ci(lint): enable lint in CI + fix existing lint debt (#2129)

CI was running build + typecheck + test, but never lint. The i18n
guardrail (eslint-plugin-i18next on packages/views/**/*.tsx) was
configured but not enforced, so PRs kept landing user-facing English
strings (chat session delete, project resources, mermaid fallback,
invitations batch page).

Changes:

- .github/workflows/ci.yml: add `lint` to the turbo command
- packages/eslint-config/react.js: split React rules (JSX-only) from
  react-hooks rules (apply to .ts too) — hooks live in .ts modules
  like use-agent-presence.ts, and inline-disable comments need the
  rule registered to resolve
- Translate the 10 lint errors that surfaced:
  - editor/readonly-content.tsx mermaid render-error + rendering
  - issues/issue-detail.tsx Archive tooltip
  - invitations/invitations-page.tsx full page (new invite.batch.*)
- invitations-page.test.tsx wrap with I18nProvider so getByRole queries
  match translated button labels
- core/auth/utils.ts intentional control-char regex: add eslint-disable

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.github/workflows/ci.yml

@@ -29,8 +29,8 @@ jobs:
       - name: Install dependencies
         run: pnpm install
 
-      - name: Build, type check, and test
-        run: pnpm exec turbo build typecheck test --filter='!@multica/docs'
+      - name: Build, type check, lint, and test
+        run: pnpm exec turbo build typecheck lint test --filter='!@multica/docs'
 
   backend:
     runs-on: ubuntu-latest