Copyosity 0.9.3 — model picker fix

Fixes model selection in the palette. The model dropdown sits in the drag area of the top bar, and the window-drag handler was intercepting clicks on it (preventDefault) so it never opened. Now interactive controls are skipped. Also hides non-chat models (embeddings/rerankers) from the picker.

Cumulative with 0.9.2 (agent chat CSP fix), 0.9.1 (auto-update relaunch), 0.9.0 (agent chat). Requires Settings → Hub enabled + token.