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/bar/Clock.qml

@@ -3,8 +3,10 @@ import Quickshell
 import "root:/config"
 import "root:/components"
 import "root:/popouts"
+import "root:/services"
 
-// Centre-stage clock. Hovering drops the calendar.
+// Centre-stage clock. Hovering drops the calendar; clicking drops the
+// dashboard, which carries the calendar too.
 BarPill {
     id: root
 
@@ -20,7 +22,7 @@ BarPill {
         precision: SystemClock.Minutes
     }
 
-    onClicked: calendar.pinned = !calendar.pinned
+    onClicked: Actions.toggleDashboard()
 
     Row {
         id: layout
@@ -116,7 +118,8 @@ BarPill {
     CalendarPopout {
         id: calendar
         anchorItem: root
-        triggerHovered: root.hovered
+        // Not while the dashboard is down: it already shows the month.
+        triggerHovered: root.hovered && !Actions.dashboardOpen
         clockDate: clock.date
     }
 }