Adds OnFileDrop(handler func(paths []string, targetID string)) to PlatformWindow.
trackWindow() now wires file drop callbacks to ActionFilesDropped broadcasts.
Updates both exported MockWindow and unexported mockWindow with the new method.
Wails adapter maps WindowFilesDropped event with DroppedFiles and DropTargetDetails.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Window package is now a full core.Service with typed IPC messages.
Register(Platform) factory closure captures platform adapter for WithService.
OnStartup queries config and registers query/task handlers.
Platform events converted to IPC actions via trackWindow.
Co-Authored-By: Virgil <virgil@lethean.io>
