fix: Invalid configuration instead of related notes (#20251)

## Summary
The Notes widget (and other record-bound widgets like Tasks, Files,
Calendar, Emails) incorrectly displayed "Invalid Configuration" when
rendered on dashboard or standalone page contexts. The root cause was an
overly broad `ErrorBoundary` that caught all runtime errors uniformly
and displayed a misleading error message.
## Related issue
Fixes: #20118 
## Problem Analysis
**Proximate Cause:**
- `NotesCard` calls `useTargetRecord()` which throws a generic `Error`
when `targetRecordIdentifier` is undefined
- `ErrorBoundary` in `WidgetCardShell.tsx` catches this error and
renders `PageLayoutWidgetInvalidConfigDisplay`
- This displays "Invalid Configuration" which is factually misleading

**Triggering Cause:**
- Commit 5cd8b7899d removed the feature flag gate on page layouts,
making them standard for all workspaces
- This exposed record-bound widgets to dashboard contexts where
`targetRecordIdentifier` is intentionally undefined

**Error Propagation Chain:**
```
WidgetContentRenderer → NoteWidget → NotesCard → useTargetRecord()
useTargetRecord() throws Error('useTargetRecord must be used within a record page context')
ErrorBoundary catches error → PageLayoutWidgetInvalidConfigDisplay renders misleading UI
```
## Solution
Introduced a distinction between **configuration errors** and **record
context requirement errors** by:
1. Creating a custom error class `RecordContextRequiredError`
2. Updating `useTargetRecord()` to throw this specific error type
3. Creating a dedicated display component for record context errors
4. Updating the `ErrorBoundary` fallback to handle error types
appropriately
## User Impact
| Before | After |
|--------|-------|
| "Invalid Configuration" (red badge) | "Record Required" (gray badge) |
| Misleading error message | Accurate context-aware message |
| Users think widget is broken | Users understand widget needs record
context |

---------

Co-authored-by: Charles Bochet <charles@twenty.com>
Co-authored-by: Cursor <cursoragent@cursor.com>

packages/twenty-front/src/modules/activities/hooks/useActivities.ts

@@ -33,6 +33,11 @@ export const useActivities = <T extends Task | Note>({
     (activityTargets: (TaskTarget | NoteTarget)[]) => {
       for (const activityTarget of activityTargets) {
         const activity = activityTarget[objectNameSingular];
+
+        if (!isDefined(activity)) {
+          continue;
+        }
+
         store.set(recordStoreFamilyState.atomFamily(activity.id), activity);
       }
     },