Hide CRF input when lossless quality is selected

DONE.md

@@ -774,6 +774,7 @@ This file tracks completed features, fixes, and milestones.
 - ✅ Fixed stats bar updates to run on the UI thread to avoid Fyne warnings
 - ✅ Defaulted Target Aspect Ratio back to Source unless user explicitly sets it
 - ✅ Synced Target Aspect Ratio between Simple and Advanced menus
+- ✅ Hide manual CRF input when Lossless quality is selected
 - ✅ Stabilized video seeking and embedded rendering
 - ✅ Improved player window positioning
 - ✅ Fixed clear video functionality

TODO.md

@@ -48,6 +48,7 @@ This file tracks upcoming features, improvements, and known issues.
   - Stats bar updates run on the UI thread
   - Target aspect default enforced as Source unless user changes it
   - Target aspect sync across simple/advanced menus
+  - Hide manual CRF entry when Lossless quality is active
 
 ## Priority Features for dev20+
 

main.go

@@ -6581,6 +6581,7 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 	updateQualityVisibility = func() {
 		hide := strings.Contains(strings.ToLower(state.convert.SelectedFormat.Label), "h.265") ||
 			strings.EqualFold(state.convert.VideoCodec, "H.265")
+		hideCRF := strings.EqualFold(state.convert.Quality, "Lossless")
 
 		if qualitySectionSimple != nil {
 			if hide {
@@ -6596,6 +6597,13 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 				qualitySectionAdv.Show()
 			}
 		}
+		if crfContainer != nil {
+			if hideCRF {
+				crfContainer.Hide()
+			} else {
+				crfContainer.Show()
+			}
+		}
 	}
 
 	// Simple mode options - minimal controls, aspect locked to Source