feat(ui): add the 104px avatar, group and presence sizes

[renefloor]

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Linear: FLU-797

Github Issue: #

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• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable)

Description of the pull request

The ringing call screens in stream-video-flutter are built on a 104px avatar, which no size named. This adds xxxl to StreamAvatarSize, StreamAvatarGroupSize and the presence/badge sizes that track them.

StreamAvatarGroup packs its children at 64px at that size — a diameter that sits between two named sizes — so the avatar gains an internal dimension override: the diameter comes from the group, while text, icon and border metrics keep coming from the size.

Tested by a widget test over StreamAvatarGroup at the new size.

Downstream

Adding a size is source-breaking for packages whose switches over these enums are exhaustive:

• stream-chat-flutter: fix(ui): keep compiling when the design system adds an avatar size stream-chat-flutter#2974
• stream-video-flutter pins this branch until it is released: feat(ui): redesign the incoming and outgoing ringing screens stream-video-flutter#1359

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[codecov]

Codecov Report

❌ Patch coverage is 90.32258% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 69.22%. Comparing base (04e0d1c) to head (6674525).

Files with missing lines	Patch %	Lines
...nts/avatar/internal/avatar_dimension_override.dart	66.66%	2 Missing ⚠️
.../src/components/badge/stream_online_indicator.dart	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #189      +/-   ##
==========================================
+ Coverage   69.18%   69.22%   +0.04%     
==========================================
  Files         214      215       +1     
  Lines        8845     8863      +18     
==========================================
+ Hits         6119     6135      +16     
- Misses       2726     2728       +2     

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