Fix Assets library chat toggle and sidebar image model chat controls

[teleaziz]

Summary

• Fix Library route SSR/embedded detection so /library renders the correct chromeless picker state before hydration.
• Keep the Library header and agent chat toggle available across normal Library pages.
• Add the Assets image model picker to sidebar chat by passing imageModelMenu through AgentSidebar.
• Share the Assets image model menu state between the Create page chat and sidebar chat.

Verification

• Ran core typecheck.
• Ran Assets typecheck.
• Ran Assets production build, including SSR/Nitro build.
• Verified with Playwright:
  • normal /library shows the chat toggle/header controls
  • embedded /library?embedded=1 renders chromeless picker UI
  • Create page chat and Library sidebar chat both show the Image model menu

[github-actions]

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[builder-io-integration]

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Error ID: 967412de6447473c9b91925a708d4141