fix(linux/xdgportal): populate host latency statistics

[psyke83]

Description

Populate host latency statistics via export of frame_timestamp to encoded images.

Screenshot

Issues Fixed or Closed

Roadmap Issues

Type of Change

• feat: New feature (non-breaking change which adds functionality)
• fix: Bug fix (non-breaking change which fixes an issue)
• docs: Documentation only changes
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semicolons, etc.)
• refactor: Code change that neither fixes a bug nor adds a feature
• perf: Code change that improves performance
• test: Adding missing tests or correcting existing tests
• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Other changes that don't modify src or test files
• revert: Reverts a previous commit
• BREAKING CHANGE: Introduces a breaking change (can be combined with any type above)

Checklist

• Code follows the style guidelines of this project
• Code has been self-reviewed
• Code has been commented, particularly in hard-to-understand areas
• Code docstring/documentation-blocks for new or existing methods/components have been added or updated
• Unit tests have been added or updated for any new or modified functionality

AI Usage

• None: No AI tools were used in creating this PR
• Light: AI provided minor assistance (formatting, simple suggestions)
• Moderate: AI helped with code generation or debugging specific parts
• Heavy: AI generated most or all of the code changes

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.10%. Comparing base (8655742) to head (b49b4e6).
⚠️ Report is 4 commits behind head on master.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/platform/linux/portalgrab.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4685      +/-   ##
==========================================
- Coverage   15.17%   15.10%   -0.07%     
==========================================
  Files          95       95              
  Lines       19874    19875       +1     
  Branches     9178     9179       +1     
==========================================
- Hits         3016     3003      -13     
- Misses      15343    15564     +221     
+ Partials     1515     1308     -207     

Flag	Coverage Δ
Archlinux	11.20% <0.00%> (-0.01%)	⬇️
FreeBSD-14.3-aarch64	?
FreeBSD-14.3-amd64	13.23% <0.00%> (-0.01%)	⬇️
Homebrew-ubuntu-22.04	13.43% <0.00%> (-0.01%)	⬇️
Linux-AppImage	11.60% <0.00%> (-0.01%)	⬇️
Windows-AMD64	13.49% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/platform/linux/portalgrab.cpp	4.49% <0.00%> (-0.01%)	⬇️

... and 27 files with indirect coverage changes