test(S01/T01): Added a job-scoped Gmail matching contract with backend-…

- JobTrackerApi/Controllers/GmailController.cs
- JobTrackerApi/Services/GmailOAuthService.cs
- JobTrackerApi.Tests/GmailControllerTests.cs
- .gsd/milestones/M001/slices/S01/S01-PLAN.md
- .gsd/KNOWLEDGE.md

.gsd/milestones/M001/slices/S01/tasks/T03-SUMMARY.md

@@ -0,0 +1,39 @@
+---
+title: T03 summary
+status: done
+files:
+  - job-tracker-ui/src/components/JobDetailsDialog.tsx
+  - job-tracker-ui/src/components/Correspondence.tsx
+  - job-tracker-ui/src/types.ts
+  - job-tracker-ui/src/correspondence-gmail-import.test.tsx
+verification:
+  - npm ci (job-tracker-ui)
+  - CI=true npm --prefix job-tracker-ui test -- --watch=false --runTestsByPath src/correspondence-gmail-import.test.tsx
+---
+
+Wired the job-aware Gmail matching contract into the actual job workspace UI.
+
+What changed:
+- `job-tracker-ui/src/types.ts`
+  - added frontend contracts for job-aware Gmail matches, match reasons, import results, and enriched correspondence metadata
+- `job-tracker-ui/src/components/JobDetailsDialog.tsx`
+  - now passes the loaded `job` into `Correspondence` so the Gmail tab can stay job-aware without another job fetch
+- `job-tracker-ui/src/components/Correspondence.tsx`
+  - replaced client-side Gmail ranking as the primary workflow
+  - Gmail tab now calls `/gmail/job-candidates`
+  - shows confidence, score, match reasons, and already-linked state
+  - preserves manual query override via the same job-aware endpoint
+  - refreshes correspondence plus Gmail candidate state after single-message and thread imports
+  - renders persisted Gmail metadata (`ExternalThreadId`, `ExternalFrom`, `ExternalTo`) in the correspondence view
+- `job-tracker-ui/src/correspondence-gmail-import.test.tsx`
+  - verifies ranked Gmail suggestions render with visible reasons/confidence
+  - verifies single-message import refreshes the same job’s correspondence view
+  - verifies manual search override is sent as `queryOverride`
+
+Verification:
+- frontend dependencies were installed with `npm ci` in `job-tracker-ui`
+- focused React test passed:
+  - `CI=true npm --prefix job-tracker-ui test -- --watch=false --runTestsByPath src/correspondence-gmail-import.test.tsx`
+
+Notes:
+- The Gmail tab now treats the backend as the source of truth for ranking while keeping the manual search field as a fallback override.