willchen96 syncs a quarter's worth of polish into the OSS Mike

A maintainer-merged batch that tightens deployment, sharing, and the Project Page - without adding a headline feature.

This isn't a feature drop. willchen96 used a single self-merged pull request to pull recent work from the upstream product back into the open-source repo, so anyone running their own copy gets the same fixes the hosted version has.

The deployment side gets DOCX-to-PDF conversion working in the cloud environment, and the Gemini integration - Google's AI model family - now fails loudly on a missing key and retries when the model is overloaded instead of dropping the request. Project sharing is reworked to match how the database actually stores collaborator lists, and document rename lands inside projects with a small fix so highlighting the name no longer triggers a drag. The Project Page itself is broken into smaller pieces covering the assistant and reviews tabs, with better loading and error states on the overview.