BoltAI v2.6.0

• New: Google Vertex AI. Configure service account JSON, project, and location to use Vertex models.
• New: Chat export/import. Export a chat to JSON or import it from the app menu.
• Improved: Tool history reliability. Anthropic server tools are sanitized to avoid malformed replay.
• Improved: Usage reporting. OpenAI‑compatible providers now surface usage metrics consistently.
• Fixed: Gemini image follow‑ups. Thought signatures are preserved and images are normalized for multi‑turn use.
• Fixed: Native tool availability. Provider-native tools now show up correctly (including new Vertex tools), with tool selection remaining per-chat.