feat(ui): human-confirmed status suggestion banner

When a job workspace opens, loads /status-suggestion and shows a
dismissible banner when a recent inbound email implies a status move
("This email looks like a move to Interview"). Applying it PATCHes the
status; nothing changes without the user's click.

- StatusSuggestion type + load-on-open effect + apply handler
- warning-toned banner shown above tab content on any tab
- EN/NB translations; README endpoint docs
- 2 frontend tests; full suite green (21 suites / 48 tests)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

job-tracker-ui/src/types.ts

@@ -138,6 +138,16 @@ export interface MatchScoreSectionCoverage {
   total: number;
 }
 
+export interface StatusSuggestion {
+  hasSuggestion: boolean;
+  suggestedStatus?: string | null;
+  currentStatus?: string | null;
+  signal?: string | null;
+  confidence?: string | null;
+  messageDate?: string | null;
+  messageSubject?: string | null;
+}
+
 export interface MatchScore {
   score: number;
   band: string;