Fix issue #1815: Add delay before running catch-up backups after resume

[Sayeem3051]

When the system resumes from sleep/suspend, the scheduler immediately triggers catch-up backups if any scheduled runs were missed during the sleep period. This can cause errors if system services (NetworkManager, DBus) are not yet fully initialized.

This fix adds a 30-second delay using QtCore.QTimer.singleShot() before executing the catch-up backup, giving the system time to fully restore network state and services.

Fixes #1815

Description

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have read the CONTRIBUTING guide.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

I provide my contribution under the terms of the license of this repository and I affirm the Developer Certificate of Origin.

[Sayeem3051]

@chatgpt-codex-connector Thank you for catching that critical indentation error! 🎯

I've fixed the issue with commit 770f56a:

• The QtCore.QTimer.singleShot(...) line is now properly indented inside the try block
• Both commits are now verified (no syntax errors)
• The code can parse correctly and the module will load successfully

The fix maintains the intended behavior:
✅ Catches up missed backups after resume
✅ Adds 30-second delay for system services to initialize
✅ Properly contained in try-finally block

Ready for review!