Chat stability · safer signup · smoother previews

Chat and task flow
- Fixed relay follow-up handling so rapid follow-on messages keep moving instead of leaving a generation stuck.
- You can now use slash skill commands more smoothly, with reactive menu updates and clearer mode-specific composer hints.
- Fixed CJK skill names so slash commands keep their visible names instead of collapsing to blank entries.
Generated previews
- Generated artifact images now open in the same shared lightbox as message images, with consistent browsing.
Account safety
- Signup now has stronger protection against scripted registration, including localized rate-limit feedback.
Website and transparency
- Logged-in visitors who land on https://kollab.im are now recovered into the product more reliably.
- The 404 page is cleaner, and the open-source attribution page (https://kollab.im/open-source) now lists bundled dependencies more completely.