dock: drop to the edge where the pill does not draw

The rail takes its handle to opacity 0 on home and the dock went on
reserving 32px for it, in the drawing and the input mask alike. Only the
drawing collapses — the rail still takes both swipes there, and a dock
that claimed those pixels would eat the gesture.

surfaces/quickshell/modules/ii/dock/Dock.qml

@@ -326,6 +326,18 @@ Scope { // Scope
             // visually empty and must also be absent from the dock's *input*
             // region; otherwise the dock receives touches before the rail.
             readonly property int gestureRailHeight: Config.options?.dock.gestureRailHeight ?? 32
+            // The rail draws nothing on home — `SystemGestureRail` takes the
+            // handle's opacity to 0 there, which is Casey's own call from
+            // 2026-08-05: *"above the dock it has no function."* The dock went
+            // on reserving the strip anyway, so home had 32 px of gap under the
+            // bar holding space for a pill that was never going to appear.
+            //
+            // Only the *drawing* collapses. The input reservation above stays
+            // exactly where it is, because the rail still takes both swipes on
+            // home and a dock that claimed those pixels would eat the gesture.
+            readonly property int railVisualHeight:
+                ViewtopControl.activeZone === ViewtopControl.homeZone
+                    ? 0 : gestureRailHeight
             visible: !GlobalStates.screenLocked && reveal
 
             anchors {
@@ -399,12 +411,16 @@ Scope { // Scope
                             // Reserve the rail: bottom-anchor short of the
                             // window's bottom so the dock never covers it.
                             bottom: parent.bottom
-                            bottomMargin: dockRoot.gestureRailHeight
+                            bottomMargin: dockRoot.railVisualHeight
                             horizontalCenter: parent.horizontalCenter
                         }
 
+                        Behavior on anchors.bottomMargin {
+                            animation: Appearance.animation.elementMove.numberAnimation.createObject(this)
+                        }
+
                         implicitWidth: dockRow.implicitWidth + 5 * 2
-                        height: parent.height - Appearance.sizes.elevationMargin - Appearance.sizes.hyprlandGapsOut - dockRoot.gestureRailHeight
+                        height: parent.height - Appearance.sizes.elevationMargin - Appearance.sizes.hyprlandGapsOut - dockRoot.railVisualHeight
 
                         StyledRectangularShadow {
                             target: dockVisualBackground