Switch update checks from GitHub API to PyPI

Update logic in updater dialog and main app to fetch latest version info from PyPI instead of GitHub API, avoiding rate limiting issues. Changelog is now fetched from GitHub only as a fallback, improving reliability of update checks.

src/gui/ytsage_gui_main.py

@@ -1087,20 +1087,36 @@ class YTSageApp(QMainWindow, FormatTableMixin, VideoInfoMixin):  # Inherit from
 
     def check_for_updates(self) -> None:
         try:
-            # Get the latest release info from GitHub
+            # Get the latest version info from PyPI (no rate limiting unlike GitHub API)
             response = requests.get(
-                "https://api.github.com/repos/oop7/YTSage/releases/latest",
-                headers={"Accept": "application/vnd.github.v3+json"},
+                "https://pypi.org/pypi/ytsage/json",
+                timeout=10,
             )
             response.raise_for_status()
 
-            latest_release = response.json()
-            latest_version = latest_release["tag_name"].lstrip("v")
+            pypi_data = response.json()
+            latest_version = pypi_data["info"]["version"]
 
             # Compare versions
             if version.parse(latest_version) > version.parse(self.version):
-                changelog = latest_release.get("body", "No changelog available.")  # Get changelog body
-                self.show_update_dialog(latest_version, latest_release["html_url"], changelog)  # Pass changelog
+                release_url = "https://github.com/oop7/YTSage/releases/latest"
+                
+                # Try to fetch changelog from GitHub (with fallback if rate-limited)
+                changelog = "View the full changelog on the [GitHub Releases](https://github.com/oop7/YTSage/releases) page."
+                try:
+                    gh_response = requests.get(
+                        "https://api.github.com/repos/oop7/YTSage/releases/latest",
+                        headers={"Accept": "application/vnd.github.v3+json"},
+                        timeout=5,
+                    )
+                    if gh_response.status_code == 200:
+                        gh_data = gh_response.json()
+                        changelog = gh_data.get("body", changelog)
+                except Exception:
+                    # Silently fallback to static message if GitHub API fails (rate limit, etc.)
+                    pass
+                
+                self.show_update_dialog(latest_version, release_url, changelog)
         except Exception as e:
             logger.exception(f"Failed to check for updates: {e}")