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/rose-pine/colors.toml

@@ -0,0 +1,23 @@
+accent = "#56949f"
+cursor = "#cecacd"
+foreground = "#575279"
+background = "#faf4ed"
+selection_foreground = "#575279"
+selection_background = "#dfdad9"
+
+color0 = "#f2e9e1"
+color1 = "#b4637a"
+color2 = "#286983"
+color3 = "#ea9d34"
+color4 = "#56949f"
+color5 = "#907aa9"
+color6 = "#d7827e"
+color7 = "#575279"
+color8 = "#9893a5"
+color9 = "#b4637a"
+color10 = "#286983"
+color11 = "#ea9d34"
+color12 = "#56949f"
+color13 = "#907aa9"
+color14 = "#d7827e"
+color15 = "#575279"