feat(system): professionalize system configurations

- Consolidate imperative system settings into /etc/nixos/state.json
- Implement nomarchy.system options for DNS, Wifi powersave, Timezone, and hardware features
- Add declarative browser policies for Chromium/Brave based on theme
- Update toggles scripts to mutate system JSON and run sys-update --impure
- Remove obsolete imperative browser theme and redundant system modules

modules/system/default.nix

@@ -2,12 +2,17 @@
 
 {
   imports = [
+    ./options.nix
+    ./state.nix
     ./plymouth.nix
     ./sddm.nix
     ./hardware.nix
     ./audio.nix
     ./bluetooth.nix
     ./network.nix
+    ./browser.nix
     ./impermanence.nix
   ];
+
+  time.timeZone = config.nomarchy.system.timezone;
 }