Set up Vitest component tests for frontend

[ogazboiz]

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Description

The frontend has no automated tests. The CI pipeline builds the app but never runs tests. Vitest is already available in the ecosystem — adding component tests would catch regressions early.

Test Cases Needed

• StreamCreationForm — validation errors shown for invalid inputs
• StreamCard — renders correct sender/recipient/amount/rate
• useStreamEvents hook — connects to SSE, updates on events, reconnects on disconnect
• amount.ts utilities — conversion and formatting functions
• Wallet context — connect/disconnect state transitions

Files

• frontend/src/__tests__/ (create)
• frontend/vitest.config.ts

Acceptance Criteria

• Tests run with npm test in frontend
• CI frontend job runs tests
• At least 60% coverage on utility functions

[suleimanjem-hash]

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[fathiaoyinloye]

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I am confident in my ability to handle the task and requirements for this issue and am eager to contribute to the codebase.

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This issue has been completed by @suleimanjem-hash as part of the Stellar Wave Program's 4th Wave 🥳

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