[TypeScript Strict] Wave 1.3: Fix TypeScript errors in GraphQL and CodeGen

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[TypeScript Strict] Wave 1.3: Fix TypeScript errors in GraphQL and CodeGen

Epic: #21694

Scope: graphql/** Baseline: 5 errors across 2 files

Prerequisites

• Preceding wave / dependency issues merged to master
• Latest master branch pulled

Acceptance Criteria

• All TypeScript strict errors in scope fixed
• No new any types introduced
• No @ts-ignore comments (@ts-expect-error permitted only with linked tracking issue)
• No non-null assertions (!) for null safety — use defensive runtime checks
• Commits signed with git commit -s

Verification Command

cd ui
# Add graphql/**/*.ts and graphql/**/*.tsx to tsconfig.strict.json include, then:
./node_modules/.bin/tsc -p tsconfig.strict.json --noEmit

Error Breakdown

Affected Files

• graphql/lib/data-fetch.ts (3 errors - TS2322)
• graphql/lib/relayEnvironment.ts (2 errors - TS2345)

Error Details

File: graphql/lib/data-fetch.ts

• Line 12: Type 'string' is not assignable to type 'string & Location'
• Line 37: Type 'string' is not assignable to type 'string & Location'
• Line 45: Type 'string' is not assignable to type 'string & Location'

File: graphql/lib/relayEnvironment.ts

• Line 36: Argument type mismatch - Promise not assignable to ObservableFromValue
• Line 44: Argument type mismatch - Promise not assignable to ObservableFromValue

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