experiment: investigate DualSense gyro typing

[nextestudios]

Summary

Investigate pointing at keys with the DualSense gyroscope as an optional input method for the virtual keyboard.

Motivation

Gyro aiming can be faster than the D-pad for text entry.

Requirements

• SDL3 sensor API (SDL_GAMEPAD_SENSOR_GYRO); strictly optional and off by default.
• Sensitivity, calibration, smoothing, deadzone and a recenter button.
• Full fallback: every key reachable with the D-pad; no feature depends on gyro.

Controller UX

Hold a button (e.g. L2) to aim with gyro; South/A types the highlighted key; release to return to D-pad control.

Technical Notes

Sdl3InputBackend sensor enablement; a pointer layer over VirtualKeyboard focus.

Acceptance Criteria

• Prototype behind a setting; document findings in docs/decisions.

Testing

Manual testing on DualSense (USB and Bluetooth).

Dependencies

• Depends on enhancement: redesign the virtual keyboard layout after the PS5 structural model #41 — enhancement: redesign the virtual keyboard layout after the PS5 structural model

---

Priority: low · Milestone: 8 · Experimental