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/hyprland/themes/lumon/hyprland.conf

@@ -0,0 +1,26 @@
+$activeBorderColor = rgb(f2fcff)
+$activeShadowColor = rgb(6fb8e3)
+$inactiveBorderColor = rgba(30486099)
+$inactiveShadowColor = rgba(30486077)
+
+general {
+    col.active_border = $activeBorderColor
+    col.inactive_border = $inactiveBorderColor
+    gaps_in = 8
+    gaps_out = 16
+}
+
+group {
+    col.border_active = $activeBorderColor
+    col.border_inactive = $inactiveBorderColor
+}
+
+decoration {
+    shadow {
+      enabled = true
+      range = 16
+      render_power = 4
+      color = $activeShadowColor
+      color_inactive = $inactiveShadowColor
+    }
+}