Staging

[zfoong]

`## What and Why
Hot fix for Anthropic model returning error issue

`Items changes/features added

• Fix the old Anthropic model output mismatch issue
• Updated model error display in browser interface
• Updated embedded credential for external apps
• Add hard-onboarding testing of LLM model

Test

Checklist

• Installation pass locally
• Tests create task and conversation happy path
• Test Anthropic model sonnet 4.6
• Test Anthropic model sonnet 3

[23008421]

Objectives:

• Fresh installation pass
• Test incorrect API key handling
• 2 happy path tests: conversation mode and task creation
• Test Anthropic models (sonnet 4.6 and sonnet 3)

PR Review Results:

• Fresh install passed, no errors
• Tested incorrect API key handling, able to verify and handle errors
• Test 1 (Sonnet 4.6): Agent is able to converse normally without creating tasks, able to create tasks if required (e.g. web search task), no errors, test passed.
• Test 2 (Sonnet 3): Unable to connect to LLM, Error: "An error occurred with the AI service. Please check your LLM configuration.", test failed.