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/catppuccin/apps/btop.theme

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+# Main background, empty for terminal default, need to be empty if you want transparent background
+theme[main_bg]="#1E1E2E"
+
+# Main text color
+theme[main_fg]="#c6d0f5"
+
+# Title color for boxes
+theme[title]="#c6d0f5"
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#8caaee"
+
+# Background color of selected item in processes box
+theme[selected_bg]="#51576d"
+
+# Foreground color of selected item in processes box
+theme[selected_fg]="#8caaee"
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#838ba7"
+
+# Color of text appearing on top of graphs, i.e uptime and current network graph scaling
+theme[graph_text]="#f2d5cf"
+
+# Background color of the percentage meters
+theme[meter_bg]="#51576d"
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#f2d5cf"
+
+# CPU, Memory, Network, Proc box outline colors
+theme[cpu_box]="#ca9ee6" #Mauve
+theme[mem_box]="#a6d189" #Green
+theme[net_box]="#ea999c" #Maroon
+theme[proc_box]="#8caaee" #Blue
+
+# Box divider line and small boxes line color
+theme[div_line]="#737994"
+
+# Temperature graph color (Green -> Yellow -> Red)
+theme[temp_start]="#a6d189"
+theme[temp_mid]="#e5c890"
+theme[temp_end]="#e78284"
+
+# CPU graph colors (Teal -> Lavender)
+theme[cpu_start]="#81c8be"
+theme[cpu_mid]="#85c1dc"
+theme[cpu_end]="#babbf1"
+
+# Mem/Disk free meter (Mauve -> Lavender -> Blue)
+theme[free_start]="#ca9ee6"
+theme[free_mid]="#babbf1"
+theme[free_end]="#8caaee"
+
+# Mem/Disk cached meter (Sapphire -> Lavender)
+theme[cached_start]="#85c1dc"
+theme[cached_mid]="#8caaee"
+theme[cached_end]="#babbf1"
+
+# Mem/Disk available meter (Peach -> Red)
+theme[available_start]="#ef9f76"
+theme[available_mid]="#ea999c"
+theme[available_end]="#e78284"
+
+# Mem/Disk used meter (Green -> Sky)
+theme[used_start]="#a6d189"
+theme[used_mid]="#81c8be"
+theme[used_end]="#99d1db"
+
+# Download graph colors (Peach -> Red)
+theme[download_start]="#ef9f76"
+theme[download_mid]="#ea999c"
+theme[download_end]="#e78284"
+
+# Upload graph colors (Green -> Sky)
+theme[upload_start]="#a6d189"
+theme[upload_mid]="#81c8be"
+theme[upload_end]="#99d1db"
+
+# Process box color gradient for threads, mem and cpu usage (Sapphire -> Mauve)
+theme[process_start]="#85c1dc"
+theme[process_mid]="#babbf1"
+theme[process_end]="#ca9ee6"

themes/palettes/catppuccin/apps/neovim.lua

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+return {
+	{
+		"catppuccin/nvim",
+		name = "catppuccin",
+		priority = 1000,
+	},
+	{
+		"LazyVim/LazyVim",
+		opts = {
+			colorscheme = "catppuccin",
+		},
+	},
+}

themes/palettes/catppuccin/apps/vscode.json

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+{
+  "name": "Catppuccin Mocha",
+  "extension": "catppuccin.catppuccin-vsc"
+}