Lint fixes: apply ESLint/Prettier auto-fixes

[dd32]

Summary

• Ran wp-scripts lint-js --fix on all JS sources, resolving 42 of 57 lint issues (Prettier formatting, missing curly braces).
• Merged duplicate @wordpress/editor imports in MultiAuthorPlugin.js.
• 14 issues remain — they require non-trivial structural decisions (experimental WP APIs, JSDoc types, browser globals) and are out of scope for an automated lint-fix pass.

Test plan

• npx wp-scripts test-unit-js — 9/9 tests pass
• npx wp-scripts lint-style — clean
• npx wp-scripts lint-js — 14 errors remain (down from 57), all require manual judgement

🤖 Generated with Claude Code

[dd32]

Iteration-2 verification: the duplicate @wordpress/editor imports flagged in review have already been merged on this branch. src/components/MultiAuthorPlugin.js lines 2-5 now contain a single combined import for both PluginDocumentSettingPanel and store as editorStore. The reviewer may have inspected trunk (where the duplicates remain) rather than the PR head lint-fix/auto-fixes.

Re-ran npm run lint:js on the branch: 14 remaining errors are all structural (@wordpress/no-unsafe-wp-apis on experimental HStack/VStack, missing JSDoc @param types, missing translator comments, no-undef for navigator). Per plan scope these are deliberately left for human review and not auto-fixable.

No code changes pushed in this iteration; the fix is already in commit ce7eb14.

Nightshift-Task: lint-fix
Nightshift-Ref: https://github.com/marcus/nightshift