fix(ui): Enable text wrapping for batch settings toggle button

Fixed Issue:
- "Hide Batch Settings" button text was overflowing beyond button boundary
- Text was truncated and hard to read in narrow layouts

Solution:
- Created wrapped label overlay on button using container.NewStack
- Label has TextWrapWord enabled for automatic line breaking
- Maintains button click functionality while improving readability
- Text now wraps to multiple lines when space is constrained

Files Changed:
- main.go: Batch settings toggle button (lines 6858-6879)

Reported-by: User (screenshot showing text overflow)

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

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

main.go

@@ -6855,21 +6855,31 @@ func buildConvertView(state *appState, src *videoSource) fyne.CanvasObject {
 	settingsContent.Hide()
 
 	settingsVisible := false
+	toggleSettingsLabel := widget.NewLabel("Show Batch Settings")
+	toggleSettingsLabel.Wrapping = fyne.TextWrapWord
+	toggleSettingsLabel.Alignment = fyne.TextAlignCenter
+
 	var toggleSettingsBtn *widget.Button
-	toggleSettingsBtn = widget.NewButton("Show Batch Settings", func() {
+	toggleSettingsBtn = widget.NewButton("", func() {
 		if settingsVisible {
 			settingsContent.Hide()
-			toggleSettingsBtn.SetText("Show Batch Settings")
+			toggleSettingsLabel.SetText("Show Batch Settings")
 		} else {
 			settingsContent.Show()
-			toggleSettingsBtn.SetText("Hide Batch Settings")
+			toggleSettingsLabel.SetText("Hide Batch Settings")
 		}
 		settingsVisible = !settingsVisible
 	})
 	toggleSettingsBtn.Importance = widget.LowImportance
 
-	settingsBox := container.NewVBox(
+	// Replace button text with wrapped label
+	toggleSettingsBtnWithLabel := container.NewStack(
 		toggleSettingsBtn,
+		container.NewPadded(toggleSettingsLabel),
+	)
+
+	settingsBox := container.NewVBox(
+		toggleSettingsBtnWithLabel,
 		settingsContent,
 		widget.NewSeparator(),
 	)