Groundwork for the month view style setting (#38, #53); no behaviour change.
- Split layoutCalendarWeek out of layoutMonthWeeks so the continuous style,
which streams weeks and has no enclosing YearMonth to slice by, lays rows
out identically. layoutMonthWeeks (also used by the month widget) keeps its
signature and becomes a loop over it.
- Add MonthUiState.Success.instancesByDay: the grid's events keyed by date and
uncapped, so the split style's day pane can list a date without a second
provider query — the month grid range already covers it.
- Move AgendaDayHeader / AgendaEmptyDayRow / AgendaEventRow and their label
helpers into AgendaRows.kt as internal, so the split pane reuses the agenda's
row vocabulary instead of growing a parallel one. AgendaEmptyDayRow takes its
text as a parameter now that it serves more than "nothing left today".
- Add the month package's first JVM tests, covering week counts, span
continuation across row boundaries, lane stacking and instancesByDay.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Jean-Luc Makiola
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