[Feature]: Add Gesture config

### Pre-flight checklist

- [x] I searched existing issues and the [Roadmap](https://github.com/AprilNEA/OpenLogi#roadmap), and this isn't already tracked.

### Problem / motivation

Gesture thresholds / deadzone and hold duration are defined as 'Magic' constants

### Proposed solution

include :
- GESTURE_SWIPE_THRESHOLD
- GESTURE_SWIPE_DEADZONE
- GESTURE_HOLD_FOR_SWIPE

in config model

### Alternatives considered

_No response_

### Related area(s)

- [x] GUI
- [ ] CLI
- [ ] Button actions / remapping
- [ ] DPI
- [ ] SmartShift
- [ ] Per-application profiles
- [x] Configuration (TOML)
- [ ] Auto-update
- [ ] Other

### Additional context

config, gesture

Locate the gesture code containing the magic threshold, deadzone, and hold-duration constants, then find the configuration model and TOML loading path. Add these three settings to the model and verify that gesture behavior uses configured values and that TOML parsing succeeds.

Written by the indexing model from the issue text.