feat(waybar): island floating 3-pills + popups + deploy

- Config waybar 3-pills glassmorphism (left/center/right)
- Scripts : gpu, network, power-profile (toggle+luminosité/profil),
  cava daemon+reader, wob (volume/luminosité), rofi-launcher
- Popup media GTK3 : volume sortie+entrée + luminosité (vc-media-popup.py)
- Profil énergie : cycle balanced→low-power→performance avec brightnessctl
- Autostart COSMIC : waybar.desktop + wob.desktop
- Thème COSMIC Light ajouté (accent violet-chaton)
- deploy : +autostart, +sudoers platform_profile, +udev platform_profile,
  +scripts .py waybar, +CosmicTheme.Light

INSTALL/themes/cosmic/com.system76.CosmicTheme.Light/v1/spacing

@@ -0,0 +1,12 @@
+(
+    space_none: 0,
+    space_xxxs: 4,
+    space_xxs: 4,
+    space_xs: 8,
+    space_s: 8,
+    space_m: 16,
+    space_l: 24,
+    space_xl: 32,
+    space_xxl: 48,
+    space_xxxl: 64,
+)