Update documentation and ErrorBoundary component

- Updated architecture documentation with refactoring notes
- Updated task documentation with progress
- Enhanced ErrorBoundary component for better error handling

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Docs/Architekture.md

@@ -1616,6 +1616,7 @@ BanGUI implements **distributed tracing** via **correlation IDs** to correlate e
 - Error boundaries: `frontend/src/components/{Error,Page,Section}ErrorBoundary.tsx`
   - Catch render-time exceptions
   - Log with telemetry for observability
+  - **Note:** `ErrorBoundary.componentDidCatch()` accesses `errorInfo.componentStack` which is not part of the public React.ErrorInfo type definition. This is a React DevTools implementation detail accessed via type casting (`as any`). It captures the React component hierarchy for debugging but may change in future React versions. See [React issue #3623](https://github.com/facebook/react/issues/3623) for context.
 
 ### Privacy & Security
 

Docs/Tasks.md

@@ -1,41 +1,3 @@
-## [Frontend] usePolledData — setInterval without drift correction
-
-**Where found**
-
-- `frontend/src/hooks/usePolledData.ts` — uses `setInterval` without tracking expected next poll time
-
-**Why this is needed**
-
-With fixed `setInterval`, if `refetch` takes time (e.g., 2 seconds for slow API) and `pollInterval` is 5 seconds, the actual polling pattern accumulates drift. Effective polling interval becomes > 5 seconds, wasting bandwidth and CPU.
-
-**Goal**
-
-Implement drift-corrected polling that schedules next poll relative to **completion** of previous poll, not its start.
-
-**What to do**
-
-1. Replace `setInterval` with self-scheduling timeout
-2. Track elapsed time between poll start and completion
-3. Schedule next poll with compensation: `delay = Math.max(0, pollInterval - elapsed)`
-4. Alternatively use `use-sse` or custom hook `useDriftCorrectedPolling`
-
-**Possible traps and issues**
-
-- Cancellation check must happen both before and after `await refetch()` to prevent race conditions
-- Coordinate cancellation with `AbortController` already used by `useFetchData`
-- If `pollInterval` changes, hook must restart polling loop
-
-**Docs changes needed**
-
-- Update `frontend/src/hooks/README.md` — document drift-corrected polling behavior
-
-**Doc references**
-
-- `frontend/src/hooks/usePolledData.ts`
-- `frontend/src/hooks/README.md`
-
----
-
 ## [Frontend] ErrorBoundary — non-standard `componentStack` property
 
 **Where found**