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/configs.nix

@@ -0,0 +1,69 @@
+{ config, pkgs, lib, ... }:
+
+let
+  configDir = ../../config;
+
+  # Explicit list of config items to manage
+  # This replaces dynamic builtins.readDir for clarity and faster evaluation
+  configItems = {
+    # Directories
+    btop = "directory";
+    chromium = "directory";
+    elephant = "directory";
+    "environment.d" = "directory";
+    fastfetch = "directory";
+    fcitx5 = "directory";
+    fontconfig = "directory";
+    ghostty = "directory";
+    git = "directory";
+    hypr = "directory";
+    "hyprland-preview-share-picker" = "directory";
+    imv = "directory";
+    kitty = "directory";
+    lazygit = "directory";
+    nomarchy = "directory";
+    opencode = "directory";
+    systemd = "directory";
+    tmux = "directory";
+    Typora = "directory";
+    uwsm = "directory";
+    wiremix = "directory";
+    xournalpp = "directory";
+
+    # Files
+    "brave-flags.conf" = "regular";
+    "chromium-flags.conf" = "regular";
+    "starship.toml" = "regular";
+    "xdg-terminals.list" = "regular";
+  };
+
+  # Files/directories handled elsewhere or not intended for ~/.config/
+  # - nomarchy.ttf: font file, not a config
+  # - waybar: handled in waybar.nix
+  # - walker: handled in walker.nix
+  # - alacritty: handled in alacritty.nix
+  # - swayosd: handled in swayosd.nix
+
+  # Check for user overrides
+  userConfigDir = config.nomarchy.configOverrides;
+  hasUserOverrides = userConfigDir != null && builtins.pathExists userConfigDir;
+
+  # Generate the xdg.configFile attribute set
+  makeMapping = name: type:
+    let
+      hasUserOverride = hasUserOverrides && builtins.pathExists "${userConfigDir}/${name}";
+      source = if hasUserOverride then "${userConfigDir}/${name}" else "${configDir}/${name}";
+    in {
+      inherit name;
+      value = lib.mkDefault {
+        inherit source;
+        recursive = type == "directory";
+      };
+    };
+
+  configMappings = lib.mapAttrs' (name: type: makeMapping name type) configItems;
+
+in
+{
+  xdg.configFile = configMappings;
+}