feat: add keyboard layout support

programs/include/gui/widgets.hpp

@@ -240,7 +240,8 @@ struct TextBox {
                 cursor--;
                 text[text_len] = '\0';
             }
-        } else if (key.ascii >= 32 && key.ascii < 127) {
+        } else if ((unsigned char)key.ascii >= 32
+                   && (unsigned char)key.ascii != 127) {
             // Printable character
             if (text_len < 254) {
                 for (int i = text_len; i > cursor; i--) {