
 import type { ModuleKey } from "@/lib/modules/registry";
 import { SettingsToggle } from "./_shared";
 import { apiGet, apiPatch } from "@/lib/api/api-fetch";
+import { InlineAction } from "@/components/ui/inline-action";
 
 /**
  * v1.18.0 — operator-side panel for server-wide module availability, the
@@ -127,12 +128,11 @@ export function ModuleAvailabilitySection() {
                     onCheckedChange={() => {}}
                     disabled
                   />
-                  <Link
-                    href="/admin/coach"
-                    className="text-primary text-xs underline-offset-4 hover:underline"
-                  >
-                    {t("admin.section.coach.title")}
-                  </Link>
+                  <InlineAction asChild>
+                    <Link href="/admin/coach">
+                      {t("admin.section.coach.title")}
+                    </Link>
+                  </InlineAction>
                 </div>
               );
             }