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

themes/palettes/matte-black/colors.toml

@@ -0,0 +1,23 @@
+accent = "#e68e0d"
+cursor = "#eaeaea"
+foreground = "#bebebe"
+background = "#121212"
+selection_foreground = "#bebebe"
+selection_background = "#333333"
+
+color0 = "#333333"
+color1 = "#D35F5F"
+color2 = "#FFC107"
+color3 = "#b91c1c"
+color4 = "#e68e0d"
+color5 = "#D35F5F"
+color6 = "#bebebe"
+color7 = "#bebebe"
+color8 = "#8a8a8d"
+color9 = "#B91C1C"
+color10 = "#FFC107"
+color11 = "#b90a0a"
+color12 = "#f59e0b"
+color13 = "#B91C1C"
+color14 = "#eaeaea"
+color15 = "#ffffff"