refactor(quickshell): drop the Persona names from the primitives

P5Panel, P5Button, P5Slider and P5Tooltip become Panel, ActionButton,
LevelSlider and Tooltip. ActionButton and LevelSlider avoid clashing
with QtQuick.Controls, which the ask panel imports.

quickshell/bar/RailIcon.qml

@@ -122,7 +122,7 @@ Item {
     }
 
     // Leading-edge wipe. On the rail this runs vertically down the left side,
-    // mirroring the accent bar P5Panel puts on horizontal modules.
+    // mirroring the accent bar Panel puts on horizontal modules.
     //
     // Held off the edge by `wipeInset`: the icon spans the rail's full width, so
     // at x = 0 this landed exactly on the slab's own border.
@@ -162,7 +162,7 @@ Item {
         onWheel: event => root.scrolled(event.angleDelta.y)
     }
 
-    P5Tooltip {
+    Tooltip {
         anchorItem: root
         triggerHovered: root.hovered
         title: root.label