Fix backspace handling on Android.

cmd/pad/main.go

@@ -120,11 +120,16 @@ func run(w *app.Window) error {
 								})
 							}
 						case key.EditEvent:
-							log.Printf("edit event: %v", k.Text)
+							log.Printf("edit event text: %q", k.Text)
 							events = append(events, ui.InputEvent{
 								Handler: reg.Handler,
 								Data:    k,
 							})
+						case key.SnippetEvent:
+							log.Printf("snippet event: %v", k)
+							// Handle snippet event if necessary, or ignore
+						default:
+							log.Printf("unexpected event type: %T", k)
 						}
 					}
 				}

internal/editor/state.go

@@ -300,11 +300,16 @@ func HandleCursorMove(delta int) {
 // HandleKeyDown interprets keyboard events for navigation and editing.
 // Receives both key.Event (as key.Name) and key.EditEvent from the main loop.
 func HandleKeyDown(data any) {
+	log.Printf("HandleKeyDown: received data of type %T: %v", data, data)
 	switch v := data.(type) {
 	case key.EditEvent:
 		// Text input from IME / keyboard
 		log.Printf("HandleKeyDown: EditEvent text=%q", v.Text)
-		HandleInsert(v.Text)
+		if v.Text == "\b" || len(v.Text) == 0 {
+			HandleBackspace()
+		} else {
+			HandleInsert(v.Text)
+		}
 	case key.Name:
 		log.Printf("HandleKeyDown: name=%q", v)
 		switch v {
@@ -553,6 +558,7 @@ func HandleInsert(s string) {
 
 // HandleBackspace removes the character before the cursor.
 func HandleBackspace() {
+	log.Printf("HandleBackspace: CursorPosition=%d", TheState.Editor.CursorPosition)
 	pos := TheState.Editor.CursorPosition
 	if pos == 0 {
 		return