feat: add @wxt-dev/entrypoint-refs package

[silverfish2525]

Summary

• add @wxt-dev/entrypoint-refs package — generates typed bundle-path constants for every entrypoint
• new optional ref?: string on BaseEntrypointOptions — stable identifier that survives file renames
• alias #entrypoints registered automatically when the module is set up
• all entrypoint types included (HTML pages, content scripts, background, etc.)
• content scripts with a CSS sibling get a companion _CSS constant automatically
• collisions disambiguated with a numeric suffix; skipped entrypoints excluded

// content.ts
export default defineContentScript({ ref: 'overlay', ... })

// background.ts
import { ENTRYPOINT_OVERLAY, ENTRYPOINT_OVERLAY_CSS } from '#entrypoints';
browser.scripting.registerContentScripts([{
  id: 'overlay',
  js: [ENTRYPOINT_OVERLAY],
  css: [ENTRYPOINT_OVERLAY_CSS],
  matches: ['<all_urls>'],
}]);

Tests

• bun run --filter @wxt-dev/entrypoint-refs test run
• bun run --filter @wxt-dev/entrypoint-refs check
• bun run check

Closes #2040

Depends on #2463 landing first (getEntrypointBundlePath export).

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