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

bin/nomarchy-tz-select

@@ -1,6 +1,12 @@
-#!/bin/bash
+#!/usr/bin/env bash
+
+# Select system timezone declaratively for Nomarchy NixOS.
+
+STATE_FILE="/etc/nixos/state.json"
 
 timezone=$(timedatectl list-timezones | gum filter --height 20 --header "Set timezone") || exit 1
-sudo timedatectl set-timezone "$timezone"
-echo "Timezone is now set to $timezone"
-nomarchy-restart-waybar
+
+sudo jq ".timezone = \"$timezone\"" "$STATE_FILE" > /tmp/state.json && sudo mv /tmp/state.json "$STATE_FILE"
+
+echo "Timezone is now set to $timezone. Applying changes..."
+sudo sys-update