Theme-linked glow and terminal, tabs, fonts and layout tweaks

- Real window glow (decoration.glow) plus borders and tab bar take their
  colours from DMS (hypr/dms/colors.lua); Hyprland reloads when DMS changes
  the theme.
- kitty: colours and tab colours come from DMS (dank-theme/dank-tabs),
  no more hard-coded palette.
- Group (tab) mode: Mod+W tabs the whole workspace, thinner tab bar.
- Fullscreen programs keep the DMS bar (Mod+F maximizes, Mod+Shift+F is real
  fullscreen); per-monitor workspace switching on Mod+Tab.
- Less jelly animations, smaller gaps, weaker glow.
- JetBrains Mono is the default monospace font (fontconfig + install.sh).
- DMS settings: purple theme, popup transparency 0.98.

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

dms/settings.json

@@ -346,7 +346,7 @@
     }
   ],
   "configVersion": 42,
-  "popupTransparency": 0.95,
+  "popupTransparency": 0.98,
   "fontFamily": "JetBrains Mono Medium",
   "audioVisualizerEnabled": true,
   "scrollTitleEnabled": true,
@@ -489,7 +489,7 @@
   "displayFontFamily": "JetBrains Mono",
   "fontWeight": 300,
   "fontScale": 1,
-  "currentThemeName": "pink",
+  "currentThemeName": "purple",
   "wallpaperFillMode": "Fill",
   "connectedFrameBarStyleBackups": {},
   "frameEnabled": false,