Replace Electron Frame With Custom SnapDock Frame

[ZFordDev]

Summary

SnapDock currently uses the default Electron window frame.
To match the SnapDock design language and allow more UI control, we want to replace it with a custom frameless window.

Requirements

• Enable frame: false in the Electron BrowserWindow
• Add a custom SnapDock titlebar with:
  • app name
  • drag region
  • minimize button
  • maximize/restore button
  • close button
• Style the titlebar to match SnapDock’s soft UI
• Ensure window dragging works on all platforms
• Ensure buttons work on:
  • Windows
  • macOS
  • Linux

Notes

• This is a medium‑difficulty issue
• It unlocks future features like:
  • theme‑colored titlebars
  • integrated update indicators
  • custom window controls