Support Alt+Backspace for word deletion in text areas (#4741)

- **PR Description**
Add support for Alt+Backspace (Option+Backspace on macOS) to delete
entire words in text input areas, matching common text editor behavior.

Author: stefanhaller

pkg/gui/editors.go

@@ -8,6 +8,9 @@ import (
 
 func (gui *Gui) handleEditorKeypress(textArea *gocui.TextArea, key gocui.Key, ch rune, mod gocui.Modifier, allowMultiline bool) bool {
 	switch {
+	case (key == gocui.KeyBackspace || key == gocui.KeyBackspace2) && (mod&gocui.ModAlt) != 0,
+		key == gocui.KeyCtrlW:
+		textArea.BackSpaceWord()
 	case key == gocui.KeyBackspace || key == gocui.KeyBackspace2:
 		textArea.BackSpaceChar()
 	case key == gocui.KeyCtrlD || key == gocui.KeyDelete:
@@ -42,8 +45,6 @@ func (gui *Gui) handleEditorKeypress(textArea *gocui.TextArea, key gocui.Key, ch
 		textArea.GoToStartOfLine()
 	case key == gocui.KeyCtrlE || key == gocui.KeyEnd:
 		textArea.GoToEndOfLine()
-	case key == gocui.KeyCtrlW:
-		textArea.BackSpaceWord()
 	case key == gocui.KeyCtrlY:
 		textArea.Yank()