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.

lib/default.nix

@@ -4,12 +4,17 @@
 
 let
   # Import theme palettes once - used by multiple modules
-  palettes = import ../themes/palettes;
+  palettes = import ./../themes/palettes;
 
   # Unified state reading function
   # Handles both JSON and plain text files with graceful fallbacks
   readState = { file, default }:
-    if builtins.pathExists file then
+    let 
+      # In pure evaluation mode (like nix build .#vm), absolute paths as strings
+      # will cause an error in pathExists/readFile.
+      isFileSafe = ! (builtins.isString file && lib.hasPrefix "/" file);
+    in
+    if isFileSafe && builtins.pathExists file then
       let
         content = builtins.readFile file;
         cleanContent = lib.removeSuffix "\n" content;
@@ -31,7 +36,7 @@ let
   # Read system state
   readSystemState =
     readState {
-      file = /etc/nixos/state.json;
+      file = "/etc/nixos/state.json";
       default = {};
     };