docs(ios): performGesture idleTimeout guardrail + swipe/mouseClick rationale #2456

Job	Run time
Unit Tests	51s
Typecheck	24s
iOS Runner Swift Compatibility	5s
Integration Tests	1m 7s
Coverage	1m 11s
Fallow Code Quality	25s
No test-only DI seams	4s
	4m 7s

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