fix: Address PR #695 review feedback for TooltipProvider refactor

- Add delayDuration={300} to global TooltipProvider in app.tsx to
  maintain consistent tooltip timing (previously many components used
  delayDuration={200}, so 300ms is a good compromise per review)
- Remove leftover TooltipProvider wrappers in task-node.tsx that were
  still referenced after import was removed (causing build failure)
- Remove leftover TooltipProvider wrapper in account-section.tsx
- Fix Tooltip+Popover nesting focus management issue in
  graph-filter-controls.tsx by adding onOpenAutoFocus={(e) =>
  e.preventDefault()} to PopoverContent components

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/ui/src/app.tsx

@@ -76,7 +76,7 @@ export default function App() {
   }, []);
 
   return (
-    <TooltipProvider>
+    <TooltipProvider delayDuration={300}>
       <RouterProvider router={router} />
       {showSplash && !disableSplashScreen && <SplashScreen onComplete={handleSplashComplete} />}
     </TooltipProvider>