Add object type filter dropdown to side panel record searches (#18912)

## Summary

- Adds an object type filter dropdown to the side panel, allowing users
to scope record search results to a specific object type (e.g. People,
Companies, Opportunities)
- The filter appears as a funnel icon next to the search input in both
the global search (SearchRecords page) and the "Pick a record" sidebar
flow
- Replaces the AI sparkles button on the search records page with the
filter icon
- Uses colored icons matching the navigation menu style
(NavigationMenuItemStyleIcon + getStandardObjectIconColor)

## Test plan

- [ ] Open the side panel, type something to enter SearchRecords mode,
verify the filter icon appears
- [ ] Click the filter icon, verify the dropdown opens with "Object"
header, search input, "All Objects" and individual object types with
colored icons
- [ ] Select an object type, verify only records of that type appear in
search results
- [ ] Select "All Objects", verify all record types appear again
- [ ] Verify the filter icon turns blue when a filter is active
- [ ] In layout customization mode, add a new sidebar item > Record,
verify the filter dropdown also works there
- [ ] Close and reopen the side panel, verify the filter resets to "All
Objects"
- [ ] Verify the AI sparkles button no longer appears on the command
menu root page
- [ ] Verify the AI edit icon still appears on Ask AI pages


Made with [Cursor](https://cursor.com)

packages/twenty-client-sdk/src/metadata/generated/schema.graphql

@@ -4089,6 +4089,7 @@ input UpdateObjectPayload {
   labelIdentifierFieldMetadataId: UUID
   imageIdentifierFieldMetadataId: UUID
   isLabelSyncedWithName: Boolean
+  isSearchable: Boolean
 }
 
 input UpdateViewFieldInput {