🔨 Use dependency injection for Platform to facilitate unit testing

[guiyanakuang]

close #2739

[Copilot]

Pull Request Overview

This PR refactors desktop modules to inject Platform via DI rather than calling getPlatform(), enabling easier unit testing.

• Added Platform constructor parameters and removed direct getPlatform() calls across desktop services and utilities
• Updated Koin DI bindings to provide Platform and wire it through factories
• Introduced PlatformProvider interface and consolidated Platform data class

Reviewed Changes

Copilot reviewed 50 out of 50 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
DesktopPasteboardService.kt	Inject Platform into factory and replace getPlatform()
DesktopShortcutKeysLoader.kt	Pass Platform to getDesktopKeyboardKeys
DesktopShortcutKeysListener.kt	Pass Platform to getDesktopKeyboardKeys
DesktopShortcutKeys.kt	Accept Platform and AppPathProvider in constructor
DesktopKeyboardKeys.kt	Change getDesktopKeyboardKeys() signature to take Platform
DesktopThumbnailLoader.kt	Inject Platform and remove getPlatform()
DesktopFileExtLoader.kt	Inject Platform and remove getPlatform()
DesktopSimpleConfigFactory.kt	Inject AppPathProvider
DesktopAppWindowManager.kt	Inject Platform and remove direct call
DesktopAppStartUpService.kt	Inject Platform and update platform checks
DesktopAppRestartService.kt	Convert from object to class with DI for Platform and AppPathProvider
DesktopAppLaunch.kt	Convert from object to class with DI for Platform and AppPathProvider
DesktopCrossPasteModule.kt	Provide Platform in DI graph and update bindings
CrossPaste.kt	Bootstrap Platform via DesktopPlatformProvider
MarketingSyncManager.kt	Import Platform.Companion.MACOS/WINDOWS
MarketingNearbyDeviceManager.kt	Import Platform.Companion.LINUX
PlatformProvider.kt	Add PlatformProvider interface
Platform.kt	Define serializable Platform data class
EndpointInfoFactory.kt	Inject Platform and remove getPlatform()
build.gradle.kts	Add kotlinx.coroutines.test dependency

Comments suppressed due to low confidence (1)

app/src/desktopMain/kotlin/com/crosspaste/paste/DesktopPasteboardService.kt:21

• Add unit tests for each branch of getDesktopPasteboardService (macOS, Windows, Linux, fallback) to verify correct service is instantiated based on the injected Platform.

return if (platform.isMacos()) {