feat(linux): Support streaming through XDG portals and Pipewire

[ReenigneArcher]

Description

This PR replaces #2507 ... Thanks to @garnacho for the initial work on this!

This PR adds a new "grab" implementation to use XDG desktop portals and Pipewire.

TODO:

• update homebrew formula, depends on pipewire 1.4.9 (new formula) Homebrew/homebrew-core#254211
• fix software encoder tests (XDG portal should not be primary capture method)
  • AppImage
  • FreeBSD
• reduce/eliminate sonar warnings

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

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

❌ Patch coverage is 9.42928% with 365 lines in your changes missing coverage. Please review.
✅ Project coverage is 11.33%. Comparing base (a2e6fc9) to head (d65baf5).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/platform/linux/portalgrab.cpp	8.65%	347 Missing and 12 partials ⚠️
src/platform/linux/misc.cpp	40.00%	2 Missing and 4 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4417      +/-   ##
==========================================
- Coverage   14.23%   11.33%   -2.91%     
==========================================
  Files          89       88       -1     
  Lines       18936    17998     -938     
  Branches     8677     8264     -413     
==========================================
- Hits         2696     2040     -656     
- Misses      12963    15248    +2285     
+ Partials     3277      710    -2567     

Flag	Coverage Δ
FreeBSD-14.3-aarch64	?
FreeBSD-14.3-amd64	?
Linux-AppImage	8.58% <9.42%> (-2.98%)	⬇️
Windows-AMD64	13.34% <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/misc.cpp	10.42% <40.00%> (-4.03%)	⬇️
src/platform/linux/portalgrab.cpp	8.65% <8.65%> (ø)

... and 57 files with indirect coverage changes

[sonarqubecloud]

Quality Gate failed

Failed conditions
111 New issues
111 New Code Smells (required ≤ 0)

See analysis details on SonarQube Cloud

Catch issues before they fail your Quality Gate with our IDE extension SonarQube for IDE