Refactor code structure for improved readability and maintainability

src/Web/StellaOps.Web/TASKS.md

@@ -19,7 +19,7 @@
 | UI-POLICY-23-001 | DONE (2025-12-05) | Workspace route `/policy-studio/packs` with pack list + quick actions; cached pack store with offline fallback. |
 | UI-POLICY-23-002 | DONE (2025-12-05) | YAML editor route `/policy-studio/packs/:packId/yaml` with canonical preview and lint diagnostics. |
 | UI-POLICY-23-003 | DONE (2025-12-05) | Rule Builder route `/policy-studio/packs/:packId/rules` with guided inputs and deterministic preview JSON. |
-| UI-POLICY-23-004 | DONE (2025-12-05) | Approval workflow UI updated with readiness checklist, schedule window card, comment thread, and two-person indicator; targeted Karma spec build succeeds, execution blocked by missing system lib (`libnss3.so`) for ChromeHeadless. |
+| UI-POLICY-23-004 | DONE (2025-12-05) | Approval workflow UI with checklist/schedule/comments; targeted Karma spec now passes locally using Playwright Chromium + bundled NSS libs (`CHROME_BIN=$HOME/.cache/ms-playwright/chromium-1140/chrome-linux/chrome`, `LD_LIBRARY_PATH=$PWD/.deps/usr/lib/x86_64-linux-gnu`). |
 | UI-POLICY-23-005 | DONE (2025-12-05) | Simulator updated with SBOM/advisory pickers and explain trace view; uses PolicyApiService simulate. |
-| UI-POLICY-23-006 | DOING (2025-12-05) | Explain view route `/policy-studio/packs/:packId/explain/:runId` with trace + JSON export; PDF export pending backend. |
+| UI-POLICY-23-006 | DONE (2025-12-06) | Explain view route `/policy-studio/packs/:packId/explain/:runId` with trace + JSON/PDF export (uses offline-safe jsPDF shim). |
 | UI-POLICY-23-001 | DONE (2025-12-05) | Workspace route `/policy-studio/packs` with pack list + quick actions; cached pack store with offline fallback. |