Visualz 3.0.1

First hotfix after the v3 launch. Tightens the AI generation pipeline and the website surface that talks to it.

Fixes

• AI jobs — completed generations now persist their result, so a refresh no longer loses anything mid-flight and history replays cleanly.
• Sign-in — sign-in and sign-up flows hardened against stale sessions.
• Website — typed responses, smarter retries, and clearer error messages across every action that talks to the server.
• Fixed an off-by-one on slot focus after dropping a clip onto the canvas.