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>

hypr/lua/binds/shell.lua

@@ -9,7 +9,7 @@ end
 shell("lock", { key = mod .. " + CTRL + L", description = "lock screen" })
 shell("power", { key = mod .. " + P", description = "power menu" })
 shell("ask", { key = mod .. " + A", description = "ask claude" })
-shell("dashboard", { key = mod .. " + I", description = "dashboard" })
+shell("dashboard", { key = mod .. " + D", description = "dashboard" })
 shell("toggleDnd", { key = mod .. " + SHIFT + N", description = "toggle do not disturb" })
 shell("clearNotifications", { key = mod .. " + CTRL + SHIFT + N", description = "clear notifications" })
 shell("reloadConfig", { key = mod .. " + SHIFT + R", description = "reload shell config" })