feat: add battery widget to waybar

waybar/config

@@ -16,6 +16,7 @@
         "hyprland/language",
         "custom/notifications",
         "custom/idle-inhibit",
+        "battery",
         "custom/power"
     ],
 
@@ -114,6 +115,23 @@
         "format": " ⏻ ",
         "tooltip": false,
         "on-click": "wlogout --protocol layer-shell"
+    },
+
+    "battery": {
+    	"bat": "BAT0",
+    	"interval": 60,
+    	"states": {
+    		"warning": 30,
+    		"critical": 15
+    	},
+    	"events": {
+    		"on-discharging-warning": "notify-send -u normal 'Low Battery'",
+    		"on-discharging-critical": "notify-send -u critical 'Very Low Battery'",
+    		"on-charging-100": "notify-send -u normal 'Battery Full!'"
+    	},
+    	"format": "{capacity}% {icon}",
+    	"format-icons": ["", "", "", "", ""],
+    	"max-length": 25
     }
 }