Improve waybar and custom scripts

modules/optionnals/desktop/config/etc/xdg/waybar/config-home-nix.jsonc

@@ -7,12 +7,13 @@
     "memory",
     "disk",
     "network",
-    "pulseaudio",
+    "pulseaudio"
   ],
   "modules-center": [
     "hyprland/workspaces"
   ],
   "modules-right": [
+    "custom/alert",
     "custom/maj",
     "clock",
     "tray"
@@ -78,11 +79,20 @@
     },
     "format": "{name}",
     "format-icons": {
-      "default": "",
-    },
+      "default": ""
+    }
+  },
+  "custom/alert": {
+    "exec": "/etc/xdg/scripts/waybar-mailbox.sh",
+    "interval": 300,
+    "return-type": "json",
+    "format": "{icon}{text}",
+    "format-icons": {
+      "default": "  "
+    }
   },
   "custom/maj": {
-    "exec": "/etc/xdg/scripts/update.sh",
+    "exec": "/etc/xdg/scripts/waybar-update.sh",
     "interval": 300,
     "return-type": "json",
     "format": "{icon}{text}",