Studio: add favicon to window and about dialog

Goal

Add a favicon to the studio window (displayed in the window title bar and taskbar) and display it in the About dialog, reinforcing the Turian brand.

Context / integration points

• Most professional applications have a favicon in the window and about dialog.
• Turian should have a recognizable icon.
• The About dialog exists; we need to add an image/icon display.
• Window favicon requires OS/window manager integration (depends on the GUI framework).

Design

• Create or use the Turian logo as a favicon (ideally multi-resolution: 16x16, 32x32, 64x64).
• Set the favicon in the window creation code (framework-dependent; might use DVUI or native APIs).
• Update the About dialog to display the favicon prominently.

Tasks

• Ensure Turian logo exists in multiple resolutions (or generate favicon from it)
• Set window favicon in the studio window creation code
• Update About dialog to display the favicon
• Test on different OSes (Windows, macOS, Linux) to verify favicon appears

Acceptance criteria

• Studio window displays a favicon in the title bar and taskbar.
• About dialog shows the favicon prominently.
• Favicon is recognizable and reflects the Turian brand.

Dependencies

Unblocked. Pure branding/polish.

Out of scope

• Custom icon themes or multiple icon variants.
• Dynamic icon updates.