add scoped coverage reporting

package.json

@@ -33,6 +33,12 @@
         "test:backend": "nx test electron-backend",
         "test:unit:all": "nx run-many --target=test --all --parallel=3",
         "test:unit:ci": "nx run-many --target=test --projects=electron-backend,web,services,m3u-state,portal-stalker-data-access,portal-shared-util,playlist-shared-ui,portal-xtream-data-access,portal-xtream-feature,workspace-dashboard-data-access,components,@iptvnator/pipes,packaging,epg-data-access,workspace-shell-util,database --parallel=3 --output-style=static",
+        "coverage:unit:ci": "node tools/coverage/run-tier-a-coverage.mjs",
+        "coverage:merge": "node tools/coverage/merge-coverage.mjs",
+        "coverage:health": "node tools/coverage/coverage-health.mjs",
+        "coverage:ci": "pnpm run coverage:unit:ci && pnpm run coverage:merge && node tools/coverage/coverage-health.mjs --require-report",
+        "coverage:e2e:summary": "node tools/coverage/e2e-semantic-summary.mjs",
+        "coverage:e2e:v8:web": "node tools/coverage/e2e-v8-web.mjs",
         "typecheck:web": "tsc -p apps/web/tsconfig.app.json --noEmit",
         "typecheck:backend": "tsc -p apps/electron-backend/tsconfig.app.json --noEmit",
         "typecheck:ci": "pnpm run typecheck:web && pnpm run typecheck:backend",
@@ -184,6 +190,9 @@
         "eslint-plugin-playwright": "^1.6.2",
         "express": "5.2.1",
         "globals": "15.9.0",
+        "istanbul-lib-coverage": "3.2.2",
+        "istanbul-lib-report": "3.0.1",
+        "istanbul-reports": "3.2.0",
         "jest": "^30.0.2",
         "jest-environment-jsdom": "^30.0.2",
         "jest-environment-node": "^30.0.2",