Calendar · Months: a month view, a year view, event chips and cards

CalendarMonthView lays a month in week rows. An event across days lies
over them as a bar in the first free lane, cut at the week's edge;
the rest sit by the hour as chips, and a crowded day keeps the rest
behind "N more". Arrows move a day, Page keys turn the month, and
Enter or a double press opens the day; the cursor holds through the
owner's echo of a turn. Days sit at sevenths of their row, as the bars
do, so text never widens a column.

YearView shows twelve small months; a day with something on it wears a
dot in its first event's hue. EventChip is an event in a line and
EventCard a block with its hours and place. MiniCalendar points to
forms::Calendar. Palette::hue is now the one home for a chart color by
index, for mail labels and events alike.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/theme/mod.rs

@@ -1,3 +1,4 @@
+mod calendar;
 mod chart;
 mod files;
 mod generative;
@@ -11,6 +12,7 @@ use std::time::{Duration, Instant};
 use gpui::{App, Global, SharedString, WindowAppearance};
 
 use crate::motion;
+pub use calendar::CalendarSizes;
 pub use chart::ChartSizes;
 pub use files::FileSizes;
 pub use generative::GenerativeSizes;