refactor: implement component-based architecture for enhanced maintainability

- Reorganize directory structure into core/, features/, and themes/
- Colocate application Nix logic, configs, scripts, and theme overrides
- Implement 'Inversion of Control' for theming: apps now pull theme-specific layouts
- Update flake.nix and shared library paths to match the new structure
- Document the new Feature-Centric architecture in README.md

features/desktop/scripts/nomarchy-hyprland-window-gaps-toggle

@@ -0,0 +1,30 @@
+#!/usr/bin/env bash
+
+# Toggles the window gaps globally between no gaps and the default 10/5/2, declaratively and instantly.
+
+STATE_DIR="$HOME/.config/nomarchy"
+STATE_FILE="$STATE_DIR/state.json"
+mkdir -p "$STATE_DIR"
+
+if [ ! -f "$STATE_FILE" ]; then
+    echo "{}" > "$STATE_FILE"
+fi
+
+gaps=$(jq -r '.hyprland.gaps_out // 10' "$STATE_FILE")
+
+if [[ $gaps == "0" ]]; then
+  NEW_STATE='{"gaps_out": 10, "gaps_in": 5, "border_size": 2}'
+  hyprctl keyword general:gaps_out 10
+  hyprctl keyword general:gaps_in 5
+  hyprctl keyword general:border_size 2
+else
+  NEW_STATE='{"gaps_out": 0, "gaps_in": 0, "border_size": 0}'
+  hyprctl keyword general:gaps_out 0
+  hyprctl keyword general:gaps_in 0
+  hyprctl keyword general:border_size 0
+fi
+
+TMP_JSON=$(mktemp)
+jq --argjson state "$NEW_STATE" '.hyprland = $state' "$STATE_FILE" > "$TMP_JSON" && mv "$TMP_JSON" "$STATE_FILE"
+
+echo "Toggled gaps to $NEW_STATE declaratively."