fix: rename battery group to avoid CSS ID conflict, clean up waybar styles

group/battery shared its CSS ID (#battery) with the battery module,
causing padding overrides to affect the group box instead of just the
module. Renamed to group/bat. Moved cpugov into indicators group.
Reorganized style.css sections for clarity.

defaults/xdg/waybar/config

@@ -17,16 +17,16 @@
     "modules-right": [
         "tray",
         "mpris",
-        "custom/cpugov",
         "bluetooth",
         "group/sound",
         "backlight",
-        "group/battery",
+        "group/bat",
         "group/indicators"
     ],
     "group/indicators": {
         "orientation": "inherit",
         "modules": [
+            "custom/cpugov",
             "gamemode",
             //"custom/updates",
             "idle_inhibitor",
@@ -58,7 +58,7 @@
             "transition-left-to-right": true
         }
     },
-    "group/battery": {
+    "group/bat": {
         "orientation": "inherit",
         "modules": [
             "battery",