fix(ci): stabilize Electron smoke flakiness at its sources

The workspace cutter drop check waited a fixed 250ms before asserting
the populated cutter controls, but the drop triggers asynchronous IPC
and media probing, so loaded runners regularly lost that race and
failed with a misleading error. The check now polls the exact same UI
conditions with a bounded deadline before asserting. All window
screenshots in the cutter and workspace smokes carry an explicit
generous timeout because large two-times-DPR captures exceeded the
Playwright default under load. The focused Electron smoke and the
cutter media matrix additionally retry exactly once in both CI
workflows, mirroring the established packaging retries for transient
runner turbulence, and the CI contract now enforces those retries
instead of the former single-line steps.

.gitea/workflows/windows-ci.yml

@@ -67,11 +67,21 @@ jobs:
         run: npm run test:unit
         timeout-minutes: 10
       - name: Focused Electron smoke
-        run: npm run test:e2e:focused
-        timeout-minutes: 10
+        run: |
+          npm run test:e2e:focused
+          if ($LASTEXITCODE -ne 0) {
+            npm run test:e2e:focused
+            if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          }
+        timeout-minutes: 20
       - name: Cutter media matrix
-        run: node scripts/smoke-test-cutter-media-matrix.js
-        timeout-minutes: 10
+        run: |
+          node scripts/smoke-test-cutter-media-matrix.js
+          if ($LASTEXITCODE -ne 0) {
+            node scripts/smoke-test-cutter-media-matrix.js
+            if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
+          }
+        timeout-minutes: 20
       - name: Clean managed tools provision and repair
         run: npm run test:managed-tools-live
         timeout-minutes: 10