Ghostree v0.3.17

Upstream sync + Ghostree fixes:

• Fix crash when adding tab from tab overview
• Fix diff panel transparency when toggled
• Suppress loading spinner during background diff sidebar refreshes
• Fix settings window layout (remove empty toolbar, use fixed frame)
• Fix Tab key navigation in new worktree sheet
• Bump embedded worktrunk from 0.22.0 to 0.27.0
• Use host bundle defaults for dock icon
• Show title override in command palette jump commands
• NSDockTilePlugin for dynamic dock icons
• Inline tab title editing on double-click
• Inactive window tint overlay for liquid glass
• Refined macOS surface drag handle UI
• Fix new tab crash
• Fix glass tinting when theme changes
• Cursor style and visibility shader uniforms
• Grapheme width change detection
• Unicode 17 support (uucode 0.2.0)
• Sign DockTilePlugin in local release script