diff --git a/.claude/project-context.md b/.claude/project-context.md
index 2b00266..0039d0a 100644
--- a/.claude/project-context.md
+++ b/.claude/project-context.md
@@ -251,6 +251,10 @@ Take a green SonarQube job as weak evidence. It exits success on a partially-fai
 - **Unit tests**: `cd backend && npm run test:unit` — no DB required
 - **Integration tests**: `npm run db:test:up` (disposable tmpfs Postgres via `docker-compose.test.yml`) → `npm run migrate:up` → `npm run test:integration` → `npm run db:test:down`
 - **E2e (Playwright)**: needs backend running against a migrated DB; `cd frontend && npm run test:e2e`
+- **Coverage**: `npm run test:unit:cov` and `npm run test:integration:cov` in `backend` write `coverage/unit/lcov.info` and `coverage/integration/lcov.info` — separate directories because jest writes `coverage/lcov.info` by default and the second run would otherwise overwrite the first. Frontend coverage is `npm run test:e2e:cov` then `npm run coverage:report`. Added in #61.
+- **Frontend coverage comes from Playwright through an istanbul-instrumented dev server**, so read it with suspicion: istanbul marks a line covered when the browser ran it, meaning a component rendered during an end-to-end test reports as covered with nothing asserting anything about it. Backend coverage, coming from tests that assert on responses, means considerably more per percentage point. The 80% gate on new code is correspondingly easier to clear on frontend changes.
+- **Instrumentation is gated behind `COVERAGE=true`** and must stay that way — an instrumented bundle is larger, slower, and publishes the source structure through `window.__coverage__`. The Dockerfile runs a plain `npm run build`, which never sets it. `vite-plugin-istanbul` is also loaded by dynamic import because it is ESM-only while `vite.config.ts` evaluates as CommonJS; a static import fails the build outright.
+- **`npm run coverage:report` fails when nothing was collected** rather than writing an empty report. If Playwright reuses an uninstrumented dev server every test still passes while gathering nothing, and the resulting 0% reads as "the tests stopped covering things" rather than "collection was never switched on".
 - CI (`tests.yml`) runs all three as separate jobs, each posting a pass/fail summary to Gitea's job Summary tab. The `frontend-e2e` job runs `node migrate.js up` against a Postgres service container — same migration mechanism as everywhere else, no schema duplication anywhere in the project anymore.
 
 ### The local Node version will not run the integration or e2e suites
diff --git a/.gitea/workflows/sonarqube.yml b/.gitea/workflows/sonarqube.yml
index 113c27c..2462253 100755
--- a/.gitea/workflows/sonarqube.yml
+++ b/.gitea/workflows/sonarqube.yml
@@ -10,6 +10,44 @@ on:
 jobs:
   sonarqube:
     runs-on: ubuntu-latest
+    # The scanner needs every coverage report in one workspace, so the suites run
+    # here rather than being passed between jobs as artifacts. That makes this the
+    # long job. The timeout is a stop, not a budget: the integration suite has
+    # hung after completing before (see backend-integration.yml) and cost three
+    # hours of runner time.
+    timeout-minutes: 30
+    services:
+      postgres:
+        image: postgres:16
+        env:
+          POSTGRES_USER: redefined_test
+          POSTGRES_PASSWORD: redefined_test
+          POSTGRES_DB: redefined_test
+        options: >-
+          --health-cmd "pg_isready -U redefined_test"
+          --health-interval 5s
+          --health-timeout 5s
+          --health-retries 10
+    env:
+      # Consumed by the integration suite's setup files.
+      TEST_PGHOST: postgres
+      TEST_PGPORT: 5432
+      TEST_PGUSER: redefined_test
+      TEST_PGPASSWORD: redefined_test
+      TEST_PGDATABASE: redefined_test
+      # Consumed by the backend process the end-to-end run drives.
+      PGHOST: postgres
+      PGPORT: 5432
+      PGUSER: redefined_test
+      PGPASSWORD: redefined_test
+      PGDATABASE: redefined_test
+      PORT: 3000
+      DEMO_MODE: 'true'
+      UPLOADS_DIR: /tmp/redefined-uploads
+      # NODE_ENV is deliberately unset: `npm install` omits devDependencies when
+      # NODE_ENV=production, which strips tsc/vite/@playwright/test and breaks the
+      # build. It would also flip the session cookie to Secure, which the e2e run
+      # serves over plain http.
     steps:
       - name: Checkout
         uses: actions/checkout@v4
@@ -37,17 +75,61 @@ jobs:
         run: npm run build
         working-directory: frontend
 
-      # frontend/tsconfig.sonar.json is a standalone copy that cannot use
-      # `extends`, so it can drift. Drift does not fail the scan — it silently
-      # returns to skipping the frontend while still reporting success, which is
-      # the failure #67 was about. Checked before scanning, so the scan is never
-      # the thing that discovers it.
       - name: Check the Sonar tsconfig has not drifted
         run: node scripts/check-sonar-tsconfig.js
 
-      # Scan settings live in sonar-project.properties at the repo root, so a
-      # local scan and this one analyse the same thing. Only the host and token
-      # come from secrets.
+      - name: Run migrations
+        run: node migrate.js up
+        working-directory: backend
+
+      - name: Backend unit tests with coverage
+        run: npm run test:unit:cov
+        working-directory: backend
+
+      # Covers everything in src/routes, which the unit suite does not touch —
+      # without this the backend reports around 11% rather than the ~73% it
+      # actually has.
+      - name: Backend integration tests with coverage
+        run: npm run test:integration:cov
+        working-directory: backend
+
+      - name: Start backend for the end-to-end run
+        run: |
+          mkdir -p /tmp/redefined-uploads
+          node dist/server.js > /tmp/backend.log 2>&1 &
+          for i in $(seq 1 30); do
+            if node -e "require('http').get('http://localhost:3000/api/config', r => process.exit(r.statusCode === 200 ? 0 : 1)).on('error', () => process.exit(1))"; then
+              echo "Backend ready after ${i}s"
+              exit 0
+            fi
+            sleep 1
+          done
+          echo "Backend did not become ready within 30s:"
+          cat /tmp/backend.log
+          exit 1
+        working-directory: backend
+
+      - name: Install Playwright browsers
+        run: npx playwright install --with-deps chromium
+        working-directory: frontend
+
+      # Runs against an istanbul-instrumented dev server, which is what produces
+      # window.__coverage__ for the fixture to collect.
+      - name: Frontend end-to-end tests with coverage
+        run: npm run test:e2e:cov
+        working-directory: frontend
+
+      - name: Backend log
+        if: failure()
+        run: cat /tmp/backend.log
+
+      # Fails when nothing was collected rather than writing an empty report. An
+      # uninstrumented dev server lets every test pass while gathering nothing,
+      # and the resulting 0% reads as "the tests stopped covering things".
+      - name: Merge frontend coverage
+        run: npm run coverage:report
+        working-directory: frontend
+
       - name: SonarQube Scan
         uses: sonarsource/sonarqube-scan-action@v4
         env:
diff --git a/.gitignore b/.gitignore
index b31eefc..a7f8048 100755
--- a/.gitignore
+++ b/.gitignore
@@ -11,3 +11,4 @@ test-results/
 .env
 .superpowers/
 .scannerwork/
+.nyc_output/
diff --git a/backend/jest.integration.config.js b/backend/jest.integration.config.js
index 0bd1886..a9555dc 100755
--- a/backend/jest.integration.config.js
+++ b/backend/jest.integration.config.js
@@ -2,6 +2,15 @@ module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
   testMatch: ['<rootDir>/tests/integration/**/*.test.ts'],
+  // Separate directory per suite: jest writes coverage/lcov.info by default, so
+  // running unit and integration in the same job would have the second silently
+  // overwrite the first. SonarQube is pointed at both and merges them.
+  coverageDirectory: '<rootDir>/coverage/integration',
+  coverageReporters: ['lcov', 'text-summary'],
+  // Every source file, not just the ones a test happens to import — otherwise an
+  // entirely untested file is absent from the report rather than reported as 0%,
+  // which flatters the total.
+  collectCoverageFrom: ['<rootDir>/src/**/*.ts'],
   setupFiles: ['<rootDir>/tests/integration/setup/env.setup.ts'],
   globalSetup: '<rootDir>/tests/integration/setup/globalSetup.ts',
   testTimeout: 20000
diff --git a/backend/jest.unit.config.js b/backend/jest.unit.config.js
index dc06d3d..5e6a140 100755
--- a/backend/jest.unit.config.js
+++ b/backend/jest.unit.config.js
@@ -1,5 +1,14 @@
 module.exports = {
   preset: 'ts-jest',
   testEnvironment: 'node',
-  testMatch: ['<rootDir>/tests/unit/**/*.test.ts']
+  testMatch: ['<rootDir>/tests/unit/**/*.test.ts'],
+  // Separate directory per suite: jest writes coverage/lcov.info by default, so
+  // running unit and integration in the same job would have the second silently
+  // overwrite the first. SonarQube is pointed at both and merges them.
+  coverageDirectory: '<rootDir>/coverage/unit',
+  coverageReporters: ['lcov', 'text-summary'],
+  // Every source file, not just the ones a test happens to import — otherwise an
+  // entirely untested file is absent from the report rather than reported as 0%,
+  // which flatters the total.
+  collectCoverageFrom: ['<rootDir>/src/**/*.ts']
 };
diff --git a/backend/package.json b/backend/package.json
index 35c9eef..fe3da80 100755
--- a/backend/package.json
+++ b/backend/package.json
@@ -11,8 +11,10 @@
     "test": "npm run test:unit",
     "test:unit": "jest -c jest.unit.config.js",
     "test:unit:json": "jest -c jest.unit.config.js --json --outputFile=unit-results.json",
+    "test:unit:cov": "jest -c jest.unit.config.js --coverage",
     "test:integration": "jest -c jest.integration.config.js --runInBand",
     "test:integration:json": "jest -c jest.integration.config.js --runInBand --json --outputFile=integration-results.json",
+    "test:integration:cov": "jest -c jest.integration.config.js --runInBand --coverage --forceExit",
     "db:test:up": "docker compose -f docker-compose.test.yml up -d",
     "db:test:down": "docker compose -f docker-compose.test.yml down -v",
     "migrate:up": "node migrate.js up",
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index ab50d7b..c035a9c 100644
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -24,15 +24,18 @@
         "@types/react": "^18.3.3",
         "@types/react-dom": "^18.3.0",
         "@vitejs/plugin-react": "^4.3.1",
+        "cross-env": "^10.1.0",
         "eslint": "^9.39.5",
         "eslint-plugin-jsx-a11y": "^6.10.2",
         "eslint-plugin-react-hooks": "^7.1.1",
         "eslint-plugin-sonarjs": "^4.2.0",
         "globals": "^17.11.0",
+        "nyc": "^18.0.0",
         "pg": "^8.23.0",
         "typescript": "^5.5.4",
         "typescript-eslint": "^8.67.0",
-        "vite": "^5.4.0"
+        "vite": "^5.4.0",
+        "vite-plugin-istanbul": "^6.0.2"
       }
     },
     "node_modules/@ant-design/colors": {
@@ -406,6 +409,13 @@
       "resolved": "https://registry.npmjs.org/@emotion/unitless/-/unitless-0.7.5.tgz",
       "integrity": "sha512-OWORNpfjMsSSUBVrRBVGECkhWcULOAJz9ZW8uK9qgxD+87M7jHRcvh/A96XXNhXTLmKcoYSQtBEX7lHMO7YRwg=="
     },
+    "node_modules/@epic-web/invariant": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/@epic-web/invariant/-/invariant-1.0.0.tgz",
+      "integrity": "sha512-lrTPqgvfFQtR/eY/qkIzp98OGdNJu0m5ji3q/nJI8v3SXkRKEnWiOxMmbvcSoAIzv/cGiuvRy57k4suKQSAdwA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@esbuild/aix-ppc64": {
       "version": "0.21.5",
       "resolved": "https://registry.npmjs.org/@esbuild/aix-ppc64/-/aix-ppc64-0.21.5.tgz",
@@ -997,6 +1007,123 @@
         "url": "https://github.com/sponsors/nzakas"
       }
     },
+    "node_modules/@istanbuljs/load-nyc-config": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/load-nyc-config/-/load-nyc-config-1.1.0.tgz",
+      "integrity": "sha512-VjeHSlIzpv/NyD3N0YuHfXOPDIixcA1q2ZV98wsMqcYlPmv2n3Yb2lYP9XMElnaFVXg5A7YLTeLu6V84uQDjmQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "camelcase": "^5.3.1",
+        "find-up": "^4.1.0",
+        "get-package-type": "^0.1.0",
+        "js-yaml": "^3.13.1",
+        "resolve-from": "^5.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/find-up": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+      "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/js-yaml": {
+      "version": "3.15.1",
+      "resolved": "https://registry.npmjs.org/js-yaml/-/js-yaml-3.15.1.tgz",
+      "integrity": "sha512-S99WuO3HlhO3XN41EtYUNl9zzXjoJx7QvmipxsJVxtCBT0YHEFy+iOJhjSvrmV12nYhWpZaM8lPHkJm0yUMbag==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "argparse": "^1.0.7",
+        "esprima": "^4.0.0"
+      },
+      "bin": {
+        "js-yaml": "bin/js-yaml.js"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/locate-path": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+      "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/p-locate": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+      "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/load-nyc-config/node_modules/resolve-from": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/resolve-from/-/resolve-from-5.0.0.tgz",
+      "integrity": "sha512-qYg9KP24dD5qka9J47d0aVky0N+b4fTU89LN9iDnjB5waksiC49rvMB0PrUJQGoTmH50XPiqOvAjDfaijGxYZw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/@istanbuljs/schema": {
+      "version": "0.1.6",
+      "resolved": "https://registry.npmjs.org/@istanbuljs/schema/-/schema-0.1.6.tgz",
+      "integrity": "sha512-+Sg6GCR/wy1oSmQDFq4LQDAhm3ETKnorxN+y5nbLULOR3P0c14f2Wurzj3/xqPXtasLFfHd5iRFQ7AJt4KH2cw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/@jridgewell/gen-mapping": {
       "version": "0.3.13",
       "resolved": "https://registry.npmjs.org/@jridgewell/gen-mapping/-/gen-mapping-0.3.13.tgz",
@@ -2117,6 +2244,20 @@
         "acorn": "^6.0.0 || ^7.0.0 || ^8.0.0"
       }
     },
+    "node_modules/aggregate-error": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
+      "integrity": "sha512-4I7Td01quW/RpocfNayFdFVk1qSuoh0E7JrbRJ16nH01HhKFQ88INq9Sd+nd72zqRySlr9BmDA8xlEJ6vJMrYA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "clean-stack": "^2.0.0",
+        "indent-string": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/ajv": {
       "version": "6.15.0",
       "resolved": "https://registry.npmjs.org/ajv/-/ajv-6.15.0.tgz",
@@ -2134,6 +2275,16 @@
         "url": "https://github.com/sponsors/epoberezkin"
       }
     },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/ansi-styles": {
       "version": "4.3.0",
       "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-4.3.0.tgz",
@@ -2214,6 +2365,26 @@
         "react-dom": ">=16.9.0"
       }
     },
+    "node_modules/append-transform": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/append-transform/-/append-transform-2.0.0.tgz",
+      "integrity": "sha512-7yeyCEurROLQJFv5Xj4lEGTy0borxepjFv1g22oAdqFu//SrAlDl1O1Nxx15SH1RoliUml6p8dwJW9jvZughhg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "default-require-extensions": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/archy": {
+      "version": "1.0.0",
+      "resolved": "https://registry.npmjs.org/archy/-/archy-1.0.0.tgz",
+      "integrity": "sha512-Xg+9RwCg/0p32teKdGMPTPnVXKD0w3DfHnFTficozsAgsvq2XenPJq/MYpzzQ/v8zrOyJn6Ds39VA4JIDwFfqw==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/argparse": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/argparse/-/argparse-2.0.1.tgz",
@@ -2493,6 +2664,22 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/caching-transform": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/caching-transform/-/caching-transform-4.0.0.tgz",
+      "integrity": "sha512-kpqOvwXnjjN44D89K5ccQC+RUrsy7jB/XLlRrx0D7/2HNcTPqzsb6XgYoErwko6QsV184CA2YgS1fxDiiDZMWA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "hasha": "^5.0.0",
+        "make-dir": "^3.0.0",
+        "package-hash": "^4.0.0",
+        "write-file-atomic": "^3.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/call-bind": {
       "version": "1.0.9",
       "resolved": "https://registry.npmjs.org/call-bind/-/call-bind-1.0.9.tgz",
@@ -2553,6 +2740,16 @@
         "node": ">=6"
       }
     },
+    "node_modules/camelcase": {
+      "version": "5.3.1",
+      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
+      "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/caniuse-lite": {
       "version": "1.0.30001809",
       "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001809.tgz",
@@ -2640,6 +2837,28 @@
       "resolved": "https://registry.npmjs.org/classnames/-/classnames-2.5.1.tgz",
       "integrity": "sha512-saHYOzhIQs6wy2sVxTM6bUDsQO4F50V9RQ22qBpEdCW+I+/Wmke2HOl6lS6dTpdxVhb88/I6+Hs+438c3lfUow=="
     },
+    "node_modules/clean-stack": {
+      "version": "2.2.0",
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+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
+    "node_modules/vite-plugin-istanbul/node_modules/source-map": {
+      "version": "0.7.6",
+      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.7.6.tgz",
+      "integrity": "sha512-i5uvt8C3ikiWeNZSVZNWcfZPItFQOsYTUAOkcUPGd8DqDy1uOUikjt5dG+uRlwyvR108Fb9DOd4GvXfT0N2/uQ==",
+      "dev": true,
+      "license": "BSD-3-Clause",
+      "engines": {
+        "node": ">= 12"
+      }
+    },
+    "node_modules/vite-plugin-istanbul/node_modules/test-exclude": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-6.0.0.tgz",
+      "integrity": "sha512-cAGWPIyOHU6zlmg88jwm7VRyXnMN7iV68OGAbYDk/Mh/xC/pzVPlQtY6ngoIH/5/tciuhGfvESU8GrHrcxD56w==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "@istanbuljs/schema": "^0.1.2",
+        "glob": "^7.1.4",
+        "minimatch": "^3.0.4"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/vite/node_modules/fsevents": {
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
@@ -8236,6 +9557,13 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/which-module": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/which-module/-/which-module-2.0.1.tgz",
+      "integrity": "sha512-iBdZ57RDvnOR9AGBhML2vFZf7h8vmBjhoaZqODJBFWHVtKkDmKuHai3cx5PgVMrX5YDNp27AofYbAwctSS+vhQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/which-typed-array": {
       "version": "1.1.22",
       "resolved": "https://registry.npmjs.org/which-typed-array/-/which-typed-array-1.1.22.tgz",
@@ -8268,6 +9596,41 @@
         "node": ">=0.10.0"
       }
     },
+    "node_modules/wrap-ansi": {
+      "version": "6.2.0",
+      "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-6.2.0.tgz",
+      "integrity": "sha512-r6lPcBGxZXlIcymEu7InxDMhdW0KDxpLgoFLcguasxCaJ/SOIZwINatK9KY/tf+ZrlywOKU0UDj3ATXUBfxJXA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "ansi-styles": "^4.0.0",
+        "string-width": "^4.1.0",
+        "strip-ansi": "^6.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/wrappy": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
+      "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
+      "dev": true,
+      "license": "ISC"
+    },
+    "node_modules/write-file-atomic": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/write-file-atomic/-/write-file-atomic-3.0.3.tgz",
+      "integrity": "sha512-AvHcyZ5JnSfq3ioSyjrBkH9yW4m7Ayk8/9My/DD9onKeu/94fwrMocemO2QAJFAlnnDN+ZDS+ZjAR5ua1/PV/Q==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "imurmurhash": "^0.1.4",
+        "is-typedarray": "^1.0.0",
+        "signal-exit": "^3.0.2",
+        "typedarray-to-buffer": "^3.1.5"
+      }
+    },
     "node_modules/xtend": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.2.tgz",
@@ -8278,6 +9641,13 @@
         "node": ">=0.4"
       }
     },
+    "node_modules/y18n": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
+      "integrity": "sha512-JKhqTOwSrqNA1NY5lSztJ1GrBiUodLMmIZuLiDaMRJ+itFd+ABVE8XBjOvIWL+rSqNDC74LCSFmlb/U4UZ4hJQ==",
+      "dev": true,
+      "license": "ISC"
+    },
     "node_modules/yallist": {
       "version": "3.1.1",
       "resolved": "https://registry.npmjs.org/yallist/-/yallist-3.1.1.tgz",
@@ -8300,6 +9670,99 @@
         "url": "https://github.com/sponsors/eemeli"
       }
     },
+    "node_modules/yargs": {
+      "version": "15.4.1",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-15.4.1.tgz",
+      "integrity": "sha512-aePbxDmcYW++PaqBsJ+HYUFwCdv4LVvdnhBy78E57PIor8/OVvhMrADFFEDh8DHDFRv/O9i3lPhsENjO7QX0+A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "cliui": "^6.0.0",
+        "decamelize": "^1.2.0",
+        "find-up": "^4.1.0",
+        "get-caller-file": "^2.0.1",
+        "require-directory": "^2.1.1",
+        "require-main-filename": "^2.0.0",
+        "set-blocking": "^2.0.0",
+        "string-width": "^4.2.0",
+        "which-module": "^2.0.0",
+        "y18n": "^4.0.0",
+        "yargs-parser": "^18.1.2"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs-parser": {
+      "version": "18.1.3",
+      "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-18.1.3.tgz",
+      "integrity": "sha512-o50j0JeToy/4K6OZcaQmW6lyXXKhq7csREXcDwk2omFPJEwUNOVtJKvmDr9EI1fAJZUyZcRF7kxGBWmRXudrCQ==",
+      "dev": true,
+      "license": "ISC",
+      "dependencies": {
+        "camelcase": "^5.0.0",
+        "decamelize": "^1.2.0"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/yargs/node_modules/find-up": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/find-up/-/find-up-4.1.0.tgz",
+      "integrity": "sha512-PpOwAdQ/YlXQ2vj8a3h8IipDuYRi3wceVQQGYWxNINccq40Anw7BlsEXCMbt1Zt+OLA6Fq9suIpIWD0OsnISlw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "locate-path": "^5.0.0",
+        "path-exists": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/locate-path": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/locate-path/-/locate-path-5.0.0.tgz",
+      "integrity": "sha512-t7hw9pI+WvuwNJXwk5zVHpyhIqzg2qTlklJOf0mVxGSbe3Fp2VieZcduNYjaLDoy6p9uGpQEGWG87WpMKlNq8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-locate": "^4.1.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/yargs/node_modules/p-limit": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/p-limit/-/p-limit-2.3.0.tgz",
+      "integrity": "sha512-//88mFWSJx8lxCzwdAABTJL2MyWB12+eIY7MDL2SqLmAkeKU9qxRvWuSyTjm3FUmpBEMuFfckAIqEaVGUDxb6w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-try": "^2.0.0"
+      },
+      "engines": {
+        "node": ">=6"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/yargs/node_modules/p-locate": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/p-locate/-/p-locate-4.1.0.tgz",
+      "integrity": "sha512-R79ZZ/0wAxKGu3oYMlz8jy/kbhsNrS7SKZ7PxEHBgJ5+F2mtFW2fK2cOtBh1cHYkQsbzFV7I+EoRKe6Yt0oK7A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "p-limit": "^2.2.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/yocto-queue": {
       "version": "0.1.0",
       "resolved": "https://registry.npmjs.org/yocto-queue/-/yocto-queue-0.1.0.tgz",
diff --git a/frontend/package.json b/frontend/package.json
index c10028b..2e17c89 100755
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -6,7 +6,9 @@
     "dev": "vite",
     "build": "tsc && vite build",
     "lint": "eslint src",
-    "test:e2e": "playwright test"
+    "test:e2e": "playwright test",
+    "test:e2e:cov": "cross-env COVERAGE=true playwright test",
+    "coverage:report": "node scripts/coverage-report.js"
   },
   "dependencies": {
     "@ant-design/icons": "^5.4.0",
@@ -25,14 +27,17 @@
     "@types/react": "^18.3.3",
     "@types/react-dom": "^18.3.0",
     "@vitejs/plugin-react": "^4.3.1",
+    "cross-env": "^10.1.0",
     "eslint": "^9.39.5",
     "eslint-plugin-jsx-a11y": "^6.10.2",
     "eslint-plugin-react-hooks": "^7.1.1",
     "eslint-plugin-sonarjs": "^4.2.0",
     "globals": "^17.11.0",
+    "nyc": "^18.0.0",
     "pg": "^8.23.0",
     "typescript": "^5.5.4",
     "typescript-eslint": "^8.67.0",
-    "vite": "^5.4.0"
+    "vite": "^5.4.0",
+    "vite-plugin-istanbul": "^6.0.2"
   }
 }
diff --git a/frontend/playwright.config.ts b/frontend/playwright.config.ts
index f37abfa..889af55 100755
--- a/frontend/playwright.config.ts
+++ b/frontend/playwright.config.ts
@@ -17,7 +17,14 @@ export default defineConfig({
   webServer: {
     command: 'npm run dev',
     url: 'http://localhost:5173',
-    reuseExistingServer: !process.env.CI,
+    // Forwarded so the dev server instruments its modules when the run is a
+    // coverage run. Without this the tests still pass and every page reports no
+    // coverage at all, which publishes a 0% that reads as "the tests stopped
+    // covering things" rather than "collection was never switched on".
+    env: { COVERAGE: process.env.COVERAGE ?? '' },
+    // Reusing a server that was started without COVERAGE would silently collect
+    // nothing, so a coverage run always starts its own.
+    reuseExistingServer: !process.env.CI && process.env.COVERAGE !== 'true',
     timeout: 30000
   },
   projects: [{ name: 'chromium', use: { ...devices['Desktop Chrome'] } }]
diff --git a/frontend/scripts/coverage-report.js b/frontend/scripts/coverage-report.js
new file mode 100644
index 0000000..78e12d3
--- /dev/null
+++ b/frontend/scripts/coverage-report.js
@@ -0,0 +1,63 @@
+#!/usr/bin/env node
+// Turns the per-test istanbul samples in .nyc_output into coverage/lcov.info for
+// SonarQube to import.
+//
+// The check below is the point of this script existing rather than the pipeline
+// just calling `nyc report`. The failure mode that matters here is not an error,
+// it is silence: if the dev server was started without COVERAGE, every test still
+// passes and every page reports no instrumentation, so .nyc_output stays empty
+// and nyc cheerfully writes a valid, empty report. SonarQube then shows frontend
+// coverage at 0%, which reads as "the tests stopped covering things" rather than
+// "collection was never switched on".
+//
+// This project has been bitten twice by tools succeeding while measuring nothing
+// — SonarQube skipping the entire frontend and still exiting EXECUTION SUCCESS
+// (#67), and an ESLint matcher silently matching no files (#60). Coverage has the
+// same shape, so it fails loudly instead.
+const { existsSync, readdirSync } = require('fs');
+const { execFileSync } = require('child_process');
+const path = require('path');
+
+const root = path.resolve(__dirname, '..');
+const nycOutput = path.join(root, '.nyc_output');
+
+const samples = existsSync(nycOutput)
+  ? readdirSync(nycOutput).filter((f) => f.endsWith('.json'))
+  : [];
+
+if (samples.length === 0) {
+  console.error('No coverage was collected — .nyc_output holds no samples.');
+  console.error('');
+  console.error('The tests may well have passed; that is the problem. Coverage is only');
+  console.error('gathered when the dev server is instrumented, which happens when COVERAGE=true');
+  console.error('reaches it. Run the suite with `npm run test:e2e:cov` rather than `npm run test:e2e`.');
+  console.error('');
+  console.error('If it was run that way, check that Playwright started its own dev server rather');
+  console.error('than reusing one you already had open — an uninstrumented server collects nothing.');
+  process.exit(1);
+}
+
+console.log(`Merging ${samples.length} coverage sample(s) from ${samples.length} test(s).`);
+
+// Invoked through nyc's own entry point rather than npx: on Windows, spawning
+// the npx.cmd shim fails with EINVAL under current Node unless a shell is used,
+// and running the JS directly avoids needing one at all.
+execFileSync(
+  process.execPath,
+  [
+    path.join(root, 'node_modules', 'nyc', 'bin', 'nyc.js'),
+    'report',
+    '--reporter=lcov',
+    '--reporter=text-summary',
+    '--report-dir',
+    'coverage'
+  ],
+  { cwd: root, stdio: 'inherit' }
+);
+
+const lcov = path.join(root, 'coverage', 'lcov.info');
+if (!existsSync(lcov)) {
+  console.error(`nyc reported success but ${lcov} was not written.`);
+  process.exit(1);
+}
+console.log(`Wrote ${path.relative(root, lcov)}`);
diff --git a/frontend/tests/e2e/account-modal.spec.ts b/frontend/tests/e2e/account-modal.spec.ts
index 744769d..fbf35de 100644
--- a/frontend/tests/e2e/account-modal.spec.ts
+++ b/frontend/tests/e2e/account-modal.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const PASSWORD = 'supersecret123';
 
diff --git a/frontend/tests/e2e/admin-disable-customer.spec.ts b/frontend/tests/e2e/admin-disable-customer.spec.ts
index f1312d2..87d3fc5 100644
--- a/frontend/tests/e2e/admin-disable-customer.spec.ts
+++ b/frontend/tests/e2e/admin-disable-customer.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const PASSWORD = 'supersecret123';
 const uniqueEmail = () => `disable-${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}@example.com`;
diff --git a/frontend/tests/e2e/admin-inline-category.spec.ts b/frontend/tests/e2e/admin-inline-category.spec.ts
index f639fe3..e48f2af 100644
--- a/frontend/tests/e2e/admin-inline-category.spec.ts
+++ b/frontend/tests/e2e/admin-inline-category.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 const suffix = () => `i${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
 
diff --git a/frontend/tests/e2e/admin-inventory-filters.spec.ts b/frontend/tests/e2e/admin-inventory-filters.spec.ts
index 01d2400..34e9318 100644
--- a/frontend/tests/e2e/admin-inventory-filters.spec.ts
+++ b/frontend/tests/e2e/admin-inventory-filters.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const RUN = `v${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
 
diff --git a/frontend/tests/e2e/admin-reserved-items.spec.ts b/frontend/tests/e2e/admin-reserved-items.spec.ts
index 4b9b3e3..c03ef3f 100644
--- a/frontend/tests/e2e/admin-reserved-items.spec.ts
+++ b/frontend/tests/e2e/admin-reserved-items.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 const suffix = () => `r${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
 
diff --git a/frontend/tests/e2e/admin-save-failures.spec.ts b/frontend/tests/e2e/admin-save-failures.spec.ts
index 0476d6d..58fb8c4 100644
--- a/frontend/tests/e2e/admin-save-failures.spec.ts
+++ b/frontend/tests/e2e/admin-save-failures.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 const suffix = () => `s${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
 
diff --git a/frontend/tests/e2e/admin-taxonomy.spec.ts b/frontend/tests/e2e/admin-taxonomy.spec.ts
index f99c4f2..f3d217b 100644
--- a/frontend/tests/e2e/admin-taxonomy.spec.ts
+++ b/frontend/tests/e2e/admin-taxonomy.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 // The e2e database is shared and never reset, so every fixture name carries a
 // unique suffix and assertions are scoped to the nodes this run created. The
diff --git a/frontend/tests/e2e/admin-theme.spec.ts b/frontend/tests/e2e/admin-theme.spec.ts
index e369079..523ebc6 100644
--- a/frontend/tests/e2e/admin-theme.spec.ts
+++ b/frontend/tests/e2e/admin-theme.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 // Relative luminance per WCAG, used to tell "light" from "dark" without
 // asserting exact hex values, which would break on any palette tweak.
diff --git a/frontend/tests/e2e/auth.spec.ts b/frontend/tests/e2e/auth.spec.ts
index 5ba3608..5f887ff 100755
--- a/frontend/tests/e2e/auth.spec.ts
+++ b/frontend/tests/e2e/auth.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const PASSWORD = 'supersecret123';
 
diff --git a/frontend/tests/e2e/favorites-filter.spec.ts b/frontend/tests/e2e/favorites-filter.spec.ts
index 0ac2baa..f87a023 100644
--- a/frontend/tests/e2e/favorites-filter.spec.ts
+++ b/frontend/tests/e2e/favorites-filter.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const PASSWORD = 'supersecret123';
 // The storefront runs against a shared database that is never reset, so every
diff --git a/frontend/tests/e2e/favorites.spec.ts b/frontend/tests/e2e/favorites.spec.ts
index 751df93..5018c31 100644
--- a/frontend/tests/e2e/favorites.spec.ts
+++ b/frontend/tests/e2e/favorites.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 
 const PASSWORD = 'supersecret123';
 const RUN = `f${Date.now().toString(36)}${Math.random().toString(36).slice(2, 7)}`;
diff --git a/frontend/tests/e2e/filters.spec.ts b/frontend/tests/e2e/filters.spec.ts
index e53dba7..6c47726 100644
--- a/frontend/tests/e2e/filters.spec.ts
+++ b/frontend/tests/e2e/filters.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, APIRequestContext } from '@playwright/test';
+import { test, expect, APIRequestContext } from './fixtures';
 
 // The storefront shows every item ever seeded, and the e2e database is not
 // reset between runs. Every fixture below is therefore suffixed with a unique
diff --git a/frontend/tests/e2e/fixtures.ts b/frontend/tests/e2e/fixtures.ts
new file mode 100644
index 0000000..3cab96d
--- /dev/null
+++ b/frontend/tests/e2e/fixtures.ts
@@ -0,0 +1,47 @@
+import { test as base } from '@playwright/test';
+import { mkdirSync, writeFileSync } from 'fs';
+import { randomUUID } from 'crypto';
+import path from 'path';
+
+// Re-exported so specs can import everything from here — expect, Page,
+// APIRequestContext — and get the coverage-collecting `test` at the same time.
+// The explicit `test` below wins over the star export.
+export * from '@playwright/test';
+
+const NYC_OUTPUT = path.resolve(__dirname, '..', '..', '.nyc_output');
+const collectingCoverage = process.env.COVERAGE === 'true';
+
+// Set once any page reports instrumentation. Checked by the collection script so
+// an empty run fails loudly instead of publishing 0% — see the note below.
+const MARKER = path.join(NYC_OUTPUT, '.collected');
+
+/**
+ * Flushes istanbul's per-page counters after each test.
+ *
+ * Coverage lives in `window.__coverage__` on the page and dies with it, so it
+ * has to be read before the page closes — one file per test, because the suite
+ * runs fullyParallel and workers would otherwise overwrite each other.
+ */
+export const test = base.extend<{ collectCoverage: void }>({
+  collectCoverage: [
+    async ({ page }, use) => {
+      await use();
+
+      if (!collectingCoverage) return;
+
+      // The page may already be closed by a test that navigated away or crashed;
+      // a missing sample is not worth failing a passing test over. The run-level
+      // check catches the case that actually matters — no samples at all.
+      const coverage = await page
+        .evaluate(() => (window as unknown as { __coverage__?: unknown }).__coverage__)
+        .catch(() => undefined);
+
+      if (!coverage) return;
+
+      mkdirSync(NYC_OUTPUT, { recursive: true });
+      writeFileSync(path.join(NYC_OUTPUT, `${randomUUID()}.json`), JSON.stringify(coverage));
+      writeFileSync(MARKER, 'ok');
+    },
+    { auto: true }
+  ]
+});
diff --git a/frontend/tests/e2e/password-reset.spec.ts b/frontend/tests/e2e/password-reset.spec.ts
index 189ba79..4230411 100644
--- a/frontend/tests/e2e/password-reset.spec.ts
+++ b/frontend/tests/e2e/password-reset.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect, Page } from '@playwright/test';
+import { test, expect, Page } from './fixtures';
 import { Client } from 'pg';
 
 const PASSWORD = 'supersecret123';
diff --git a/frontend/tests/e2e/storefront-errors.spec.ts b/frontend/tests/e2e/storefront-errors.spec.ts
index 1ba288e..5a6539c 100644
--- a/frontend/tests/e2e/storefront-errors.spec.ts
+++ b/frontend/tests/e2e/storefront-errors.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 test.describe('Storefront failure states', () => {
   test('reports a server failure instead of claiming the store is empty', async ({ page }) => {
diff --git a/frontend/tests/e2e/storefront.spec.ts b/frontend/tests/e2e/storefront.spec.ts
index d55433d..6f5d4b2 100755
--- a/frontend/tests/e2e/storefront.spec.ts
+++ b/frontend/tests/e2e/storefront.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 test.describe('Storefront', () => {
   test('loads and shows the site title', async ({ page }) => {
diff --git a/frontend/tests/e2e/theme.spec.ts b/frontend/tests/e2e/theme.spec.ts
index e354901..6c43a9c 100755
--- a/frontend/tests/e2e/theme.spec.ts
+++ b/frontend/tests/e2e/theme.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 test.describe('Theme switching', () => {
   test('toggling the switch changes the body theme attribute', async ({ page }) => {
diff --git a/frontend/tests/e2e/verify-email.spec.ts b/frontend/tests/e2e/verify-email.spec.ts
index b6762d5..d9d3881 100644
--- a/frontend/tests/e2e/verify-email.spec.ts
+++ b/frontend/tests/e2e/verify-email.spec.ts
@@ -1,4 +1,4 @@
-import { test, expect } from '@playwright/test';
+import { test, expect } from './fixtures';
 
 // The /verify-email route was missing entirely, so the link in every verification
 // email rendered a blank page. These cover the route existing and reporting an
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index afdf0d3..e12b42f 100755
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -1,8 +1,29 @@
-import { defineConfig } from 'vite';
+import { defineConfig, type PluginOption } from 'vite';
 import react from '@vitejs/plugin-react';
 
-export default defineConfig({
-  plugins: [react()],
+// Coverage instrumentation is opt-in and must stay that way. The plugin rewrites
+// every source file to record execution, which is what makes end-to-end coverage
+// possible and what must never reach a customer: an instrumented bundle is
+// substantially larger and slower, and it publishes the source structure through
+// window.__coverage__.
+//
+// Nothing in the production path sets COVERAGE — the Dockerfile runs a plain
+// `npm run build` — so the shipped bundle is uninstrumented. Only the Playwright
+// coverage run turns this on, via playwright.config.ts passing it to the dev
+// server it starts.
+//
+// Loaded with a dynamic import rather than at the top of the file because
+// vite-plugin-istanbul is ESM-only and this config is evaluated as CommonJS, the
+// package having no "type": "module". A static import fails the build outright.
+// The upside is that a production build never even resolves the package.
+async function coveragePlugins(): Promise<PluginOption[]> {
+  if (process.env.COVERAGE !== 'true') return [];
+  const { default: istanbul } = await import('vite-plugin-istanbul');
+  return [istanbul({ include: 'src/**/*', extension: ['.ts', '.tsx'], requireEnv: false })];
+}
+
+export default defineConfig(async () => ({
+  plugins: [react(), ...(await coveragePlugins())],
   build: { outDir: 'dist' },
   server: {
     proxy: {
@@ -11,4 +32,4 @@ export default defineConfig({
       '/webhooks': 'http://localhost:3000'
     }
   }
-});
+}));
diff --git a/sonar-project.properties b/sonar-project.properties
index b6f7c2d..6d3ffec 100644
--- a/sonar-project.properties
+++ b/sonar-project.properties
@@ -14,3 +14,18 @@ sonar.sourceEncoding=UTF-8
 # EXECUTION SUCCESS. See #67. tsconfig.sonar.json is an analysis-only mirror;
 # both it and this line go away once the server can parse "bundler".
 sonar.typescript.tsconfigPaths=backend/tsconfig.json,frontend/tsconfig.sonar.json
+
+# Test sources, so they are analysed under the test rule set rather than as
+# production code — or, as before, not at all.
+sonar.tests=backend/tests,frontend/tests
+
+# Coverage. Three reports because the suites cover genuinely different things and
+# jest would otherwise overwrite one with the other: the unit suite alone reports
+# ~11% because everything in src/routes is exercised by the integration suite,
+# not by it. SonarQube merges them, so a line covered by any suite counts.
+#
+# Read the frontend number with suspicion. It comes from Playwright through an
+# istanbul-instrumented dev server, and istanbul marks a line covered when the
+# browser ran it — a component renders during an end-to-end test and reports as
+# covered with nothing asserting anything about it. See #61's design doc.
+sonar.javascript.lcov.reportPaths=backend/coverage/unit/lcov.info,backend/coverage/integration/lcov.info,frontend/coverage/lcov.info