[feat]: Workspace folders with collapsible hierarchy #461
Description
Feature Summary
Organize workspaces/tasks into parent folders that can be expanded/collapsed in the left sidebar, with an optional main view showing all folders.
Problem or Use Case
Flat lists make it hard to manage many worktrees/tasks; users can’t group related work or quickly focus on a subset.
Proposed Solution
Add folder entities for grouping workspaces/tasks; left sidebar supports nested folders with expand/collapse, drag/drop reordering, and move-to-folder actions; provide a “Folders” view/
state to browse all folders, create/edit/delete them, and filter by folder; persist structure per user/workspace.
Alternatives Considered
Prefix naming conventions or tags; external file system folders; manual sorting.
Additional Context
Consider keyboard shortcuts for creating/moving items, and visual cues to distinguish folders vs tasks/workspaces; ensure folder state syncs across sessions.
Users reported having a hard time sorting their workspaces and remembering what was done in each workspace and if there is still work to be done