Update Menu Bar Icon

[mberrishdev]

Description

Design and implement a better tray icon for the menu bar.

Tasks

• Design new icon (template format for macOS)
• Create @2x and @3x versions
• Replace trayIconTemplate.png
• Test icon in light/dark menu bar modes
• Ensure proper icon sizing (16x16 @1x)

Technical Details

• Use template icon (black with transparency)
• macOS will auto-invert for dark mode
• Path: assets/trayIconTemplate.png