feat(core): migrate system state to unified declarative JSON

- Consolidate all configuration toggles (suspend, idle, waybar, etc.) into ~/.config/home-manager/state.json
- Introduce nomarchy.toggles and nomarchy.hyprland options in Nix
- Inject toggle states into all bin/ scripts via environment variables
- Update toggle scripts to mutate JSON and trigger background rebuilds
- Add a migration script to transition legacy flag files to the new format

bin/nomarchy-hyprland-window-gaps-toggle

@@ -2,14 +2,14 @@
 
 # Toggles the window gaps globally between no gaps and the default 10/5/2, declaratively and instantly.
 
-STATE_FILE="$HOME/.config/home-manager/hyprland-state.json"
+STATE_FILE="$HOME/.config/home-manager/state.json"
 mkdir -p "$(dirname "$STATE_FILE")"
 
 if [ ! -f "$STATE_FILE" ]; then
-    echo '{"gaps_out": 10, "gaps_in": 5, "border_size": 2}' > "$STATE_FILE"
+    echo "{}" > "$STATE_FILE"
 fi
 
-gaps=$(jq -r '.gaps_out' "$STATE_FILE")
+gaps=$(jq -r '.hyprland.gaps_out // 10' "$STATE_FILE")
 
 if [[ $gaps == "0" ]]; then
   NEW_STATE='{"gaps_out": 10, "gaps_in": 5, "border_size": 2}'
@@ -23,5 +23,7 @@ else
   hyprctl keyword general:border_size 0
 fi
 
-echo "$NEW_STATE" > "$STATE_FILE"
+TMP_JSON=$(mktemp)
+jq ".hyprland = $NEW_STATE" "$STATE_FILE" > "$TMP_JSON" && mv "$TMP_JSON" "$STATE_FILE"
+
 echo "Toggled gaps to $NEW_STATE declaratively."