V10.5 Task A.3: Frontend — Tests for tool call rendering

[up-guillaume]

Description

Create tests for tool call rendering in frontend.

Tasks

• Unit test: render tool_call message
• Integration test: load history with tool calls
• E2E test: conversation with tool calls

Acceptance Criteria

• 3+ tests created and pass
• Coverage > 80%

Related

• Issues: Allow native group replies to mention humans without waking Runs #911, V10.5 Task A.1: Frontend — Render tool_call messages in ChatMessage #912 (dependencies)
• Plan: PLAN_V10_5.md