More models in the picker

The model picker keeps growing. Recent additions include GLM 5.2 Fast, DeepSeek V4 Pro, Kimi K2.7 Code, Gemma 4, Gemini 3.5 Flash, and Claude Opus 4.8.

Every model here is enhanced with a real workspace, tools, and memory, so it outperforms the native experience. Extra models also show short descriptions and brand icons, so choosing one is faster.