Resolves: #338

Summary

This PR adds comprehensive software control for dials in the StreamController UI, including drag-to-turn functionality, keyboard shortcuts, and a context menu for dial management.

Changes

• Drag-to-turn functionality: Users can now click and drag on dials to turn them naturally with circular gesture detection
• Keyboard shortcuts: Left/Right arrow keys turn dials when focused
• Context menu: Right-click menu with copy, cut, paste, remove, and update actions
• Visual feedback: Cursor changes (grab/grabbing) to indicate interactivity
• Angle-based rotation: Mathematical calculations for natural knob turning behavior

Technical Details

• Added Gtk.GestureDrag controller for drag interactions
• Implemented angle calculations using math.atan2() for circular motion detection
• Added Gio actions and keyboard shortcuts for software control
• Created DialContextMenu class with proper menu structure
• Integrated with existing dial event system using DialEventType.TURN

Files Modified

• src/windows/mainWindow/DeckPlus/DialBox.py: Added 242 lines of new functionality

Testing

• Verified drag-to-turn works with circular gestures
• Confirmed keyboard shortcuts trigger proper dial events
• Tested context menu actions (copy, cut, paste, remove, update)
• No CSS warnings or runtime errors

Usage

1. Drag to turn: Click and drag on any dial in a circular motion
2. Keyboard control: Focus a dial and use Left/Right arrow keys
3. Context menu: Right-click for dial management options

This enhancement makes the StreamController much more user-friendly for testing and configuration by providing intuitive software control over dial inputs.