[Crazy RoboTaxi] Improve Crazy Robotaxi controller handling

[aidanfnv]

Split off from #553, this change modifies the controller handling to make the game feel better on a controller, such as by restoring analog steering. Previously, to make steering more responsive, it was apparently changed to be digital.

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no outstanding actionable findings identified.

Summary

This PR improves Crazy Robotaxi controller handling and input-source arbitration.

• Restores analog gamepad steering and adds rescaled stick and trigger dead zones.
• Aligns keyboard commands with the shared arcade-driving command shape.
• Smooths direct steering using configured steering and return rates.
• Lets deliberate keyboard input reclaim control without neutral controller events immediately overriding it.
• Adds focused control, gameplay, and input-source tests.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
    K[Keyboard events] --> DI[DriverInput]
    G[Gamepad events] --> DZ[Dead-zone rescaling]
    DZ --> DI
    W[Wheel events] --> DI
    DI --> ARB[Most recent deliberate input arbitration]
    ARB --> DC[DriverCommand]
    DC --> SD[Rate-limited direct steering]
    SD --> VS[Updated vehicle state]

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[aidanfnv]

/ok to test edcfb83

[aidanfnv]

/ok to test fabbef9