Add video interaction: double-click fullscreen and right-click play/pause

Implements intuitive video player interactions for enhanced user experience.

Video Interaction Features:
- Double-click video area to toggle fullscreen
- Right-click video area to play/pause
- Single-click does nothing (reserved for future use)
- Transparent tappable overlay on video canvas

Implementation:
- Created TappableOverlay widget in internal/ui/tappable.go
- Invisible widget captures tap, double-tap, and secondary-tap events
- Extends widget.BaseWidget for Fyne compatibility
- Added overlay to stage container after video image

User Experience:
- Double-click anywhere on video → instant fullscreen
- Right-click anywhere on video → quick play/pause
- Works alongside existing keyboard shortcuts (F11, Space, ESC)
- Play button icon updates when using right-click

Technical Details:
- TappableOverlay has no visual representation
- Implements Tapped(), DoubleTapped(), TappedSecondary()
- Callbacks are configurable per instance
- Positioned as top layer in container.NewMax() stack

Usage:
1. Load a video
2. Double-click video to enter fullscreen
3. Right-click to pause/play
4. ESC or F11 to exit fullscreen

Next Steps:
- Consider adding single-click functionality
- Add visual feedback for interactions
- Implement mouse cursor auto-hide in fullscreen

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

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

internal/ui/tappable.go

@@ -0,0 +1,64 @@
+package ui
+
+import (
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/widget"
+)
+
+// TappableOverlay is an invisible widget that captures tap and double-tap events
+type TappableOverlay struct {
+	widget.BaseWidget
+	OnTapped         func()
+	OnDoubleTapped   func()
+	OnSecondaryTapped func()
+}
+
+// NewTappableOverlay creates a new tappable overlay
+func NewTappableOverlay(onTapped, onDoubleTapped, onSecondaryTapped func()) *TappableOverlay {
+	t := &TappableOverlay{
+		OnTapped:         onTapped,
+		OnDoubleTapped:   onDoubleTapped,
+		OnSecondaryTapped: onSecondaryTapped,
+	}
+	t.ExtendBaseWidget(t)
+	return t
+}
+
+// Tapped handles single tap events
+func (t *TappableOverlay) Tapped(*fyne.PointEvent) {
+	if t.OnTapped != nil {
+		t.OnTapped()
+	}
+}
+
+// TappedSecondary handles right-click events
+func (t *TappableOverlay) TappedSecondary(*fyne.PointEvent) {
+	if t.OnSecondaryTapped != nil {
+		t.OnSecondaryTapped()
+	}
+}
+
+// DoubleTapped handles double-tap events
+func (t *TappableOverlay) DoubleTapped(*fyne.PointEvent) {
+	if t.OnDoubleTapped != nil {
+		t.OnDoubleTapped()
+	}
+}
+
+// CreateRenderer implements fyne.Widget
+func (t *TappableOverlay) CreateRenderer() fyne.WidgetRenderer {
+	return &tappableRenderer{}
+}
+
+// MinSize returns minimum size (should fill parent)
+func (t *TappableOverlay) MinSize() fyne.Size {
+	return fyne.NewSize(1, 1)
+}
+
+type tappableRenderer struct{}
+
+func (r *tappableRenderer) Layout(size fyne.Size)            {}
+func (r *tappableRenderer) MinSize() fyne.Size               { return fyne.NewSize(1, 1) }
+func (r *tappableRenderer) Refresh()                         {}
+func (r *tappableRenderer) Objects() []fyne.CanvasObject     { return nil }
+func (r *tappableRenderer) Destroy()                         {}

main.go

@@ -1068,6 +1068,34 @@ func (s *appState) showPlayerView() {
 			})
 		}
 
+		// Add tappable overlay to stage for video interactions
+		// Double-click toggles fullscreen, right-click plays/pauses
+		videoTapper := ui.NewTappableOverlay(
+			nil, // Single tap does nothing for now
+			func() {
+				// Double-tap: toggle fullscreen
+				s.toggleFullscreen()
+			},
+			func() {
+				// Right-click: toggle play/pause
+				if !ensureSession() {
+					return
+				}
+				if s.playerPaused {
+					s.playSess.Play()
+					s.playerPaused = false
+					playBtn.SetText(ui.IconPause)
+				} else {
+					s.playSess.Pause()
+					s.playerPaused = true
+					playBtn.SetText(ui.IconPlayArrow)
+				}
+			},
+		)
+
+		// Add tapper to stage
+		stage.Objects = append(stage.Objects, videoTapper)
+
 		playerArea = container.NewBorder(
 			nil,
 			container.NewVBox(container.NewPadded(progressBar), container.NewPadded(controlRow)),