feat(assistant-ui): add "Manage Connectors" option to ComposerAction and clean up DocumentsFilters component

- Introduced a new dropdown menu item for managing connectors in the ComposerAction component.
- Removed unused upload button and related props from the DocumentsFilters component for improved clarity and simplicity.
- Updated LayoutDataProvider and RightPanel components to streamline state management and enhance layout consistency.

surfsense_web/components/assistant-ui/thread.tsx

@@ -1359,6 +1359,10 @@ const ComposerAction: FC<ComposerActionProps> = ({
 								<Camera className="h-4 w-4" />
 								Take a screenshot
 							</DropdownMenuItem>
+							<DropdownMenuItem onSelect={() => setConnectorDialogOpen(true)}>
+								<Unplug className="h-4 w-4" />
+								Manage Connectors
+							</DropdownMenuItem>
 							<DropdownMenuSub
 								open={toolsPopoverOpen}
 								onOpenChange={(open) => {