[feature]: Organize Projects by collapsible sections

Is there an existing issue for this? • I have searched the existing issues Summary This feature request proposes the implementation of collapsible sections or folders in the left-hand project sidebar. This would allow users, particularly those managing multiple projects, to group and organize their project list for improved navigation and accessibility. As our team and the number of concurrent projects grow, the flat list of projects in the left sidebar is becoming increasingly difficult to manage. Users like project managers and team leads, who often have access to 20 or more projects, face challenges in quickly locating the specific project they need. The current alphabetical or recent sorting is helpful, but it doesn't provide the contextual organization required for efficient workflow. This leads to wasted time scrolling and searching, increasing cognitive load and reducing overall productivity. For example, a manager trying to review all projects for a specific cl…