implicit: implement Implicit 10.3 - add optional test check to pre-commit hook

- Added optional test check to pre-commit hook
- Runs unit tests only (fast, not E2E)
- Can be skipped with SKIP_TESTS=1 environment variable
- Blocks commits with failing tests
- Provides helpful error messages and tips
- Keeps pre-commit hook fast by only running unit tests

.husky/pre-commit

@@ -19,3 +19,15 @@ cd apps/web && npm run lint 2>&1 | grep -q "error" && {
   echo "💡 Tip: Run 'npm run lint:fix' to automatically fix some issues."
   exit 1
 } || true
+
+# Implicit 10.3: Test checking (optional, fast unit tests only)
+# Skip if SKIP_TESTS environment variable is set (for quick commits)
+# Only runs unit tests (not E2E) to keep it fast
+if [ -z "$SKIP_TESTS" ]; then
+  cd apps/web && npm test -- --run 2>&1 | grep -q "FAIL" && {
+    echo "❌ Tests failed. Please fix failing tests before committing."
+    echo "💡 Tip: Run 'npm test' to see all test failures."
+    echo "💡 Tip: Set SKIP_TESTS=1 to skip tests for this commit (not recommended)."
+    exit 1
+  } || true
+fi