perf(ui): Increase scroll speed from 5x to 8x

- Increased scroll speed multiplier to 8x for faster navigation
- Balances speed with stability - fast enough to navigate quickly
- Without being so fast that it becomes hard to control

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

internal/ui/components.go

@@ -460,11 +460,11 @@ func (f *FastVScroll) CreateRenderer() fyne.WidgetRenderer {
 }
 
 func (f *FastVScroll) Scrolled(ev *fyne.ScrollEvent) {
-	// Multiply scroll speed by 5x for much faster scrolling
+	// Multiply scroll speed by 8x for fast navigation without instability
 	fastEvent := &fyne.ScrollEvent{
 		Scrolled: fyne.Delta{
-			DX: ev.Scrolled.DX * 5.0,
-			DY: ev.Scrolled.DY * 5.0,
+			DX: ev.Scrolled.DX * 8.0,
+			DY: ev.Scrolled.DY * 8.0,
 		},
 	}
 	f.scroll.Scrolled(fastEvent)

main.go

@@ -8479,7 +8479,7 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 	// Wrap simple options with settings box at top
 	simpleWithSettings := container.NewVBox(settingsBox, simpleOptions)
 
-	// Both Simple and Advanced get their own fast scrolling (5x speed)
+	// Both Simple and Advanced get their own fast scrolling (8x speed)
 	simpleScrollBox := ui.NewFastVScroll(simpleWithSettings)
 	advancedScrollBox := ui.NewFastVScroll(advancedOptions)
 

settings_module.go

@@ -165,7 +165,7 @@ func buildSettingsView(state *appState) fyne.CanvasObject {
 	)
 	tabs.SetTabLocation(container.TabLocationTop)
 
-	// Single fast scroll container for entire tabs area (5x speed)
+	// Single fast scroll container for entire tabs area (8x speed)
 	scrollableTabs := ui.NewFastVScroll(tabs)
 
 	return container.NewBorder(topBar, bottomBar, nil, nil, scrollableTabs)