UX improvements, logging cleanup, and anti-exploit measures

[mx57]

This PR addresses several UI/UX issues, cleans up redundant code, and adds security measures to the interaction logic.

🎨 UI/UX Improvements

• StatsDialog Layout: Fixed an issue where the general stats (total points and max KPS) were not being added to the main layout. Now they are neatly displayed in a horizontal row.
• Achievement Progress: Replaced the simple text-based progress (e.g., "(5/10)") with a clean, green QProgressBar. This provides much better visual feedback for users working towards achievements.

🛡️ Anti-Exploit Measures

• Petting Logic: Refined the petting detection in InputManager. It now requires active mouse movement (minimum 30px) and has a 500ms cooldown between increments. This prevents users from "farming" points by simply hovering the mouse over the pet.

🧹 Code Cleanup & Stability

• Redundant Logging: Identified and removed duplicate log_event calls. Previously, actions like feeding or starting a Pomodoro were being logged twice.
• Deprecated Code: Replaced calls to the deprecated flush_points() method with the more comprehensive flush_all().
• Level-up Logging: Ensured level-up events are only logged once.

🧪 Testing & Verification

• Unit Tests: All existing tests passed.
• Visual Verification: Generated screenshots of the new StatsDialog using a dedicated verification script. The progress bars and layout fixes are confirmed.
• Manual Review: Code was reviewed for potential runtime errors and undefined references (verified that get_level_info and flush_all are properly defined and imported).

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PR created automatically by Jules for task 5353630166742689363 started by @mx57

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