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/Geom.qml

@@ -3,9 +3,10 @@ pragma Singleton
 import QtQuick
 import Quickshell
 
-// Polygon maths for panel shapes. Under the YoRHa theme nothing leans and
-// nothing is chopped (Theme.skew and Theme.cut are 0), so these collapse to
-// plain rectangles; they are kept so a shape can be brought back on purpose.
+// Shape maths for panels. Under the YoRHa theme nothing leans and nothing is
+// chopped (Theme.skew and Theme.cut are 0); surfaces are rounded rectangles
+// (roundedRect). The polygon helpers are kept so a shape can be brought back
+// on purpose.
 // Originally the Persona 5 panel language: everything leans, and corners
 // get chopped rather than rounded.
 Singleton {
@@ -89,6 +90,25 @@ Singleton {
         return root.closed(out);
     }
 
+    // A polygon as an SVG path string, for PathSvg.
+    function svg(pts: var): string {
+        if (pts.length === 0) return "";
+        let d = `M ${pts[0].x} ${pts[0].y}`;
+        for (let i = 1; i < pts.length; i++) d += ` L ${pts[i].x} ${pts[i].y}`;
+        return d + " Z";
+    }
+
+    // A w x h rectangle with every corner rounded by `r`, clamped so a short
+    // piece becomes a pill rather than folding over itself.
+    function roundedRect(w: real, h: real, r: real): string {
+        const k = Math.max(0, Math.min(r, w / 2, h / 2));
+        if (k <= 0) return root.svg([Qt.point(0, 0), Qt.point(w, 0), Qt.point(w, h), Qt.point(0, h)]);
+        return `M ${k} 0 H ${w - k} A ${k} ${k} 0 0 1 ${w} ${k}`
+             + ` V ${h - k} A ${k} ${k} 0 0 1 ${w - k} ${h}`
+             + ` H ${k} A ${k} ${k} 0 0 1 0 ${h - k}`
+             + ` V ${k} A ${k} ${k} 0 0 1 ${k} 0 Z`;
+    }
+
     function closed(pts: var): var {
         if (pts.length === 0) return pts;
         const out = pts.slice();