Emit progress updates during URL analysis and simulate gradual progress for long-running yt-dlp operations. Added QTimer import and a progress_update Signal on AnalysisThread, with emits at multiple analysis milestones (e.g. 15, 30, 60, 70, 85, 90, 92, 95, 100). In AnalysisMixin introduced _analysis_timer and _fake_progress, connected thread progress to _handle_analysis_progress, and implemented a _update_fake_progress timer that slowly advances the progress bar between real updates. Timers are stopped on real progress, completion or error and the UI progress is reset appropriately to improve UX during long extraction steps.
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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