fix(linux): split relative and absolute mouse devices

[ReenigneArcher]

Description

Splits relative and absolute mouse devices.

Screenshot

Issues Fixed or Closed

• Fixes Linux/X11: absolute mouse moves from Moonlight iOS "Touchscreen" mode are dropped (libvirtualhid single mouse device); clicks work Sunshine#5642

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

See our AI usage policy.

• 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]

Codecov Report

❌ Patch coverage is 80.18868% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 73.45%. Comparing base (6fdb8bd) to head (5a288c4).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/platform/linux/uhid_backend.cpp	80.18%	8 Missing and 13 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   73.34%   73.45%   +0.11%     
==========================================
  Files          34       34              
  Lines        9235     9305      +70     
  Branches     3439     3471      +32     
==========================================
+ Hits         6773     6835      +62     
+ Misses       2138     1829     -309     
- Partials      324      641     +317     

Flag	Coverage Δ
FreeBSD	52.03% <26.41%> (-0.54%)	⬇️
Linux-Clang	55.11% <63.20%> (+0.14%)	⬆️
Linux-GCC	65.93% <79.41%> (+0.15%)	⬆️
Windows-MSVC	88.32% <ø> (+0.10%)	⬆️
Windows-MinGW-UCRT64	62.96% <ø> (+0.01%)	⬆️
macOS	48.66% <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/uhid_backend.cpp	81.48% <80.18%> (-0.01%)	⬇️

... and 11 files with indirect coverage changes

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