[Backend] tsconfig.json — enable commented-out noImplicitReturns / noUnusedLocals / noUnusedParameters

[ogazboiz]

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Why this matters

backend/tsconfig.json lists several stricter checks but has them commented out:

// "noImplicitReturns": true,
// "noImplicitOverride": true,
// "noUnusedLocals": true,
// "noUnusedParameters": true,
// "noFallthroughCasesInSwitch": true,
// "noPropertyAccessFromIndexSignature": true,

The team clearly considered them. Enabling at least noImplicitReturns, noUnusedLocals, and noFallthroughCasesInSwitch is cheap and would catch real backend regressions (e.g. controller paths that don't return, dead vars in claimable.service.ts already partially flagged by #547).

Acceptance criteria

• Uncomment noImplicitReturns, noUnusedLocals, noFallthroughCasesInSwitch
• Resolve compile errors the checker surfaces (annotate _var for params we genuinely don't want, or delete dead code)
• npm run build and npm test pass

Optional in the same PR (or follow-up):

• noUnusedParameters
• noPropertyAccessFromIndexSignature

Files to touch

• backend/tsconfig.json

Out of scope

• Frontend tsconfig (separate issue)

[coderolisa]

@coderolisa has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Hello maintainer let me work on this
please assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @coderolisa to this issue.

[MerlinTheWhiz]

@MerlinTheWhiz has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

Let me handle this. Please assign

ℹ️ Repo Maintainers: To accept this application, review their application or assign @MerlinTheWhiz to this issue.

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