Add React Query staleTime Configuration

[foxintheloop]

Problem

React Query hooks have no staleTime set. The default is 0, meaning every component mount triggers a refetch — even if data was fetched milliseconds ago. This causes unnecessary IPC round-trips, especially during navigation between views.

Solution

Add appropriate staleTime values:

• Tasks and lists: staleTime: 30_000 (30 seconds)
• Settings and feature flags: staleTime: 300_000 (5 minutes)
• Analytics/dashboard: staleTime: 60_000 (1 minute)

Consider setting a global default in the QueryClient config:

const queryClient = new QueryClient({
  defaultOptions: {
    queries: { staleTime: 30_000 },
  },
});

Files

• apps/electron/src/renderer/App.tsx — set global staleTime
• Individual query hooks as needed for custom values