theme: soften the YoRHa shapes; SUPER+D opens the dashboard

The square markers, block meters and hard-cornered fills read as boxy
next to the porthole. The desktop is now soft throughout: the porthole
is the shape everything is built around and every smaller surface echoes
it.

- Theme gains radiusS / radiusM / radiusL. radiusL is frameRadius - padS,
  so anything inset padS inside one of the frame's curves is concentric
  with it.
- P5Panel and Skew draw rounded rectangles (Geom.roundedRect) whenever
  they neither lean nor are chopped, which is always now; the polygon
  path is kept for shapes brought back on purpose.
- Markers are dots; workspace pips, toggles, transport and media chips,
  notification actions and today's date are pills or discs; the slider
  handle is round. Meters are one continuous rounded line that glides to
  its level instead of a row of segments.
- Album art is rounded with ClippingRectangle in the bar, the media
  popout and the dashboard.
- Free-standing panels (launcher, ask) drop the corner brackets and take
  the frame radius.
- Fix: a hovered notification's wash was a full-bleed square, so in the
  drawer's bottom corner it ran past the drawer's curve. It is inset by
  padS/2 and rounded by radiusL, which keeps it inside the curve.

Hyprland: the discord special workspace and its window rule are gone,
SUPER+S stays the only scratchpad, and SUPER+D now opens the dashboard
(it was on SUPER+I).

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

quickshell/components/Skew.qml

@@ -3,7 +3,8 @@ import QtQuick.Shapes
 import "root:/config"
 import "root:/components"
 
-// A leaning block — the small-scale counterpart to P5Panel.
+// A small block — the small-scale counterpart to P5Panel. Upright and rounded
+// under the YoRHa theme; it still leans if given a lean.
 //
 // Every tick, rule, meter segment and slider rail in this shell leans at
 // Theme.skew. Shearing a plain Rectangle with a Matrix4x4 does that, but Qt
@@ -31,6 +32,11 @@ Shape {
     // rail slab.
     property bool vertical: false
 
+    // Corner radius for an upright piece, clamped to a pill. Small by default,
+    // so a meter segment or a hover wash reads soft rather than as a block;
+    // a hairline stays a hairline.
+    property real radius: Theme.radiusS
+
     // NOTE ON SIZING. The lean shifts one edge by `lean * height` (or by
     // `lean * width` when vertical), and the piece that actually gets painted is
     // what is left: a Skew declared 1px wide and 20px tall does not draw a 1px
@@ -55,14 +61,16 @@ Shape {
         joinStyle: ShapePath.MiterJoin
         capStyle: ShapePath.FlatCap
 
-        PathPolyline {
+        PathSvg {
             path: {
                 const w = root.width, h = root.height, l = root.lean;
+                if (l === 0)
+                    return Geom.roundedRect(w, h, root.radius);
                 if (root.vertical)
-                    return Geom.closed(root.leanLeft ? Geom.parallelogramVL(w, h, l)
-                                                     : Geom.parallelogramV(w, h, l));
-                return Geom.closed(root.leanLeft ? Geom.parallelogramL(w, h, l)
-                                                 : Geom.parallelogram(w, h, l));
+                    return Geom.svg(root.leanLeft ? Geom.parallelogramVL(w, h, l)
+                                                  : Geom.parallelogramV(w, h, l));
+                return Geom.svg(root.leanLeft ? Geom.parallelogramL(w, h, l)
+                                              : Geom.parallelogram(w, h, l));
             }
         }
     }