Standardize macOS detection and prompt on close

[hupochun]

#1151

Unify platform checks to use Q_OS_MACOS for Qt6 compatibility and switch the QtScrcpyCore submodule URL to HTTPS for easier cloning. Introduce a confirmation dialog on window close that lets users choose between minimizing to tray or exiting the app.

Improve project hygiene by extending .gitignore rules for IDE and cache files, adding missing QDebug includes, and applying minor formatting tweaks for consistency.

Standardize macOS detection and add close prompt

Unify all platform checks to Q_OS_MACOS for Qt6 compatibility. Switch submodule URL to HTTPS for easier cloning. Introduce a close confirmation dialog letting users minimize to tray or exit. Improve project hygiene: extend .gitignore for IDE/cache files, add missing QDebug includes, and apply formatting tweaks.

[barry-ran]

一个独立的功能提一个独立的pr，不要多个功能混在一起提一个pr