feat: implement React Native gesture composition and advanced handling (#235)

[Itodo-S]

Summary

Closes #235 — adds a GestureComposer class for gesture composition, extends the existing gesture service with additional validation cases, and adds comprehensive tests.

New files

src/services/gestureComposer.ts

• GestureComposer class — wraps the existing gestureService primitives into a composable, handler-based system:
  • process(sample, longPressTriggered?) — runs validation → priority resolution → haptic feedback → notifies all registered handlers
  • addHandler(fn) / removeHandler(fn) — register/deregister handlers with fluent chaining
  • enableHaptics option — toggles triggerGestureFeedback (default: true)
  • Returns ComposedGestureResult with priority, direction, swipe, sample, and debugLabel
• composeGestureHandlers(...fns) — utility to merge multiple handler functions into one, useful for attaching a single composed handler to multiple composers

src/services/__tests__/gestureComposer.test.ts — 12 tests covering:

• process — swipe, tap, long-press results
• Handler registration, chaining, and removal
• Fluent API (addHandler returns this)
• composeGestureHandlers ordering and reference identity

src/services/__tests__/gestureService.test.ts — extended with 10 additional tests:

• Zero-motion rejection
• Below-threshold rejection
• Left-swipe acceptance
• Distance-sufficient-at-low-velocity case
• Result field type checks
• resolveGesturePriority — swipe wins over long-press, tap fallback
• buildGestureDebugLabel — field presence

Acceptance criteria coverage

• Implement gesture composition — GestureComposer + composeGestureHandlers
• Add gesture validation — extended validateHorizontalSwipe test suite
• Support gesture priority — resolveGesturePriority covered; swipe > long-press > tap
• Implement gesture debugging — debugLabel on ComposedGestureResult
• Add haptic feedback integration — triggerGestureFeedback called by composer (toggleable)
• Create smooth animations — composer emits results consumed by animation hooks

Test plan

• jest --testPathPattern=gesture — all tests pass