Enable Biome's `organizeImports` with groups matching the original
ESLint `import/order` configuration:
1. **Node builtins** (`node:fs`, `path`, etc.)
2. *(blank line)*
3. **Third-party packages** (`express`, `@sentry/node`, etc.)
4. *(blank line)*
5. **Local/relative imports** (`../foo.js`, `./bar.js`, aliases)
This resolves the inconsistency where Biome wasn't enforcing import
grouping, meaning new files would lose the blank-line separation that
the old ESLint config enforced.
### Impact
- **354 files** updated out of 738 checked (~48%)
- **+188 / -240 lines** (net -52) — almost entirely single blank line
additions/removals between import groups
- No import reordering; purely group separator consistency
Fixes#7373🤖 Generated by LLM (Claude, via OpenClaw)
- vitest and all test types etc (test pass). Needed a few minor changes
to match new behaviour of `expect().toMatchSnapshot` (trailing
whitespace is now important)
- `which` - read the changes and spot-checked it. They dropped <v18
- `webpack-cli` - changes don't affect our usage. Checked with a local
`webpack` build and a "prod" run (`make` no dev)
- `enhanced-ms` - checked and updated to use new functionality
- `typescript` - all tests pass, no warnings.
Tested the site locally too.
