fix: keep macOS cursor visible after keyboard input

[onlyless]

Description

This change improves macOS remote desktop cursor behavior after keyboard input.

On macOS, the system may hide the cursor while typing. In Moonlight/Sunshine remote desktop sessions, the cursor can remain hidden until a large mouse movement is sent. The macOS input backend now nudges the cursor visible after keyboard input by:

• associating mouse movement with cursor position
• showing the cursor for the current display
• posting a zero-delta mouse moved event at the current cursor position

The existing streaming loop also now has a macOS implementation for enable_mouse_keys() that keeps cursor association/display visibility refreshed while streaming.

Screenshot

N/A

Issues Fixed or Closed

N/A

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Other

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code where needed
• I have tested my changes
• I have updated documentation where needed
• I have added tests that prove my fix is effective or that my feature works

Test Plan

• env npm_config_cache=/private/tmp/sunshine-npm-cache cmake --build cmake-build-macos-check --target test_sunshine sunshine
• env HOME=/private/tmp/sunshine-test-home XDG_CONFIG_HOME=/private/tmp/sunshine-test-home/.config cmake-build-macos-check/tests/test_sunshine --gtest_color=yes '--gtest_filter=-AVAudioTest.*:AVAudioTest/*:Configurations/AudioTest.*:MouseInputs/MouseHIDTest.*:EncoderVariants/EncoderTest.*'
• Manual validation on Apple Silicon Mac mini with Moonlight client: cursor returns after keyboard input and streaming remains functional

[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