fix: resolve VM startup failures, broken Hyprland functionality, and theme integration

- Fix QEMU syntax and root filesystem conflicts in vm-guest.nix.
- Repair numerous broken relative paths and imports across the codebase.
- Set 'summer-night' as the default distro theme with full branding integration.
- Implement declarative system-wide font installation including the 'nomarchy' font.
- Fix Waybar startup by dynamically generating theme-aware CSS.
- Restore Hyprland keybindings (Super+Return, Super+Space) and wallpaper loading.
- Add missing scripts: nomarchy-launch-walker, nomarchy-toggle-waybar, nomarchy-refresh-config.
- Enable UWSM and correctly disable conflicting Hyprland systemd services.

features/scripts/utils/nomarchy-launch-walker

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+# Wrapper to launch walker with elephant provider, or fallback to rofi if walker is missing.
+
+if command -v walker >/dev/null 2>&1; then
+    if ! pgrep -x elephant > /dev/null; then
+        setsid uwsm-app -- elephant &
+    fi
+    exec uwsm-app -- walker "$@"
+elif command -v rofi >/dev/null 2>&1; then
+    # Convert walker arguments to rofi arguments if possible
+    # This is a very basic mapping for --dmenu
+    if [[ "$*" == *"--dmenu"* ]]; then
+        exec rofi -dmenu "$@"
+    else
+        exec rofi -show drun
+    fi
+else
+    notify-send "Error" "Neither walker nor rofi found." -u critical
+    exit 1
+fi