High level "Project" collaboration

i think we would use something like this if it existed (we’re currently all in Linear, but it’s overkill)
- “projects" as groups of tasks/notes/events (?) - probably collections with start/end date or something would enough
- project updates, marked on a shared calendar (combo linear project updates/linear milestone markers)
- project milestones (nice to have)
- gannt view (nice to have), ideally more easily shareable than linear’s