🎨 Palette: Add 'Reset Camera' shortcut (R)

[TECHNICANGEL]

💡 What: Added a "Reset Camera" feature triggered by the 'R' key.
🎯 Why: Users can easily get lost or disoriented in 3D space. This provides a quick way to return to the initial view.
📸 Before/After: N/A (Functional change, visible in window title)
♿ Accessibility: Reduces cognitive load and frustration for users navigating complex 3D scenes.

Implementation Details:

• Modified Camera class to store initial state (position, yaw, pitch, FOV).
• Added Camera::reset() method.
• Updated RacingEngine::keyCallback in main.cpp to handle 'R' key.
• Ensures accumulation buffer is cleared and mouse state is reset to prevent artifacts and jumping.
• Updates window title immediately with feedback.
• Fixed a build error caused by duplicate variable declarations in src/main.cpp.

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PR created automatically by Jules for task 17260256978977837176 started by @TECHNICANGEL

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