fix: end route module ids in the source extension so unplugin filters match

[birkskyum]

• Closes [Bug?]: unplugin-icons + unplugin-auto-import don't work within filesystem routes #1374

Route files are requested with a ?pick=... query, leaving ids like src/routes/index.tsx?pick=default&pick=$css. That does not end in .tsx, so plugins filtering with an end-anchored extension regex (/\.[jt]sx?$/, the default in unplugin-auto-import and friends) silently skip every route file.

The query now ends with &lang.<ext>, the same convention @vitejs/plugin-vue uses for ?vue&type=script&lang.ts. The three places that built this string share a toRouteModuleId() helper.

That change moves the query into Rollup's chunk base name, so sanitizeRouteChunkName strips it back off via output.sanitizeFileName. Output filenames are unchanged from before this PR.

Verified with stock AutoImport({ dirs: [...] }) and no include override: the import is now injected into route chunks, in both build and dev. Existing suites pass (64 unit, 30 e2e, 30 bundled-dev), all fixtures build.

[changeset-bot]

🦋 Changeset detected

Latest commit: ccfd266

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@solidjs/start	Patch

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commit: ccfd266

[birkskyum]

Superseded by #2249, which landed the same fix on main: the same lang.<ext> marker on route module ids, plus the same chunk-name sanitizer to keep filenames unchanged. Its toPickId also guards on the script extensions, so .md/.mdx routes keep the old id shape, which is better than what this PR did.

That leaves nothing here but a changeset, which is now #2254.

#1374 (the unplugin-auto-import report this PR was aimed at) is fixed by #2249 for the same reason #1918 was.