fix: app unresponsive

[CurryYangxx]

Fix #7445

Based on the user's feedback, the app's unresponsiveness is caused by this interval logic.

Changes:

• listen focus and blur event, stop interval when the app is not focus
• trigger sync when user come back to app

[sentry]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Error: Expected fetch controller: :r30: app:///index.html View Issue
• ‼️ ApplicationNotResponding: Application Not Responding for at least 5000 ms triggerSync(src/ui/components/dropdowns/sync-dr... View Issue
• ‼️ ApplicationNotResponding: Application Not Responding for at least 5000 ms <anonymous>(src/main/window-utils) View Issue
• ‼️ ApplicationNotResponding: Application Not Responding for at least 5000 ms <anonymous>(src/main/window-utils) View Issue
• ‼️ ApplicationNotResponding: Application Not Responding for at least 5000 ms S3(src/common/constants) View Issue

_{Did you find this useful? React with a 👍 or 👎}