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build(deps-dev): migrate frontend lint to oxlint, unblock TypeScript 7 (#183)

TypeScript 7 (#174) could not be adopted because no released typescript-eslint
(incl. canary) supports TS >= 6.1 — its parser crashes on load under TS 7, which
took down the whole "Frontend Lint + Type Check" CI job.

Replace eslint + typescript-eslint with oxlint, which bundles its own parser and
is TypeScript-version-agnostic, then bump typescript 5.9.3 -> 7.0.2.

- Remove eslint, @eslint/js, typescript-eslint, eslint-plugin-react-hooks,
  eslint-plugin-react-refresh, globals; delete eslint.config.js.
- Add oxlint + .oxlintrc.json preserving the prior rule set: correctness
  category as error, plus react/rules-of-hooks (error),
  react/only-export-components (error, allowConstantExport),
  react/exhaustive-deps (warn). dist ignored.
- `npm run lint` now runs oxlint; CI job is unchanged (still `npm run lint`).

Verified locally: oxlint clean, `tsc -b` on 7.0.2 clean, `vite build` ok,
623/623 vitest tests pass. rules-of-hooks parity confirmed (conditional-hook
probe errors as before).

Closes #174.


Claude-Session: https://claude.ai/code/session_01UbV9wWrrn3xktDvaux7525

Co-authored-by: Claude <noreply@anthropic.com>

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