Tooling pass: TS5, Sentry 8, ESLint 8, Husky 9, Prettier 3, small bumps

[ankit0504]

Summary

Phase 7 of the dependency-upgrade series — the tooling/hygiene pass. Stacks on #311 (phase 6) — please merge that one first; the diff here will include phase-6 commits until it lands.

• TypeScript 4.9 → 5 (clean, no code changes)
• Sentry 5 → 8 (Severity enum gone, ErrorBoundary types fixed)
• Husky 4 → 9 (config moved to .husky/)
• Prettier 2 → 3 (no formatting churn — codebase already conforms)
• lint-staged 10 → 15 (drop-in)
• ESLint 7 → 8 + airbnb v19 + @typescript-eslint v7 (kept airbnb-style rules; ESLint 9 + flat config is deferred)
• airtable 0.10 → 0.12, match-sorter 4 → 6, clsx 1 → 2, history minor (small drop-ins)

Why ESLint 8 instead of 9

ESLint 9 requires flat config, and eslint-config-airbnb-typescript hasn't shipped a flat-config-compatible release. Going to ESLint 9 cleanly means dropping airbnb and rewriting .eslintrc as eslint.config.js from scratch. That's a separate decision worth making deliberately rather than baking into a tooling-bumps PR.

ESLint 8.57 is the last 8.x release; it's in maintenance only. A future phase can do the flat-config migration with whichever ruleset replaces airbnb (the standard recommended presets, or @antfu's config, or a Biome migration).

Notable code changes

• Sentry's Severity enum was removed in v7+ — pass severity strings directly ('warning' instead of Sentry.Severity.Warning).
• The v6 @ts-ignore for Sentry's ErrorBoundary children prop is no longer needed; v8 types it correctly.
• Husky 9 dropped the package.json husky.hooks config; pre-commit now lives in .husky/pre-commit and re-installs via the prepare npm lifecycle.
• airtable@0.12+ types select().all() as Records<FieldSet> rather than Records<TResult>. airtableQuery is now a generic async function (TSX requires a function declaration to disambiguate the generic from JSX) that casts the result into { fields: TResult }[].
• match-sorter@6 removed its default export — now import { matchSorter, rankings } from 'match-sorter'.
• A handful of pre-existing lint issues that airbnb v19's stricter @typescript-eslint/no-redeclare, no-use-before-define, and no-unnecessary-type-constraint rules surfaced — all small reorganizations.
• Dropped eslint-plugin-flowtype (codebase has no Flow), eslint-plugin-jest (no Jest tests), prettier-eslint/prettier-eslint-cli (never invoked from scripts).

What's next

After this phase, the remaining items are mostly opportunistic:

• MUI v5 → v7 — @mui/styles was dropped in v6. Migrating means rewriting all 91 makeStyles/withStyles call sites to sx/styled(). Substantial enough to deserve its own phase.
• mapbox-gl v1 → v3 — Mapbox went paid-tier for SDK usage at v2. Needs a product/cost decision before bumping.
• react-markdown 5 → 9, react-router-dom 6 → 7, react-window 1 → 2 — medium-sized API rewrites; do as wanted.
• Testing Library suite — only matters if tests are revived.
• Abandoned helpers (filefy, webfontloader, jest-environment-jsdom-sixteen) — replace or delete.
• ESLint 9 + flat config — deferred from this PR. Pick a ruleset (recommended presets, antfu, or Biome) and rewrite the config.

Test plan

• App boots without console errors.
• Sentry init succeeds (no errors at app load).
• Search the omnibox — match-sorter still ranks results correctly.
• Make a change that fails lint, try to commit — .husky/pre-commit runs lint-staged and blocks the commit.
• yarn build produces a clean bundle.
• yarn lint is clean.