test(components): add Vitest unit tests for GroupCard, ContributionFo…

[kimanicode]

Summary

Implements Vitest + React Testing Library unit tests for GroupCard, ContributionFlow, and TransactionHistory. 90 tests across 3 suites, all passing, with enforced coverage thresholds of ≥80% lines/functions and ≥70% branches.

Motivation

No frontend component tests existed for the three major UI components. This adds a reliable, fast test suite that mocks all external dependencies (Soroban RPC, Horizon, wallet hooks) so component logic can be verified in isolation.

Closes #876

Type of change

• feat — new feature
• fix — bug fix
• docs — documentation only
• refactor — code restructuring, no behaviour change
• test — tests only
• chore — build, deps, tooling
• perf — performance improvement
• Breaking change (existing behaviour changes)

Changes

• frontend/src/test/GroupCard.test.tsx — 39 tests: static mode (all original tests preserved), fetch mode (loading/error/success via React Query), edge cases (description, image, className, status variants)
• frontend/src/test/ContributionFlow.test.tsx — 35 tests: initial state, validation, quick-select chips, confirmation dialog, success flow, error/retry, disabled state, custom min/max, onError callback
• frontend/src/test/TransactionHistory.test.tsx — 16 tests: no-wallet state, type filter, Horizon fetch success/error/empty, custom address/contractId/pageSize/network
• frontend/vitest.config.ts — added coverage thresholds and ESM aliases for @creit.tech/stellar-wallets-kit/modules/*

Note: ContributionForm does not exist in this codebase — tests target ContributionFlow.tsx as the functional equivalent.

Testing

Smart contract:

cargo test -p stellar-save

Frontend:

cd frontend && npm run test

Coverage report:

cd frontend && npx vitest run --coverage

Expected: ≥80% lines, ≥80% functions, ≥70% branches across all three components.

Manual steps:

1. All 90 tests pass with no failures
2. Coverage thresholds enforced in vitest.config.ts — CI will fail if they regress

Checklist

• cargo fmt run (Rust changes)
• cargo clippy -- -D warnings passes (Rust changes)
• npm run lint passes (frontend changes)
• Tests added or updated for new/changed behaviour
• CI is green
• Documentation updated (if behaviour changed)
• No secrets or .env files staged

Screenshots / recordings

N/A — test-only change, no UI modifications.

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