Force reset to restore source resolution and frame rate

DONE.md

@@ -819,6 +819,7 @@ This file tracks completed features, fixes, and milestones.
 - ✅ Upscale now recomputes target dimensions from the preset to ensure 2X/4X apply
 - ✅ Added unit selector for manual video bitrate entry
 - ✅ Reset now restores full default convert settings even with no config file
+- ✅ Reset now forces resolution and frame rate back to Source
 - ✅ Stabilized video seeking and embedded rendering
 - ✅ Improved player window positioning
 - ✅ Fixed clear video functionality

TODO.md

@@ -52,6 +52,7 @@ This file tracks upcoming features, improvements, and known issues.
   - Upscale target dimensions recomputed from preset for 2X/4X reliability
   - Manual video bitrate uses a unit selector (KB/MB/GB)
   - Reset restores full default convert settings
+  - Reset forces resolution/frame rate back to Source
 
 ## Priority Features for dev20+
 

main.go

@@ -6860,6 +6860,7 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 		resolutionSelectSimple.SetSelected(state.convert.TargetResolution)
 		resolutionSelect.SetSelected(state.convert.TargetResolution)
 		frameRateSelect.SetSelected(state.convert.FrameRate)
+		updateFrameRateHint()
 		motionInterpCheck.SetChecked(state.convert.UseMotionInterpolation)
 		syncAspect(state.convert.OutputAspect, false)
 		aspectOptions.SetSelected(state.convert.AspectHandling)
@@ -6880,6 +6881,13 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 		if updateDVDOptions != nil {
 			updateDVDOptions()
 		}
+		// Re-apply defaults in case DVD options toggled any locks
+		state.convert.TargetResolution = "Source"
+		state.convert.FrameRate = "Source"
+		resolutionSelectSimple.SetSelected("Source")
+		resolutionSelect.SetSelected("Source")
+		frameRateSelect.SetSelected("Source")
+		updateFrameRateHint()
 		if updateEncodingControls != nil {
 			updateEncodingControls()
 		}