fix: Improve error handling in generateFromDefaultEndpoint

[calycekr]

• Refactor error handling in the generateFromDefaultEndpoint function to prevent the Node.js process from crashing when an AbortError occurs.
• Wrapped the getEndpoint and endpoint calls within a try...catch block to ensure that exceptions are caught and the process remains stable.

Error Log

AbortError: This operation was aborted
    at node:internal/deps/undici/undici:13510:13
    at process.processTicksAndRejections (node:internal/process/task_queues:105:5)
    at async file:///app/build/server/chunks/models-BZWchM1f.js:9918:17
    at async generateFromDefaultEndpoint (file:///app/build/server/chunks/_server.ts-DQzfZKIq.js:380:23)\n    at async getReturnFromGenerator (file:///app/build/server/chunks/_server.ts-DQzfZKIq.js:405:14)
    at async generateTitle (file:///app/build/server/chunks/_server.ts-DQzfZKIq.js:2022:10)
    at async generateTitleForConversation (file:///app/build/server/chunks/_server.ts-DQzfZKIq.js:1978:19)

[nsarrazin]

Thank you! Indeed it makes more sense like this.