feat(dashboard): GuruConnect v2 Support Codes view

Generate, list, and cancel attended-support codes (XXX-XXX-XXX), built
on the v2 codes API and existing UI primitives.

- Codes table: code in mono, status badge (pending+pulse/connected/
  completed/cancelled), bound client/machine, created-by, created
  (relative + absolute tooltip). Sticky header, skeleton load,
  actionable empty/error states.
- Generate opens a focused reveal modal showing the code large in
  JetBrains Mono with copy and a read-aloud instruction; the code is
  announced character-by-character for screen readers. Mint is ref-
  guarded so it creates exactly one code per open (no StrictMode dupe).
- Cancel via confirm dialog (POST /api/codes/:code/cancel), disabled for
  non-cancellable statuses; invalidates the codes query. List polls 7s.
- Shared API client now tolerates non-JSON 200 bodies, so the cancel
  endpoint's plain-text "Code cancelled" success no longer surfaces as a
  failure. Error-envelope handling unchanged.

Passed Code Review (no blockers after fixes) and local gates
(tsc/lint/build green).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

dashboard/src/components/ui/status.ts

@@ -46,3 +46,43 @@ export function consentLabel(state: string): string {
       return state;
   }
 }
+
+/**
+ * Map a support-code lifecycle status to a tone. `pending` is the live,
+ * waiting-to-be-redeemed state and gets the same `warn` pulse the
+ * awaiting-consent state uses — it reads as "active, watch this". A redeemed
+ * (`connected`) code is a positive terminal-for-the-tech outcome -> `ok`.
+ * `completed`/`cancelled` are spent and read as muted `neutral`.
+ */
+export function codeTone(status: string): StatusTone {
+  switch (status) {
+    case "pending":
+      return "warn";
+    case "connected":
+      return "ok";
+    case "completed":
+    case "cancelled":
+    default:
+      return "neutral";
+  }
+}
+
+/**
+ * Human label for a support-code status. Next to `codeTone` so wording and
+ * color never drift. `pending` is phrased as the active wait (the tech is
+ * watching for the end user to redeem it).
+ */
+export function codeLabel(status: string): string {
+  switch (status) {
+    case "pending":
+      return "Awaiting redeem";
+    case "connected":
+      return "Redeemed";
+    case "completed":
+      return "Completed";
+    case "cancelled":
+      return "Cancelled";
+    default:
+      return status;
+  }
+}