Add Zotpress citation conversion via Better BibTeX

[adaptiman]

Summary

• Adds pandoc-style citation conversion during publish, from [[@citekey]] to Zotpress shortcodes.
• Resolves citekeys to Zotero item references using Better BibTeX JSON-RPC.
• Supports both single and multiple inline citation output:
  • Single: [zotpressInText item="{libraryId:itemKey}"]
  • Multiple: [zotpressInText item="{libraryId:itemKey},{libraryId:itemKey}"]
• Appends bibliography block (HR + H1 + shortcode) when needed:

  ---

  • Bibliography

  • [zotpressInTextBib]
• Adds plugin settings and i18n strings for Zotpress and Better BibTeX configuration.
• Updates README with setup requirements, behavior, and configuration guidance.

Requirements

• WordPress Zotpress plugin installed and active.
• Zotero desktop running locally.
• Better BibTeX for Zotero installed and enabled.
• Reachable Better BibTeX JSON-RPC endpoint (default: http://localhost:23119/better-bibtex/json-rpc).

Behavior and Fallback

• If lookup succeeds, citekeys are converted to Zotpress tuples.
• If some citekeys cannot be resolved, unresolved citations are left unchanged.
• If Better BibTeX is unreachable, publish continues and warning notices are shown.

Validation

• npm run build
• Manual test: single citation conversion
• Manual test: multiple citation conversion
• Manual test: bibliography append block

Reviewer Checklist

• Single citation shortcode format is correct.
• Multiple citation shortcode format is correct.
• Bibliography block appends only when appropriate.
• Better BibTeX lookup failures do not block publish.
• README setup instructions are accurate.