fix: remove 10 unused variables in File Manager and config files

Cleaned up more unused imports, parameters, and variables:
- FileManagerGrid.tsx: removed 4 unused variables (params, function)
- FileManagerContextMenu.tsx: removed Share import
- FileManagerSidebar.tsx: removed onLoadDirectory parameter
- DraggableWindow.tsx: removed Square import
- FileWindow.tsx: removed updateWindow variable
- ServerConfig.tsx: removed 2 unused error parameters

Reduced lint errors from 236 to 222 (14 errors fixed total)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/Apps/Credentials/CredentialSelector.tsx

@@ -35,7 +35,7 @@ export function CredentialSelector({
           ? data
           : data.credentials || data.data || [];
         setCredentials(credentialsArray);
-      } catch (error) {
+      } catch {
         const { toast } = await import("sonner");
         toast.error(t("credentials.failedToFetchCredentials"));
         setCredentials([]);