v0.preview.48

v0.preview.48 - 2026-07-01

• Add an orange grid style for the composer and sent user messages
• Automatically reconnect on transient mid-stream errors, with consolidated provider error parsing
• Rework the session into a self-driving actor with a fan-in mailbox, and fix follow-up turn-lifecycle regressions so exactly one end-of-turn event fires per turn
• Improve offline CUDA detection and local-server diagnostics
• Read the Zai provider API key from ZAI_API_KEY
• Fix a UTF-8 truncation bug in the ambient prompt