Rulith Inference 0.3.7: Add documents works right after the update

Rulith Inference 0.3.7 fixes "Add documents or files" staying grey after the update from Strix Llama 0.3.5.

Documents without waiting for the model. Jan offers "Add documents or files" only to a model marked as able to use tools. 0.3.6 marked the model when it finished loading, but the model an earlier version had saved carried no mark, so after the update the menu item stayed grey, and dropped files were ignored, until a model had loaded. A document goes into the message as text, which needs nothing of the model, so the menu item and dropping files now always work; the model is also marked as soon as the app starts, which shows web search right away too.

Everything else is 0.3.6: the same model runtime, byte for byte.