## Summary
Increase the iOS message and reaction hold delay from 200 ms to 500 ms,
giving users more time to start scrolling without opening a menu.
Movement detection and other platforms remain unchanged.
Apple documents a [0.5-second default for
UILongPressGestureRecognizer](https://developer.apple.com/documentation/uikit/uilongpressgesturerecognizer/minimumpressduration).
### Related issue
Fixes#8500.
### Testing
- Regression checks fail with the old timeout and pass with the change:
no recognition at 499 ms, recognition by 501 ms, and scrolling after a
300 ms pause cancels the hold.
- Device testing pending; the local iOS simulator SDK is unavailable.
Before review, verify deliberate holds, slow scroll starts, and reaction
holds on an iPhone.
🤖 Generated with Goose
Signed-off-by: Matt Wilcox <mwilcox@squareup.com>
Co-authored-by: Gen <8a28d770b293a0b223e7c671e5985a35fd9bc1a3c7e3fa92ff715bd2fe61b253@squarewebplatform.communities.buzz.xyz>
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