feat: Simplify QT-based tray implementaion

[Kishi85]

Description

This reworks the Qt-based tray with an adapted version of QtTrayMenu.h/cpp from upstream as suggested in LizardByte/Sunshine#4907.

This currently a very early work-in-progress version of the code with all of Lizardbyte's forks additional functionality (e.g. notifications) implemented but tested only very limited.

There is also still an issue with left clicking the tray icon that is also present in the current AI based implementation which caused by https://qt-project.atlassian.net/browse/QTBUG-139921.

This version is platform-neutral for QtTrayMenu.h/cpp code with Linux platform-specifics restricted to tray_linux.cpp. Special features like XDG desktop notifications (which wouldn't have worked with Sunshine anyway due to elevated privileges) have been replaced with Qt-native equivalents. Positioning is currently also fully reliant on Qt-provided features to maintain platform independence.

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 failed

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

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