renatomen 052b945b49 docs: add comprehensive subgrouping feature documentation ...

- Document hierarchical subgrouping in filtering-and-views.md with demo GIF
- Add subgrouping section to task-list.md with usage examples
- Update agenda-view.md to reference subgrouping support
- Enhance features.md overview to mention two-level organization
- Include subgroups.gif demonstration of the feature in action

Provides complete documentation for the new hierarchical subgrouping
functionality that allows two-level task organization across views.

2025-09-18 11:16:31 +00:00

4.2 MiB

1058x639px

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