feat(driver): add Driver.long_press on WDA and Android

driver/android_driver.py

@@ -87,6 +87,17 @@ class AndroidDriver(Driver):
         except Exception as exc:
             raise DriverError("tap failed") from exc
 
+    def long_press(self, x: float, y: float, duration_ms: int = 1200) -> None:
+        # Android ``mobile: longClickGesture`` uses a system-fixed hold
+        # duration; the caller's ``duration_ms`` is intentionally ignored
+        # (see design R2). Verify on real Appium against the running device
+        # driver — see plan task 2.
+        client = self._require_client()
+        try:
+            client.execute_script("mobile: longClickGesture", {"x": x, "y": y})
+        except Exception as exc:
+            raise DriverError("long press failed") from exc
+
     def swipe(
         self,
         start_x: float,