Changed mouse grab button from Left to Right for FreeCamera

[Breakdown-Dog]

Objective

• Currently, the FreeCamera uses MouseButton::Left for cursor grabbing, which risks input conflicts, for example, if scene selection tools are introduced, as both actions would map to the same trigger.
• Remapping this to MouseButton::Right aligns with industry-standard interaction paradigms (e.g., Unity, Unreal, Blender), where the right mouse button is reserved for view manipulation, leaving the left button exclusively for object selection and UI interaction."

Solution

• Changed mouse grab button from Left to Right for FreeCamera

Testing

• The free_camera_controller example works properly.
• CI

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[mgi388]

All the uses of this controller in my code also change this to mouse_key_cursor_grab: MouseButton::Right, so leaving an approval as someone who also experienced this friction.

[kfc35]

I will click approve for correctness (I tested it out and it works as expected), but I do want to note for Mac trackpad users like myself:

The “scroll” gesture is done with two fingers, and the “right mouse click” gesture is done with two fingers and a button press. With this new default setting, it can be trickier to do the cursor grab without also affecting the speed inadvertently. Not impossible, just adds a bit more difficulty.

However, since the setting can be easily changed for individual use cases, this is not a blocker. I agree that we should not cause undue friction by deviating from standard controls elsewhere