Add a no-animations mode, on by default in VMs (#13550)

A machine without a GPU, like most VMs, renders through llvmpipe on the
CPU, where every animated frame and every translucent window costs. In a
VM, opening and closing a terminal took ~5s of CPU; a panel ~3.4s.

omarchy toggle animations (also under Toggle > Animations) places a Hyprland
flag that turns off animations, blur and shadows and makes windows opaque.
The shell follows Hyprland's animations:enabled, rereading it on every
config reload: its one-shot animations run for Style.duration(ms), which
is then 0, and its spinners, pulses and title marquee hold still. A new
install in a VM starts with the flag in place.

Measured in the ISO test VM (llvmpipe), CPU per interaction:
terminal open+close 5000ms -> 481ms, workspace switch 1670ms -> 409ms,
audio panel 3446ms -> 796ms, volume OSD 2324ms -> 584ms, menu 2028ms ->
1241ms.

Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

shell/plugins/panels/elsewhen/CityRow.qml

@@ -79,13 +79,13 @@ Rectangle {
       // The dragged row follows the pointer one-to-one; the others ease aside.
       Behavior on y {
         enabled: !row.dragged
-        NumberAnimation { duration: 130; easing.type: Easing.OutCubic }
+        NumberAnimation { duration: Style.duration(130); easing.type: Easing.OutCubic }
       }
     }
   ]
   z: dragged ? 2 : 0
   opacity: dragged ? 0.9 : 1
-  Behavior on opacity { NumberAnimation { duration: 120 } }
+  Behavior on opacity { NumberAnimation { duration: Style.duration(120) } }
 
   HoverHandler { id: rowHover }
 
@@ -219,7 +219,7 @@ Rectangle {
         spacing: Style.spacing.sm
         opacity: parent.greeting ? 0 : 1
         visible: opacity > 0
-        Behavior on opacity { NumberAnimation { duration: 110 } }
+        Behavior on opacity { NumberAnimation { duration: Style.duration(110) } }
 
         Caption {
           text: row.ready ? row.rowData.date : "\u2026"
@@ -242,7 +242,7 @@ Rectangle {
         spacing: Style.space(5)
         opacity: parent.greeting ? 1 : 0
         visible: opacity > 0
-        Behavior on opacity { NumberAnimation { duration: 110 } }
+        Behavior on opacity { NumberAnimation { duration: Style.duration(110) } }
 
         // Non-Latin scripts fall back per character through fontconfig.
         Caption {
@@ -304,7 +304,7 @@ Rectangle {
     // Shown on the keyboard's pick too, so Delete's target is plain.
     opacity: row.removable && row.lit ? 1 : 0
     visible: opacity > 0
-    Behavior on opacity { NumberAnimation { duration: 120 } }
+    Behavior on opacity { NumberAnimation { duration: Style.duration(120) } }
     onClicked: row.panel.removeCityAt(row.index)
   }
 

shell/plugins/panels/elsewhen/DaylightStrip.qml

@@ -115,7 +115,7 @@ Item {
         color: strip.foreground
       }
 
-      Behavior on x { NumberAnimation { duration: 400; easing.type: Easing.OutCubic } }
+      Behavior on x { NumberAnimation { duration: Style.duration(400); easing.type: Easing.OutCubic } }
     }
   }
 
@@ -182,7 +182,7 @@ Item {
       // Gone rather than faded, so a hidden arrow is also untappable.
       opacity: strip.hovered && !arrow.covered ? 1 : 0
       visible: opacity > 0
-      Behavior on opacity { NumberAnimation { duration: 160 } }
+      Behavior on opacity { NumberAnimation { duration: Style.duration(160) } }
 
       // Sunrise sits a little high and sunset a little low: a cue that needs no reading.
       transform: Translate { y: arrow.rising ? -Style.space(2) : Style.space(2) }

shell/plugins/panels/elsewhen/Globe.qml

@@ -338,9 +338,9 @@ Item {
   ParallelAnimation {
     id: flight
     NumberAnimation { id: flightSpin; target: root; property: "spin"
-                      duration: 800; easing.type: Easing.OutCubic }
+                      duration: Style.duration(800); easing.type: Easing.OutCubic }
     NumberAnimation { id: flightViewLat; target: root; property: "viewLat"
-                      duration: 800; easing.type: Easing.OutCubic }
+                      duration: Style.duration(800); easing.type: Easing.OutCubic }
   }
 
   // The throw: spin keeps going after the drag and eases to a stop.

shell/plugins/panels/elsewhen/HeroTitle.qml

@@ -137,7 +137,7 @@ Column {
         id: globeSpin
         target: heroIcon
         property: "spin"
-        duration: 1250
+        duration: Style.duration(1250)
         easing.type: Easing.OutQuart
       }
 
@@ -145,7 +145,7 @@ Column {
         id: focusSpin
         target: heroIcon
         property: "spin"
-        duration: 700
+        duration: Style.duration(700)
         easing.type: Easing.OutCubic
       }
     }

shell/plugins/panels/elsewhen/Panel.qml

@@ -631,7 +631,7 @@ Panel {
   // Heavy on the way out, brisk on the way back.
   Behavior on zoom {
     NumberAnimation {
-      duration: root.zoomDuration
+      duration: Style.duration(root.zoomDuration)
       easing.type: root.zoomEasing
     }
   }
@@ -649,14 +649,14 @@ Panel {
 
   Behavior on moonDemo {
     enabled: root.moonShowing
-    NumberAnimation { duration: 460; easing.type: Easing.InOutSine }
+    NumberAnimation { duration: Style.duration(460); easing.type: Easing.InOutSine }
   }
 
   NumberAnimation {
     id: dropAnimation
     target: root
     property: "dragOffset"
-    duration: 150
+    duration: Style.duration(150)
     easing.type: Easing.OutCubic
     onFinished: root.commitRowDrag()
   }
@@ -805,7 +805,7 @@ Panel {
           id: scrollAnim
           target: scroller
           property: "contentY"
-          duration: 160
+          duration: Style.duration(160)
           easing.type: Easing.OutCubic
         }