DS-043: Add a TokenPair and TokenAvatar primitive

[IbrahimIjai]

Complexity: Medium
Primary files: packages/ui/src/components/token-avatar.tsx, apps/web/src/shared/components/TokenIcon.tsx

Create reusable single-token and overlapping token-pair visuals with fallback
initials and accessible labeling.

Acceptance criteria

• Supports image, fallback initials, and two-token overlap.
• Sizes align with the icon/control scale.
• Decorative and meaningful usage are both supported accessibly.
• Existing TokenIcon call sites can migrate without visual regressions.

[devOgazi]

@devOgazi has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

Hello, I'm interested in resolving this issue.

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[collinsadi]

@collinsadi has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

I would like to work on this because I'm a senior software engineer with 4+ years of experience building scalable systems.

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Congratulations, @collinsadi! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox as part of the Official Campaign | FWC26 campaign!

@collinsadi's PR #438 was approved and merged by @IbrahimIjai.

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👏 Great work, @collinsadi! Keep contributing to SO4-Markets.

[drips-wave]

This issue has been completed by @collinsadi as part of the Stellar Wave Program's 7th Wave 🥳

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