feat(incentives): sync schema with V3 backend, add kind discriminator

[mgrabina]

Summary

Regenerates packages/graphql/schema.graphql against the V3 backend (localhost:3011) and reruns gql-tada generate output so graphql-env.d.ts matches.

Backend PR aave/aave-v3-backend#210 splits POINTS programs by Merkl campaign_id presence but in an additive way: same __typename (SupplyPointsIncentive / BorrowPointsIncentive), discriminated by a new kind: PointsProgramKind! field (CAMPAIGN | LOYALTY). For kind = LOYALTY, dailyPoints / pointsPerThousandUsd are always null.

Schema delta

• New: enum PointsProgramKind { CAMPAIGN LOYALTY }
• New field: kind: PointsProgramKind! on SupplyPointsIncentive and BorrowPointsIncentive
• Plus the accumulated delta since the last sync: extended Merit fields (actionKey, rewardTokenAddress, rewardTokenSymbol, customMessage, customForumLink, selfApr), Merkl + Points incentive types, canonical userRewards query, MeritSavingsGhoIncentive, RewardId scalar.

No removals — verified by diffing the schema SDL produced by backend main vs backend PR #210. Change is purely additive at the GraphQL schema level.

What this PR contains

• packages/graphql/schema.graphql + graphql-env.d.ts: regenerated against local backend on PR #210
• packages/graphql/src/fragments/reserve.ts: new fragments for Merkl/Points incentives, kind selected in points fragments, extended Merit fragments
• packages/graphql/src/fragments/incentives.ts: new file, MeritSavingsGhoIncentiveFragment
• packages/graphql/src/fragments/index.ts: export the new fragment
• packages/graphql/src/incentives.ts: userRewards + savingsGhoIncentive queries
• packages/graphql/src/graphql.ts: RewardId scalar mapping
• packages/client/src/actions/incentives.ts: client actions
• packages/react/src/incentives.ts: react hook
• packages/types/src/id.ts: RewardId branded type
• .changeset/incentives-kind-sync.md

Test plan

• pnpm install && pnpm -r build ✅
• pnpm lint ✅
• Re-run pnpm gql:download:local against a fresh backend on PR #210 → no further delta
• Consumers branching on __typename keep working unchanged (no new union variants)
• Consumers can opt into kind selection to differentiate loyalty vs campaign points

Linear: https://linear.app/aavelabs/issue/SDK-779

Closes SDK-779

[linear]

SDK-779 Centralize all incentive sources on V3 backend

[chatgpt-codex-connector]

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