Improves edge scroll and drag handling

Increases edge scrolling speed for improved user experience.

Refactors header drag event handling to use handler methods for better organization.

src/managers/EdgeScrollManager.ts

@@ -22,8 +22,8 @@ export class EdgeScrollManager {
   // Constants - fixed values as per requirements
   private readonly OUTER_ZONE = 100;        // px from edge (slow zone)
   private readonly INNER_ZONE = 50;         // px from edge (fast zone)
-  private readonly SLOW_SPEED_PXS = 80;    // px/sec in outer zone
-  private readonly FAST_SPEED_PXS = 240;   // px/sec in inner zone
+  private readonly SLOW_SPEED_PXS = 140;    // px/sec in outer zone
+  private readonly FAST_SPEED_PXS = 640;   // px/sec in inner zone
 
   constructor(private eventBus: IEventBus) {
     this.init();