The weekday gutter drew 一/三/五 on rows 1/3/5 while the grid was
Monday-first, so every caption named the row below its day - today's
Thursday cell read as Wednesday. Rows now start on Sunday (row 0 =
Sunday): days.ts renames mondayOfWeek to sundayOfWeek and anchors on
getDay() directly, the grid builds off that anchor, and the labels key
by the row index they name so no row arithmetic can shift them again.
The month gutter is untouched - the label still marks the column
containing the month's 1st, now read off the column's Saturday. Specs
re-derive every pinned date from the Sunday-first calendar.
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