waybar: add network widget, margins, border and rounded corners

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/waybar/config

@@ -2,6 +2,8 @@
   "layer": "top",
   "position": "top",
   "height": 24,
+  "margin-left": 250,
+  "margin-right": 250,
   "modules-left": ["custom/nurgle", "sway/workspaces"],
 
   "custom/nurgle": {
@@ -9,7 +11,7 @@
     "tooltip": false
   },
   "modules-center": ["clock"],
-  "modules-right": ["cpu", "battery"],
+  "modules-right": ["custom/network", "cpu", "battery"],
 
   "sway/workspaces": {
     "disable-scroll": true
@@ -20,6 +22,12 @@
     "interval": 60
   },
 
+  "custom/network": {
+    "exec": "~/.local/bin/waybar-network.sh",
+    "interval": 2,
+    "format": "{}"
+  },
+
   "cpu": {
     "format": "CPU {usage}%",
     "interval": 2