Migrate `useBounties` and `useInfiniteBounties` hooks to GraphQL

[0xdevcollins]

Depends on: #100

Migrate the paginated bounty list hooks from REST to GraphQL.

Files to modify

• hooks/use-bounties.ts — use useBountiesQuery from generated hooks
• hooks/use-infinite-bounties.ts — adapt to GraphQL's PaginatedBounties response shape (bounties[], total, limit, offset) instead of the current PaginatedResponse<Bounty> shape (data[], pagination)
• hooks/use-bounty-search.ts — use the bounties query with search variable

Tasks

• Replace bountiesApi.list(params) with the codegen useBountiesQuery({ query: params })
• Map the PaginatedBounties response ({ bounties, total, limit, offset }) to what the UI expects
• Update useInfiniteBounties to use useInfiniteQuery with the GraphQL bounties query, paginating via the page variable
• Update useBountySearch to use the GraphQL bounties query with { search } filter
• Verify the discover page and home page still render bounty lists correctly

Acceptance Criteria

• Bounty list, infinite scroll, and search all use GraphQL
• No REST calls remain for listing bounties

[linear]

BOU-94

[coderabbitai]

🔗 Related PRs

#30 - feat: Implement React Query hooks for managing bounties [merged]
#34 - feat: Implement API-driven bounty fetching and display with dedicated loading, empty, and error UI components. [merged]
#45 - Ekene001/bou 59 setup graphql client code generation [merged]
#47 - Add comprehensive GraphQL schema for bounties and projects API [merged]
#88 - feat: Implement bounties detail page [merged]

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[Tola-byte]

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[od-hunter]

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Hi, can I be assigned this issue please? I've gone through the task to modify and task, and I'm up for the task. Kindly assign please.

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