Problem: Categories where every task is done still render in the buffer,
cluttering the view when entire categories are finished.
Solution: Add `view.category.hide_done_categories` (boolean, default
false). When enabled, `category_view()` skips categories whose tasks are
all done/deleted, returns their IDs as `done_cat_hidden_ids`, and
`_on_write` merges those IDs into `hidden_ids` passed to `diff.apply()`
so hidden tasks are not mistakenly deleted on `:w`.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Barrett Ruth
8d7759b6c4