fix(desktop): avoid false profile switch resets

[tingaidehua]

Summary

• make desktop profile-switch callbacks fire only when the profile value actually changes
• prevent React StrictMode effect replay from clearing settings state on mount
• add a regression test for StrictMode replay and real profile changes

Tests

• npm --workspace apps/desktop run test:ui -- src/app/hooks/use-on-profile-switch.test.tsx
• npm --workspace apps/desktop exec eslint -- --quiet src/app/hooks/use-on-profile-switch.ts src/app/hooks/use-on-profile-switch.test.tsx
• npm --workspace apps/desktop run typecheck
• npm --workspace apps/desktop run build

[tingaidehua]

fix by codex，when develop by dev mode