Three layout improvements for better space utilization:
- Compact date headers: date labels render as left gutter column instead
of standalone lines, saving one line per date group in stream view
- Input drawer: capture bar expands to 4-line drawer with border, hints,
and live preview of parsed entity/search query
- Split-pane detail: wide terminals (>=100 cols) show list and detail
side-by-side with h/l focus switching, falling back to full-screen
detail on narrow terminals
Search uses existing parse grammar ?prefix — type `?query #tag` in
capture bar to filter entities client-side. Substring match on
body+title+description with AND tag filtering. Esc clears search.
Absorb via m key on fluid entities — opens source picker showing all
other entities, enter merges source into target. Uses existing
store.Absorb() backend.
Adds `nib tui` command and `make tui` target. Scrollable entity list
with j/k navigation, enter for detail view, `a` to capture new entries
using the existing parse grammar, and `d` to delete.
lerko