Perf & UI/UX: Animation optimization and petting refinement

[mx57]

This update focuses on performance optimizations and UX refinements as part of the Bolt agent mission.

⚡ Performance Improvements

• Animation Path Caching: Implemented _path_cache in AnimationManager to memoize os.path.exists checks. This significantly reduces system calls when the pet is frequently changing states or selecting random animation variations.
• Micro-optimizations: Removed redundant QPoint instantiation in AnimationManager.set_mouse_pos which was being called on every mouse move event.

🎨 UI/UX Refinements

• Intentional Petting: Updated InputManager to require at least 30px of mouse movement over the pet and a 500ms cooldown for "petting" to count. This prevents passive point farming and makes the interaction feel more like a real "stroke" gesture.
• Stats Layout Fix: Corrected a layout bug in StatsDialog where total points and record KPS were not properly added to the layout, making them invisible. They are now aligned in a single horizontal row for better readability.

🧪 Verification

• Unit Tests: All existing tests passed (python3 -m unittest discover tests).
• Visual Verification: Generated offscreen screenshots of the StatsDialog proving that the points and KPS are now visible and correctly aligned.
• Manual Logic Check: Verified that petting increments now strictly follow the new movement/time rules.

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PR created automatically by Jules for task 6615065163744060581 started by @mx57

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