[codex] Improve trackball scaling control

[cormoran]

Summary

• Replace the trackball scaling multiplier/divisor inputs and presets with a 100-step slider from 0.1x to 10x.
• Add left/right step buttons that move scaling in fixed 0.05x increments for fine adjustment, with integer step math to avoid skipped/stuck values.
• Show scaling values with a fixed two-decimal display such as 3.05x.
• Add left/right step buttons to Sensor Rotation that move rotation in fixed 1° increments.
• Keep saving through the existing multiplier/divisor and rotation runtime processor APIs.

Validation

• npm test -- --runInBand src/pages/__tests__/TrackballPage.test.tsx
• npm run lint
• npm run build
• Checked the Trackball page in demo mode at desktop width.

[github-actions]

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