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.
Add a safe blurred-overlay flow for modal dialogs by implementing run_dialog_with_blur and _apply_blur_to_pixmap on YTSageApp. The new flow captures a window screenshot, generates a blurred/dimmed pixmap via a QGraphicsScene + QGraphicsBlurEffect, shows it in an overlay QLabel with a fade-in, runs the dialog, and then removes the overlay.
Replace many direct dialog.exec() calls with run_dialog_with_blur(...) across the main GUI (download settings, about, history, playlist selection, custom options, cookie login, ffmpeg check, time range, setup success dialogs, etc.). Also add imports required for pixmap/graphics handling.
Make animate_widget_fade_in usage safer by checking for the method before calling it and falling back to setVisible(True) for format table and thumbnails to avoid QPainter/graphics-effect conflicts. Small comment/cleanup in fade-in/out methods.
Introduce a shake animation to visually indicate invalid inputs and wire it into validation/error flows. Changes: import QPoint; add animate_widget_shake(QWidget) implementation that uses QPropertyAnimation on widget.pos with keyframes; call the animation when URL/path/format validations fail and replace some direct status_label updates with set_status_message_animated. Updated files: ytsage/gui/ytsage_gui_main.py and ytsage/gui/ytsage_gui_analysis.py.
Use animated show/hide for playlist widgets and harden fade animations. Replace direct setVisible signal handlers with lambdas that call set_widget_visible_animated, and add set_widget_visible_animated to route to fade-in/out. Fade methods now stop opposing animations, reuse existing QGraphicsOpacityEffect when present, preserve current opacity as start values, and set effect opacity when creating a new effect. Also catch possible RuntimeError when stopping animations and keep animation references on widgets to avoid premature GC.
Introduce smooth UI transitions by adding opacity-based animations. Import QGraphicsOpacityEffect and add animate_widget_fade_in, animate_widget_fade_out, and set_status_message_animated to cross-fade status text and fade buttons in/out. Update signal handlers and download flow to use the new animated status setter and fade methods instead of direct setText/setVisible calls. Keep animation references on widgets to avoid premature GC and remove effects after fade-out.
Moved all files from src/gui/ to ytsage/gui/ and updated import statements to use relative imports within the new package structure. This improves modularity and prepares the codebase for distribution as a proper Python package.
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