[Refactor] Pay down TypeScript type-safety debt — 575 errors across 89 files (tsc --noEmit)

[seneka-DSNA]

Context

next.config.mjs ignores build type errors (ignoreBuildErrors: true), and nobody had
run tsc --noEmit in isolation until it was added to CI. That's why 575 errors across
89 files showed up all at once — pre-existing debt, not something new. The CI step is
currently non-blocking (continue-on-error: true) because of this backlog. Missing
imports (FormEvent, useEffect, etc.) are already being handled separately.

Priority 1 — Real bugs, not just missing types ✅ FIXED ✅

• DashboardClient.tsx:44-70 — calls setter functions (setData, setLoading, etc.)
  never destructured from useState. Throws at runtime if hit.
• datatable.tsx:349 — comparing a boolean to a string, can never be true.
• InvoiceTable.tsx:217, CropImage.tsx:28, TotalEarning.tsx:2 — broken component
  return type, wrong function signature, and a broken import path, respectively.
• .../untitled folder/Datatable.tsx:33 — imports a file that doesn't exist (this
  folder looks like dead/duplicate code — candidate for deletion, not fixing).

Priority 2 — Bulk type hygiene (~380 instances, low risk)

Mostly implicit any on parameters, and session.user.role/id not recognized because
next-auth's Session type was never extended to match the custom fields added in the
jwt/session callbacks (data is real at runtime, only the type declaration is
missing). Not worth fixing one-by-one — see approach below.

Suggested approach

1. Review and fix Priority 1 individually. DONE ✅
2. For Priority 2: add a types/next-auth.d.ts augmentation (fixes the role/id
   cluster in one shot), then either fix the rest incrementally or mark untouched
   legacy files // @ts-nocheck so new files stay strictly checked.
3. Once npm run typecheck is clean, remove continue-on-error from CI and
   ignoreBuildErrors from next.config.mjs.

Definition of done

npm run typecheck exits 0 (or remaining files are explicitly @ts-nocheck'd), and
CI's Type Check step is blocking again.

[mph7]

Priority 1 bugs have been fixed on the fix-typecheck-bugs branch:

While running a full project typecheck as part of this cleanup, additional broken import paths turned up beyond what was listed here — those were fixed in the same branch and commit.

All changes are on the PR #12 as a draft