willchen96 folds the production build back into the open Mike repo

This isn't a feature launch so much as honesty maintenance: willchen96 pulling a batch of recent backend and interface work into the open-source repo so the public version matches the deployed one. The reliability wins are the headline. Word-to-PDF document conversion now actually works once the app is deployed, not just on a developer's laptop, and the AI layer behaves better under stress - it fails loudly and clearly when an API key is missing, and quietly retries when a model provider is overloaded or rate-limiting, instead of silently dropping the job.

On the surface users touch, documents can now be renamed inside projects, the project workspace has been rebuilt into cleaner pieces with better loading and error states, and the file-name column stretches to use the room on larger screens.