test: add query key integration tests and placeholder hooks

[wagmiiii]

Summary

Closes #459

Adds the missing data-fetching hooks (as placeholders) and the requested integration test to guarantee query key consistency across the app.

What Changed

• Added useCreators.ts exporting useCreatorList and useCreatorDetail
• Added useWallet.ts exporting useWalletHoldings and useWalletActivity
• Added queryKeyIntegration.test.tsx to assert strict cache-key equivalence with queryKeys.ts

Key Design Decisions

• Missing Hooks: The hooks requested in the issue scope were missing from the codebase entirely. To fulfill the requirements of this integration test without inventing complex business logic, minimal placeholder hooks were created that strictly bind to the React Query constants.
• Testing Approach: Tests capture the query key directly from the QueryClient cache upon component render to guarantee the key generated internally matches the exported constant perfectly.

Acceptance Criteria Checklist

• Each hook's query key matches the corresponding constant
• Test fails if a hook is updated to use a different key without updating the constant

Test Output & Coverage

 ✓ src/hooks/__tests__/queryKeyIntegration.test.tsx (4 tests) 74ms
   ✓ queryKeyIntegration (4)
     ✓ useCreatorList uses the correct query key constant 61ms
     ✓ useCreatorDetail uses the correct query key constant 4ms
     ✓ useWalletHoldings uses the correct query key constant 3ms
     ✓ useWalletActivity uses the correct query key constant 2ms

-----------------|---------|----------|---------|---------|-------------------
File             | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
-----------------|---------|----------|---------|---------|-------------------
All files        |   92.85 |       50 |    92.3 |   92.85 |                   
 hooks           |     100 |      100 |     100 |     100 |                   
  useCreators.ts |     100 |      100 |     100 |     100 |                   
  useWallet.ts   |     100 |      100 |     100 |     100 |                   
-----------------|---------|----------|---------|---------|-------------------

Security Note

Placeholder hooks do not introduce new user inputs, network surface area, or hardcoded secrets.

Follow-Ups

• Replace the queryFn placeholder promises with real API logic when the endpoints are finalized.

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