fix(agent): hide chat overlays until agent is ready

[moonrailgun]

Summary by CodeRabbit

• Bug Fixes
  • Empty-state guidance and page chips now appear only after the chat view is ready, preventing them from showing alongside the “No agent set” placeholder.
  • Added coverage to verify these elements are hidden before the chat view is mounted and visible afterward.

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Reviewing files that changed from the base of the PR and between 6777f3a and 22917bc.

📒 Files selected for processing (2)

• src/dao/browser/ui/webui/resources/agent/__tests__/dao_chat_view.test.ts
• src/dao/browser/ui/webui/resources/agent/dao_chat_view.ts

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