fix(agent-ui): keep chat open for status

Agent Status replaced the chat route and unmounted its EventSource. Any response still in flight could then disappear from the conversation.\n\nOpen status in a separate tab so the chat keeps its live connection until the response completes.\n\nAssisted-by: Codex:gpt-5 [eslint]

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
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Internal Server Error - Gitea: Git with a cup of tea
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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f