fix: exclude test files from tsconfig.app.json to resolve TS2304 build error

P0 F-01: Frontend build was failing with "Cannot find name 'beforeEach'"
because test files were being compiled by tsconfig.app.json which lacked
vitest globals. Added exclude patterns to tsconfig.app.json.

Updated PROJECT_REAL_COMPLETION_REVIEW_2026-04-10.md to reflect fix.

frontend/admin/tsconfig.app.json

@@ -30,5 +30,6 @@
     "noFallthroughCasesInSwitch": true,
     "noUncheckedSideEffectImports": true
   },
-  "include": ["src"]
+  "include": ["src"],
+  "exclude": ["src/**/*.test.tsx", "src/**/*.test.ts", "src/**/*.spec.tsx", "src/**/*.spec.ts"]
 }