fix: context menu scrollability

[isekovanic]

🎯 Goal

This PR adds scrollability to our context menu whenever the space all of the items take up is larger than the current vertical size of the screen.

When he top item + message + bottom item don't fit the usable area, the message becomes scrollable between a pinned reaction picker (top) and a sticky action list (bottom):

• A Pan gesture drives a scrollY shared value (clamped to the overflow amount), with withDecay momentum on release
• No clipping so the message renders behind the opaque top/bottom items, so overflow passes behind them instead of being cut off
• On close, the scroll offset is folded into the close animation so the message animates back from wherever it was scrolled (no snap/rewind), then resets once fully closed.

🛠 Implementation details

🎨 UI Changes

iOS

Before	After

Android

Before	After

🧪 Testing

☑️ Checklist

• I have signed the Stream CLA (required)
• PR targets the develop branch
• Documentation is updated
• New code is tested in main example apps, including all possible scenarios
  • SampleApp iOS and Android
  • Expo iOS and Android

[Stream-SDK-Bot]

SDK Size

title	develop	branch	diff	status
js_bundle_size	1976 KB	1977 KB	+1026 B	🔴

[stream-ci-bot]

🎉 This PR is included in version 9.6.1 🎉

The release is available on:

• v9.6.1
• GitHub release

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