Calendar · Agenda and people: an agenda, an event's details, its guests

AgendaView lists the days ahead under their names, whole days first,
then by the hour, and leaves out days with nothing; it rides on
lists::Sections, so a press or an arrow selects and Enter opens. An
empty stretch says nothing is planned.

EventPopover is an event's chip that opens its details: its title in
its hue, when and where, who is asked, and Edit and Delete when the
owner handles them. It opens through Popover::with_opener, which now
hands any element the toggle and keeps focus, placement and every way
out in the popover. AttendeeList counts the answers and lists each
guest with their answer, the organizer first. A hue worn in a row is
now data_display::color_mark, for mail labels and events alike.

AGENTS.md

@@ -76,6 +76,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - gpui draws a window's first frame inside `open_window`. State the first frame reads, such as `cx.set_menus`, is set before it opens.
 - gpui clicks a focused element when Enter or Space is released. An overlay that hands focus back picks on release too; a pick on press returns focus first, and the release clicks the opener again. An edit in place that hands focus back keeps its text on Enter's release (`forms::InlineEdit`). The press itself bubbles, so a container that takes Space leaves a focused button its own: `overlays::media_button` stops it, and a button in a `SelectableList` row stops Space and Enter at its box (`mail::MailItem`'s star, `messaging::PinnedMessages`' Unpin).
 - A focus handle a component hands back lives across all its modes: take it with `tab_stop` before any early return, or keyed state drops it while the other mode draws and the handed-back focus lands nowhere. A thread's message keeps one handle folded and open, a Tab stop only while folded (`mail::MailThreadView`).
+- A panel that opens from something other than a button goes through `overlays::Popover::with_opener`, which hands the opener its toggle; focus, placement and every way out stay in the popover (`calendar::EventPopover`'s chip).
 - A dialog goes through `overlays::Dialog`: scrim, focus trap, Escape and focus return live there. Its close runs on every way out, so a dialog with two answers marks the chosen one before it closes (`messaging::IncomingCallDialog`). AlertDialog, ConfirmDialog and PromptDialog build on it; a fullscreen dialog fills the window below its title bar. A dialog's card fits the window, a title bar's height clear at each end; its body scrolls and its actions stay.
 - Controls on a dark layer over pictures are `overlays::media_button`, light icons that dim when they have nowhere to go, for the lightbox and a video player's bar alike.
 - A component's letter keys step aside while Command or Control is held, so the app's shortcuts reach the app (`media::ImageAnnotator`, `VideoPlayer`, `VideoThumbnailStrip`).
@@ -120,7 +121,7 @@ Ely GPUI Component. A component library for GPUI, in light and dark.
 - Paths with `/` between folders become a tree through `lists::Folder::of`, for `FileTree` and `files::ArchiveViewer` alike.
 - A folder's path over its entries is `lists::path_bar`, and its first order is `lists::listed`, folders first by name: DirectoryListing and FileExplorer share both, so every view shows one path and one order.
 - A file's icon comes from `primitives::file_icon`, one map from name to icon for every chapter; `files::FileIcon` draws it. What fits across a width comes from `layout::columns_for`, and `layout::fit` adds the inset that centers it.
-- Badges, tags and avatars live in `data_display`; forms and shell draw theirs from there, and `data_display` imports neither. Avatars take square pictures. A tag is never wider than its container; a long label ends in an ellipsis beside its remove mark.
+- Badges, tags and avatars live in `data_display`; forms and shell draw theirs from there, and `data_display` imports neither. A hue worn in a row, a label's or an event's, is `data_display::color_mark`, and `Palette::hue` gives the chart color by index. Avatars take square pictures. A tag is never wider than its container; a long label ends in an ellipsis beside its remove mark.
 - A picture drawn in code reaches gpui as a `RenderImage`. A host that replaces one frees the old through `App::drop_image`, or every frame stays in the sprite atlas (the gallery's model).
 - `img()` keeps loading state, and moves an animated picture's frames, only with an id. Content masks are rectangles, so rounded corners survive only when the image fills its box without cropping.
 - gpui reads a `&str` picture source as a web address. A file goes through `Path` (`documents::source` in the crate, `Path::new` in the gallery).