Add FFmpeg updater module and GUI integration

Introduces a new FFmpeg updater module for checking and updating FFmpeg to the latest essentials build, with progress reporting and version comparison. Updates language files with new translation keys for the updater in multiple languages. Refactors Windows FFmpeg installation to use the new updater logic. Adds UpdaterTabWidget to the GUI dialogs for integration of the updater into the application's interface.

src/gui/ytsage_gui_dialogs/ytsage_dialogs_custom.py

@@ -34,6 +34,7 @@ from src.utils.ytsage_constants import YTDLP_DOCS_URL
 from src.utils.ytsage_config_manager import ConfigManager
 from src.utils.ytsage_localization import LocalizationManager, _
 from src.utils.ytsage_logger import logger
+from src.gui.ytsage_gui_dialogs.ytsage_dialogs_updater import UpdaterTabWidget
 
 if TYPE_CHECKING:
     from src.gui.ytsage_gui_main import YTSageApp  # only for type hints (no runtime import)
@@ -516,11 +517,15 @@ class CustomOptionsDialog(QDialog):
 
         language_layout.addStretch()
 
+        # === Updater Tab ===
+        updater_tab = UpdaterTabWidget(self)
+
         # Add tabs to the tab widget
         self.tab_widget.addTab(cookies_tab, _("tabs.cookies"))
         self.tab_widget.addTab(command_tab, _("tabs.custom_command"))
         self.tab_widget.addTab(proxy_tab, _("tabs.proxy"))
         self.tab_widget.addTab(language_tab, _("tabs.language"))
+        self.tab_widget.addTab(updater_tab, _("tabs.updater"))
 
         # Dialog buttons
         button_box = QDialogButtonBox()