fix: return file path if GeneratedImage.save() succeeds

src/gemini_webapi/types/image.py

@@ -136,7 +136,7 @@ def validate_cookies(cls, v: dict) -> dict:
         return v
 
     # @override
-    async def save(self, **kwargs) -> None:
+    async def save(self, **kwargs) -> str | None:
         """
         Save the image to disk.
 
@@ -147,8 +147,13 @@ async def save(self, **kwargs) -> None:
             And since the URL ends with a long hash, by default will use timestamp + end of the hash as the filename.
         kwargs: `dict`, optional
             Other arguments to pass to `Image.save`.
+
+        Returns
+        -------
+        `str | None`
+            Absolute path of the saved image if successfully saved.
         """
-        await super().save(
+        return await super().save(
             filename=kwargs.pop("filename", None)
             or f"{datetime.now().strftime('%Y%m%d%H%M%S')}_{self.url[-10:]}.png",
             cookies=self.cookies,