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>

AGENTS.md

@@ -52,7 +52,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - `occlude()` blocks the pointer for everything painted before it, its own ancestors too. Put it on the outermost box that should stop the pointer, as the toast stack does, or the ancestors' hover never fires.
 - A drag that pans, turns or slides goes through gpui's drag, whose moves reach the owner in or out of its box; `on_mouse_move` stops at the box's edge. gpui sends a drag's moves to every listener of its type, so each payload carries its owner's `EntityId` and handlers check it.
 - gpui 0.2.2 paints pictures without a transform, so a picture turns by its pixels: `media::turn` turns decoded frames by quarter turns off the main thread, an asset keyed by the picture and the turn.
-- A component that takes a starting value from its owner keeps it in `layout::seeded`: a new value from the owner replaces local drags. A field that reports its words as they change keeps what it sent, so the owner's echo leaves the caret alone (`mail::SignatureEditor`).
+- A component that takes a starting value from its owner keeps it in `layout::seeded`: a new value from the owner replaces local drags. A field that reports its words as they change keeps what it sent, so the owner's echo leaves the caret alone (`mail::SignatureEditor`). A cursor inside a seeded view stays while it lies in what is shown, so the owner's echo of a turn leaves it (`calendar::CalendarMonthView`, `YearView`).
 - The capture harness turns on reduced motion, so shots are still: repeating motion rests on one frame, and a shimmer shows no band. gpui's mac window stops its display link while occluded, so a capture advances a moving picture only on the draws the harness forces.
 - Each capture pass starts its page fresh (`Gallery::fresh`): page state lives under the pass, so the dark pass runs its script from the same start as the light one.
 - The capture harness finds gpui windows by handle through `raw-window-handle`. AppKit popups, which gpui does not own, come from the window list by process and level.
@@ -136,6 +136,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - A chat holds at its newest message through gpui's `list` with `ListAlignment::Bottom`: it sticks while scrolled to the end, and `scroll_to` one past the last item sticks it again; that call sends no scroll event, so the owner clears its own away state (`chat::MessageList`).
 - Anything pressable is a Tab stop: a row, card or toggle takes `tab_index(0)` and `focus_ring`, with a 1px border that stays transparent where it shows none; gpui presses it on the release of Enter or Space.
 - A list of pressable rows goes through `lists::SelectableList`, whose cursor reaches them by key: Up and Down move, Enter or a double press activates (`media::Playlist`). A bare `ListItem` press is the pointer's only. Titled sections of such lists go through `lists::Sections`, for ChannelList, MemberList and MailboxList; each owner builds its rows and keeps its own checks.
+- Columns that must line up across rows sit absolutely at fractions of their row, as the bars over them do (`calendar::CalendarMonthView`): with real text, gpui 0.2.2 lets a `flex_1` cell's text widen it, and the test platform's fixed advances hide it.
 - A row that holds text beside fixed parts lets the text give way: the text takes `flex_1().min_w_0()` and an `Ellipsis`; counts, icons, dates and chevrons take `flex_none`. A label that must stay whole wraps in that block instead, as `forms::Checkbox`'s does.
 - A mark over a text field reads the field at paint time, from a canvas laid over it (`collab::RemoteCursor`): by then `TextInput::bounds_for` holds this frame's layout, and a still page never renders again to catch up.
 - A callback field holds a named `type` alias; clippy's type_complexity rejects `Option<Rc<dyn Fn(..)>>`. A chapter shares one alias per shape.