Add open_logs and logs_tooltip localization entries across multiple language JSON files (ar, de, en, es, fr, hi, id, it, ja, pl, pt, ru, tr, zh) so the About/System Info UI can expose an action to open the application logs folder. Also add an "about" section to ytsage/utils/ytsage_localization.py with default entries (open_logs, logs_tooltip, refresh). This wires the logs-folder UI text into the localization system.
Introduce an opt-in beta updates feature: add a styled "Receive Beta Updates" checkbox in the Updater UI with i18n strings, load/save logic in the custom options dialog, and a default config key (check_beta_updates=false).
Add _fetch_github_beta_version to the update thread to query GitHub releases (selecting the highest tag) and emit update_available for newer beta builds. When beta checking is enabled, the thread will perform the GitHub beta check and return early to avoid conflicting with the PyPI check. This enables users to opt into preview releases safely.
Introduce a new filename_format setting and UI to control yt-dlp output templates. ConfigManager now includes a default filename_format (%(title)s_%(resolution)s.%(ext)s). The DownloadSettingsDialog exposes a text input and help text for the format and saves the value to ConfigManager. DownloadThread now accepts a filename_format argument and uses it when building output templates for single videos and playlists. YTSageApp reads the config and passes the filename format into the download thread. Added corresponding English language strings.
Moved utility modules from src/utils/ to ytsage/utils/ and updated all relative imports accordingly. Adjusted docstring usage examples and fixed a path reference in LocalizationManager to reflect the new directory structure.
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