Add bluetooth, improve waybar audio/network modules

- Enable bluetooth with blueman for speaker pairing
- Pulseaudio: headphone icon, mute indicator
- Network: show bandwidth up/down instead of interface name
- Bluetooth waybar module with catppuccin styling

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

nixos/ringtail/configuration.nix

@@ -73,6 +73,13 @@ in
     pulse.enable = true;
   };
 
+  # Bluetooth
+  hardware.bluetooth = {
+    enable = true;
+    powerOnBoot = true;
+  };
+  services.blueman.enable = true;
+
   # Fish shell
   programs.fish.enable = true;
 
@@ -237,17 +244,22 @@ in
         height = 30;
         modules-left = [ "sway/workspaces" "sway/mode" ];
         modules-center = [ "sway/window" ];
-        modules-right = [ "pulseaudio" "network" "clock" "tray" ];
+        modules-right = [ "pulseaudio" "bluetooth" "network" "clock" "tray" ];
         tray = { spacing = 8; };
         clock = { format = "{:%a %b %d  %H:%M}"; };
         network = {
-          format-wifi = "{essid} ({signalStrength}%)";
-          format-ethernet = "{ifname}";
+          interval = 2;
+          format-ethernet = "{bandwidthDownBits} down  {bandwidthUpBits} up";
+          format-wifi = "{essid} {bandwidthDownBits} down  {bandwidthUpBits} up";
           format-disconnected = "disconnected";
         };
         pulseaudio = {
-          format = "{volume}% {icon}";
-          format-icons = { default = [ "" ]; };
+          format = "{icon} {volume}%";
+          format-muted = " muted";
+          format-icons = {
+            headphone = "";
+            default = [ "" "" "" ];
+          };
         };
       }];
       style = ''
@@ -281,7 +293,13 @@ in
         #window {
           color: #a5adcb;
         }
-        #clock, #network, #pulseaudio, #tray {
+        #bluetooth {
+          color: #8aadf4;
+        }
+        #bluetooth.off, #bluetooth.disabled {
+          color: #6e738d;
+        }
+        #clock, #network, #pulseaudio, #bluetooth, #tray {
           padding: 0 12px;
           margin: 4px 2px;
           color: #cad3f5;