Add gesture component primitives

[Kyle-Ye]

Summary

• Reorganize component sources into Components, Gate, and Track groups.
• Add expiration, event source, map/reduce/repeat, threshold, timeout, and velocity components.
• Add duration and separation-distance gates, Interpolatable support, and GestureOutput metadata helpers.
• Expand unit coverage for the new component and gate behavior.

Testing

• Not run (not requested).

[codecov-commenter]

Codecov Report

❌ Patch coverage is 88.04805% with 199 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.00%. Comparing base (10dfc32) to head (afe4a12).

Files with missing lines	Patch %	Lines
...omponent/Components/ExpirationComponentTests.swift	85.83%	34 Missing ⚠️
...s/Component/Components/TimeoutComponentTests.swift	83.44%	25 Missing ⚠️
...ts/Component/Components/RepeatComponentTests.swift	89.07%	20 Missing ⚠️
...tures/Component/Components/VelocityComponent.swift	68.00%	16 Missing ⚠️
...Component/Components/ThresholdComponentTests.swift	81.17%	16 Missing ⚠️
...sturesTests/Component/Gate/DurationGateTests.swift	79.22%	16 Missing ⚠️
.../Component/Components/VelocityComponentTests.swift	83.52%	14 Missing ⚠️
...ts/Component/Components/ReduceComponentTests.swift	80.59%	13 Missing ⚠️
...s/Component/Gate/SeparationDistanceGateTests.swift	80.95%	12 Missing ⚠️
...sTests/Component/Components/EventSourceTests.swift	91.80%	10 Missing ⚠️
... and 7 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #19      +/-   ##
==========================================
+ Coverage   74.34%   80.00%   +5.66%     
==========================================
  Files          84      109      +25     
  Lines        2651     4287    +1636     
==========================================
+ Hits         1971     3430    +1459     
- Misses        680      857     +177     

Flag	Coverage Δ
ios	73.03% <95.00%> (+6.28%)	⬆️
macos	80.15% <88.04%> (+5.58%)	⬆️

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