fix(ui): map xxl avatar to xxl online indicator size

[xsahil03x]

Summary

• Splits the _indicatorSizeForAvatarSize mapping in StreamUserAvatar so .xxl maps to the new StreamOnlineIndicatorSize.xxl (20px) instead of xl (16px).
• Bumps stream_core_flutter git ref to pick up the new size variant.

Fixes the online indicator dimensions on the xxl avatar (Contact Info screen) — per spec: 20px diameter, 2px inner border.

Depends on GetStream/stream-core-flutter#116 — the stream_core_flutter ref should be moved to main once that PR merges.

Test plan

• Verify the indicator renders at 20px diameter with a 2px inner border on StreamUserAvatar with StreamAvatarSize.xxl
• melos run analyze

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• Commit unit tests in branch fix/avatar-2xl-online-indicator

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[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (v10.0.0@d9b3105). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
.../lib/src/components/avatar/stream_user_avatar.dart	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             v10.0.0    #2711   +/-   ##
==========================================
  Coverage           ?   67.61%           
==========================================
  Files              ?      407           
  Lines              ?    24468           
  Branches           ?        0           
==========================================
  Hits               ?    16543           
  Misses             ?     7925           
  Partials           ?        0           

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