[Frontend] tsconfig.json — enable noUncheckedIndexedAccess and noUnusedLocals

[ogazboiz]

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Why this matters

frontend/tsconfig.json has \"strict\": true but is missing the safer-strict family that the backend tsconfig already enables:

Backend backend/tsconfig.json has:

\"noUncheckedIndexedAccess\": true,
\"exactOptionalPropertyTypes\": true,

Frontend has neither. The frontend has many obj[key] accesses (in localStorage parsing, stream maps, etc.) that silently assume the value exists. Turning on noUncheckedIndexedAccess is a great win for catching real bugs (e.g. fractionalPart.length on a possibly-undefined value in frontend/src/lib/amount.ts:98 — likely unreachable but no longer relies on luck).

noUnusedLocals would also surface the dead constant in frontend/src/lib/dashboard.ts:46 (filed separately) and any others.

Acceptance criteria

• Add noUncheckedIndexedAccess: true to frontend/tsconfig.json
• Add noUnusedLocals: true
• Fix or annotate the call sites the new check surfaces — expect 5-15 small changes
• npm run build passes
• Do NOT also add exactOptionalPropertyTypes in the same PR (too noisy; separate issue)

Files to touch

• frontend/tsconfig.json
• whichever frontend/src/** files the type-checker now complains about

Out of scope

• Enabling exactOptionalPropertyTypes (deferred to separate issue)

[RaymondAbiola]

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Hi, I’d like to work on this issue. I have experience with rust, Solidity, frontend, and backend development, and I’m confident I can deliver a clean solution.

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[oscar24357]

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hello maintainer, can you please assign this issue to me, i would like to work on it, thank you

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[shogun444]

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Hello Maintainer, I'm excited about this issue and would like to be assigned. I'll document my approach in the PR description so the team can follow my reasoning and suggest improvements early.

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[khanavi272-spec]

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I would like to work on this issue

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[Benedict315]

@Benedict315 has applied to work on this issue as part of the Stellar Wave Program's 5th wave.

please assign me

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