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/osaka-jade/colors.toml

@@ -0,0 +1,23 @@
+accent = "#509475"
+cursor = "#D7C995"
+foreground = "#C1C497"
+background = "#111c18"
+selection_foreground = "#111C18"
+selection_background = "#C1C497"
+
+color0 = "#23372B"
+color1 = "#FF5345"
+color2 = "#549e6a"
+color3 = "#459451"
+color4 = "#509475"
+color5 = "#D2689C"
+color6 = "#2DD5B7"
+color7 = "#F6F5DD"
+color8 = "#53685B"
+color9 = "#db9f9c"
+color10 = "#63b07a"
+color11 = "#E5C736"
+color12 = "#ACD4CF"
+color13 = "#75bbb3"
+color14 = "#8CD3CB"
+color15 = "#9eebb3"