[Feature] Enhanced Collapsing and Expanding of Projects and Tasks

[rickyweb]

Summary: Improve the user experience in the GANTT view by refining the handling of collapsed and expanded states for projects and tasks.
Current Scenario: When opening the Global GANTT or the GANTT of a specific project, all subprojects and tasks are visible.
Proposed Changes:

1. Collapsed Default View:
   • Open the GANTT with all projects and tasks collapsed by default.
   • Enhances the user experience, particularly for those who prefer starting with a global overview before delving into specific subprojects.
2. Quick Toggle Button:
   • Add a toggle-button in the header to the left of Project / Task for swiftly collapsing or expanding all subprojects and tasks.
     
   • Improves usability by providing a convenient shortcut for managing project visibility.
3. Status Memory Feature:
   • Implement a feature to auto-save the latest expanded/collapsed status of a project.
   • Streamlines user interactions by preserving the preferred view when navigating between projects and the GANTT view.