fix(anchor): preserve prompt line when reading user input

After reading user input in Reads(), clear the blank line created by
Enter and position cursor correctly without erasing the prompt line.
This prevents duplicate anchor lines and maintains proper TUI state.

Author: streambinder

sys/anchor/window.go

@@ -167,5 +167,13 @@ func (window *Window) Reads(label string, a ...interface{}) (value string) {
 	value = strings.TrimSpace(value)
 	value = strings.Trim(value, "\n")
 	value = strings.Trim(value, "\r")
+
+	// Clear the blank line created by Enter, then move up to the prompt line without clearing it
+	if !window.plain {
+		cursor.ClearLine()
+		cursor.Up(1)
+		cursor.StartOfLine()
+	}
+
 	return value
 }