feat: Persist workspace expansion state after page reload

[JKGeovision]

Hello,

I noticed that reloading the page resets all workspaces to their default collapsed state, so the UI forgets which workspaces I had expanded. It would be great if the expansion state of the workspaces were remembered across page reloads.

Acceptance criteria:

• The expanded/collapsed state of each workspace is persisted and restored after a page reload
• Workspaces that were expanded before the reload appear expanded after it
• Workspaces that were collapsed before the reload remain collapsed

Thanks for considering this!

Best regards,
Joshua Krimmer

[owui-terminator]

🔍 Related Issues Found

I found some existing issues that might be related. Please check if any of these are duplicates or contain helpful solutions:

1. 🟣 #134 Sidebar: workspace chat list not visible until clicking folder chevron
   This issue is about the same workspace expansion behavior in the sidebar. It reports that workspaces do not auto-expand when navigating or loading the workspace, which is closely related to persisting/restoring expanded state across reloads.
   by PhilippeRoy

2. 🟣 #230 Issue feat: Move workspace-independent chats to the sidebar for easier management #230
   This open feature request involves workspace/sidebar management in the same area of the UI. While it is broader and not specifically about expansion persistence, it may touch the same sidebar state handling and workspace presentation logic.
   by unknown

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💡 If your issue is a duplicate, please close it and add any additional details to the existing issue instead.

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