chore(extension): auto-format generated JS during extension build

[janitrbob]

Summary

• format generated extension JS files at the end of pnpm extension:build
• keep generated outputs in the same style expected by repo checks
• reduce local merge/pull conflicts on generated files after running build

What Changed

• extension/scripts/build.mjs
  • added Prettier API pass over generated output files after esbuild completes
  • kept runtime asset staging behavior unchanged
  • updated missing-runtime hint to pnpm wording

Why

Running only build could leave generated files in a style that differs from the repository's formatting checks. This made pull/rebase more likely to hit avoidable generated-file conflicts.

With this change, pnpm extension:build produces pull-friendly generated outputs by default.

Validation

• pnpm extension:build
• pnpm run format:check

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