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.
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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