fix(screen-time): pause tracking while suspended

[AdityaKr015]

Summary

This PR fix the screen time tracking across system suspend. Builds on the commit lock-pause fix (3f66cfafb) and adds the suspend coverage that was missing from it.

Motivation

Just adds the fix for the missing suspend part which didn't merged from this PR #3897.

Type of Change

• Bug fix
• New feature
• Breaking change
• Refactoring
• Build / packaging

Related Issue

Related to #3882 (already closed by the commit 3f66cfafb), this PR adds the suspend half of that fix.

Testing

• Ran just format, just build, just test all clean and test passed.

Manual Coverage

• Tested on Niri
• Tested on Hyprland
• Tested on Sway
• Tested on another compositor:
• Tested with different bar positions and density settings
• Tested at different interface scaling values
• Tested with multiple monitors

Checklist

• This PR is ready for review.
• I read and followed the relevant guidance in CONTRIBUTING.md.
• I ran just format with clang-format v22+ installed.
• I ran the relevant build or test commands.
• I self-reviewed the changes.
• I checked for new warnings or errors.
• I will update end-user documentation after merge, or this PR does not change user-facing configuration or behavior.
• I added or updated assets/translations/en.json, or this PR adds no new user-facing strings.
• I did not edit non-English translation files unless this PR is explicitly for translation tooling, an import/export sync, or a maintainer-requested locale change.
• I used the existing canonical names for config keys, IPC names, paths, and identifiers.

[ItsLemmy]

Thanks!

[AdityaKr015]

Thanks for the merge