fix(writer): don't splice import type { as a Python simple import

[gjtorikian]

Summary

• isPythonSimpleImport matched the bare opener of a TS multi-line import type { … } block, splicing a stranded import type { line into regenerated files and breaking TypeScript parsing.
• Tighten the detector to also exclude lines containing { or } — multi-line TS type imports are already covered by the dedicated TS collector.
• Added a regression test that asserts import type { is not spliced as a simple import when the existing file uses multi-line TS type imports.

Repro

When the existing file looks like:

import type { WorkOS } from '../workos';
import type {
  WebhookEndpoint,
} from './interfaces/webhook-endpoint.interface';
import { deserializeEvent } from '../common/serializers';

…and the emitter regenerates with a single-line type import, the second line (import type {) — having no from on its own line — was treated as a Python simple import like import json, and spliceExtraImports injected it verbatim into the output as an orphan.

Test plan

• npm test (1422/1422)
• npm run typecheck
• npm run lint
• Verified end-to-end: regenerated workos-node no longer produces an orphan import type { in src/webhooks/webhooks.ts.

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