feat(quickshell): dashboard drawer that drops from the bar

A drawer lowered out of the underside of the bar, painted in the hull
colour and joined to it by two concave fillets so it reads as more of the
hull rather than as a floating card — caelestia's dashboard idea, in the
YoRHa language. Four columns divided by hairlines: operator and clock, the
month with today as an inverted square, the system meters, and the active
player with a hairline timeline and square transport buttons.

Opened by clicking the bar's clock (which used to pin the calendar), by
SUPER+I, or by `qs ipc call shell dashboard`. Escape or moving focus away
closes it through a HyprlandFocusGrab; Actions.dashboardClosedAt keeps the
clock click that cleared the grab from reopening it. The clock's calendar
hover is suppressed while the drawer is down, since it shows the month.

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

quickshell/README.md

@@ -57,7 +57,7 @@ clear composition and stronger separation from the desktop. **Cinematic**
 it is never used as decoration inside ordinary chrome or popouts.
 
 ```
-shell.qml        entrypoint — bar, rail, power menu, toasts, OSD per screen
+shell.qml        entrypoint — hull, bar, rail, dashboard, power menu, toasts, OSD per screen
 config/          palette, type scale, geometry, motion curves
 components/      the primitives: panels, sliders, list rows, display text
 services/        data sources, all singletons
@@ -72,13 +72,24 @@ assets/          halftone and stripe tiles, generated with ImageMagick
 callers set implicit sizes from their own layout (`row.implicitWidth +
 contentPad * 2`), which keeps the shape maths out of binding loops.
 
+## Dashboard
+
+`dashboard/Dashboard.qml` is a drawer that slides down out of the underside of
+the bar — clock click, `SUPER + I`, or `qs ipc call shell dashboard`. It is
+painted in the hull colour and joins the bar through two concave fillets, so it
+reads as more of the hull rather than as a floating card (caelestia's idea).
+Four columns divided by hairlines: operator and time, the month, the system
+meters, and what is playing. Escape or focusing anything else puts it away; a
+`HyprlandFocusGrab` handles the latter, and `Actions.dashboardClosedAt` stops
+the clock click that cleared the grab from opening it straight back up.
+
 ## Modules
 
 | Module | Where | Left click | Right click | Middle | Scroll | Hover |
 |---|---|---|---|---|---|---|
 | Sigil | bar | app menu | reload shell | | | |
 | Workspaces | bar | switch | | | | |
-| Clock | bar | pin calendar | | | | calendar |
+| Clock | bar | dashboard | | | | calendar |
 | Network | rail | pin details | | | | state + networks |
 | Bluetooth | rail | pin details | | | | state + devices |
 | Volume | rail | pin audio | | | volume | state + scroll hint + audio |