Customize waybar with Catppuccin Latte theme and niri modules

- Replace sway modules with niri/workspaces, niri/window, niri/language
- Remove battery, backlight, mpd (desktop machine)
- Add custom modules: GPU (nvidia-smi), weather (wttr.in), mail (Thunderbird)
- Add disk, privacy modules
- Catppuccin Latte colors with Mocha dark background
- Wi-Fi signal level icon, bold 15px font
- Scripts for GPU, weather, and mail monitoring

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

bazzite/waybar/scripts/gpu.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+data=$(nvidia-smi --query-gpu=utilization.gpu,temperature.gpu --format=csv,noheader,nounits 2>/dev/null)
+if [ -z "$data" ]; then
+    echo '{"text": "N/A", "tooltip": "nvidia-smi not available"}'
+    exit 0
+fi
+usage=$(echo "$data" | cut -d',' -f1 | tr -d ' ')
+temp=$(echo "$data" | cut -d',' -f2 | tr -d ' ')
+echo "{\"text\": \"${usage}% ${temp}°C\", \"tooltip\": \"GPU: ${usage}%\\nTemp: ${temp}°C\", \"class\": \"\"}"