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/background

@@ -0,0 +1,100 @@
+(
+    base: (
+        red: 0.20392156,
+        green: 0.109803915,
+        blue: 0.2901961,
+        alpha: 1.0,
+    ),
+    component: (
+        base: (
+            red: 0.28618598,
+            green: 0.19189146,
+            blue: 0.3797182,
+            alpha: 1.0,
+        ),
+        hover: (
+            red: 0.25756738,
+            green: 0.17270231,
+            blue: 0.3417464,
+            alpha: 1.0,
+        ),
+        pressed: (
+            red: 0.22894879,
+            green: 0.15351318,
+            blue: 0.30377457,
+            alpha: 1.0,
+        ),
+        selected: (
+            red: 0.25756738,
+            green: 0.17270231,
+            blue: 0.3417464,
+            alpha: 1.0,
+        ),
+        selected_text: (
+            red: 0.9058823,
+            green: 0.6117647,
+            blue: 0.99607843,
+            alpha: 1.0,
+        ),
+        focus: (
+            red: 0.9058823,
+            green: 0.6117647,
+            blue: 0.99607843,
+            alpha: 1.0,
+        ),
+        divider: (
+            red: 0.8318751,
+            green: 0.8318648,
+            blue: 0.80908096,
+            alpha: 0.2,
+        ),
+        on: (
+            red: 0.8318751,
+            green: 0.8318648,
+            blue: 0.80908096,
+            alpha: 1.0,
+        ),
+        disabled: (
+            red: 0.28618598,
+            green: 0.19189146,
+            blue: 0.3797182,
+            alpha: 0.5,
+        ),
+        on_disabled: (
+            red: 0.8318751,
+            green: 0.8318648,
+            blue: 0.80908096,
+            alpha: 0.65,
+        ),
+        border: (
+            red: 0.072988935,
+            green: 0.079405405,
+            blue: 0.14595589,
+            alpha: 1.0,
+        ),
+        disabled_border: (
+            red: 0.072988935,
+            green: 0.079405405,
+            blue: 0.14595589,
+            alpha: 0.5,
+        ),
+    ),
+    divider: (
+        red: 0.3609102,
+        green: 0.285616,
+        blue: 0.42522332,
+        alpha: 1.0,
+    ),
+    on: (
+        red: 0.98886484,
+        green: 0.98886436,
+        blue: 0.9653322,
+        alpha: 1.0,
+    ),
+    small_widget: (
+        red: 0.20783836,
+        green: 0.20930338,
+        blue: 0.23179808,
+        alpha: 0.25,
+    ),
+)