Restore target size reduction presets

DONE.md

@@ -821,6 +821,7 @@ This file tracks completed features, fixes, and milestones.
 - ✅ Reset now restores full default convert settings even with no config file
 - ✅ Reset now forces resolution and frame rate back to Source
 - ✅ Fixed reset handler scope for convert tabs
+- ✅ Restored 25%/33%/50%/75% target size reduction presets
 - ✅ Stabilized video seeking and embedded rendering
 - ✅ Improved player window positioning
 - ✅ Fixed clear video functionality

TODO.md

@@ -54,6 +54,7 @@ This file tracks upcoming features, improvements, and known issues.
   - Reset restores full default convert settings
   - Reset forces resolution/frame rate back to Source
   - Reset handler scope fixed for convert tabs
+  - Target size reduction presets restored (25/33/50/75%)
 
 ## Priority Features for dev20+
 

main.go

@@ -6208,6 +6208,7 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 		srcSizeMB := float64(srcSize) / (1024 * 1024)
 
 		// Calculate smart reductions
+		size25 := int(srcSizeMB * 0.75) // 25% reduction
 		size33 := int(srcSizeMB * 0.67) // 33% reduction
 		size50 := int(srcSizeMB * 0.50) // 50% reduction
 		size75 := int(srcSizeMB * 0.25) // 75% reduction
@@ -6223,6 +6224,9 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 		if size33 > 15 {
 			options = append(options, fmt.Sprintf("%dMB (33%% smaller)", size33))
 		}
+		if size25 > 20 {
+			options = append(options, fmt.Sprintf("%dMB (25%% smaller)", size25))
+		}
 
 		// Add common sizes
 		options = append(options, "25MB", "50MB", "100MB", "200MB", "500MB", "1GB")