Bump version to 4.9.1

Update version references from 4.9.0 to 4.9.1 in documentation, __init__.py, AboutDialog, and main application window to prepare for new release.

src/gui/ytsage_gui_dialogs/ytsage_dialogs_base.py

@@ -159,7 +159,7 @@ class AboutDialog(QDialog):
         layout.addWidget(title_label)
 
         version_label = QLabel(
-            f"<span style='color: #cccccc; font-size: 13px; font-weight: normal;'>{_('about.version', version=getattr(self._parent, 'version', '4.9.0'))}</span>"
+            f"<span style='color: #cccccc; font-size: 13px; font-weight: normal;'>{_('about.version', version=getattr(self._parent, 'version', '4.9.1'))}</span>"
         )
         version_label.setAlignment(Qt.AlignmentFlag.AlignCenter)
         layout.addWidget(version_label)

src/gui/ytsage_gui_main.py

@@ -78,7 +78,7 @@ class YTSageApp(QMainWindow, FormatTableMixin, VideoInfoMixin):  # Inherit from
         else:
             logger.info(f"Using yt-dlp from: {ytdlp_path}")
 
-        self.version = "4.9.0"
+        self.version = "4.9.1"
         self.check_for_updates()
 
         # Check for auto-updates if enabled