fix: load dotenv inside figma-sync main to avoid top-level await

[raskara-LD]

Summary

• tsx compiles packages/icons/scripts/figma-sync.ts as CommonJS (the icons package has no "type": "module"), which cannot emit top-level await.
• After refactor: fix oxlint findings instead of suppressing them #1976, optional dotenv loading used await import('dotenv') at module scope, so @launchpad-ui/icons:sync failed in CI with Top-level await is currently not supported with the "cjs" output format.
• Load dotenv inside an async helper awaited from main() instead of using top-level await.

Screenshots (if appropriate):

N/A

Testing approaches

DRY_RUN=1 pnpm nx run @launchpad-ui/icons:sync shows Missing FIGMA_ACCESS_TOKEN and did not fail during compile time anymore.

---

Note

Overview
Fixes @launchpad-ui/icons:sync failing under tsx when optional dotenv loading used top-level await, which CommonJS output cannot emit for this package.

Optional .env loading is moved into loadOptionalDotenv(), awaited from main() before reading FIGMA_ACCESS_TOKEN, DRY_RUN, and FORCE_SYNC. Token validation and process.exit(1) run after dotenv so local env files still apply.

Adds an empty changeset stub (.changeset/some-nights-film.md).

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[changeset-bot]

🦋 Changeset detected

Latest commit: 6c5433e

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

This PR includes changesets to release 0 packages

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[pkg-pr-new]

yarn add https://pkg.pr.new/@launchpad-ui/components@2016.tgz

yarn add https://pkg.pr.new/@launchpad-ui/icons@2016.tgz

yarn add https://pkg.pr.new/@launchpad-ui/tokens@2016.tgz

commit: 6c5433e