[Sayzx]

Motivation

AirPodsDesktop is Windows-only. This PR adds Linux x64 support so the same AirPods status, lid popup and battery display work on BlueZ-based desktops.

Behaviour changes

• Linux backend: Bluetooth discovery, connection state and advertisements go through BlueZ over D-Bus. Media control, autostart and quick connect have Linux implementations behind the existing platform interfaces.
• Scanner lifetime (all platforms): the advertisement scanner keeps running while a device is bound, even when it is disconnected. Before, it stopped on disconnect, and advertisements were ignored until the device reconnected.
• Connect on lid open (all platforms): opening the case with the bound device disconnected asks the OS to connect it. Device::Connect() is a no-op by default, so Windows still relies on the OS to connect.
• Lid popup: the window follows the lid state alone. Pods taken out of the case with the lid open show the window and replay the animation.
• Animation (all platforms): the video stays loaded while the window is hidden and restarts from the beginning on show, instead of reloading the file each time.

No settings, ABI or persisted data changed. kFieldsAbiVersion is untouched.

Packaging

• Packaging/Linux/make-bundle.sh: a self-contained directory and tarball with the Qt libraries and plugins the application loads.
• Packaging/Linux/make-deb.sh: a .deb that installs under /opt, exposes /usr/bin/AirPodsDesktop, and declares the system libraries it needs.
• Docs/Build.md: Linux prerequisites, build steps and both packages.

Testing

• Ubuntu 24.04, GCC 13.3, Qt 6.8.3, BlueZ 5.72, X11.
• ctest: all 13 suites pass, including the new LinuxPlatformTests.
• Manual: AirPods Pro connected and bound. Connect on lid open, popup on lid open, popup and animation replay when pods leave the case. The extracted .deb starts with the French locale. The .deb was installed with sudo apt install ./<file>.deb on the same Ubuntu 24.04 machine and the app runs from the menu.

Not tested

• Windows is not built or tested by this PR. The shared paths above (scanner lifetime, connect on lid open, lid popup, animation playback) also run on Windows and need a check there.
• Other AirPods models, Wayland sessions, and other distributions. The .deb dependency list comes from the Ubuntu 24.04 package names.

Notes for review

• The commits are split into the Linux port, packaging and docs, and README credits. The port commit mixes the shared-behaviour changes listed above with the Linux backend, because they touch the same files.
• The Linux port adds Qt6::DBus on Linux only. BlueZ must be running at runtime.

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