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

core/home/config/nomarchy/default/mako/core.ini

@@ -0,0 +1,34 @@
+anchor=top-right
+default-timeout=5000
+width=420
+outer-margin=20
+padding=10,15
+border-size=2
+max-icon-size=32
+font=sans-serif 14px
+
+[app-name=Spotify]
+invisible=1
+
+[mode=do-not-disturb]
+invisible=true
+
+[mode=do-not-disturb app-name=notify-send]
+invisible=false
+
+[urgency=critical]
+default-timeout=0
+layer=overlay
+
+[summary~="Setup Wi-Fi"]
+on-button-left=exec sh -c 'nomarchy-notification-dismiss "Setup Wi-Fi"; nomarchy-launch-wifi'
+
+[summary~="Update System"]
+on-button-left=exec sh -c 'nomarchy-notification-dismiss "Update System"; nomarchy-launch-floating-terminal-with-presentation nomarchy-update'
+
+[summary~="Learn Keybindings"]
+on-button-left=exec sh -c 'nomarchy-notification-dismiss "Learn Keybindings"; nomarchy-menu-keybindings'
+
+[summary~="Screenshot copied & saved"]
+max-icon-size=80
+format=<b>%s</b>\n%b