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/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]="#faf4ed"
+# Base
+
+# Main text color
+theme[main_fg]="#575279"
+# Text
+
+# Title color for boxes
+theme[title]="#908caa"
+# Subtle
+
+# Highlight color for keyboard shortcuts
+theme[hi_fg]="#e0def4"
+# Text
+
+# Background color of selected item in processes box
+theme[selected_bg]="#524f67"
+# HL High
+
+# Foreground color of selected item in processes box
+theme[selected_fg]="#f6c177"
+# Gold
+
+# Color of inactive/disabled text
+theme[inactive_fg]="#403d52"
+# HL Med
+
+# Color of text appearing on top of graphs, i.e uptime and current network graph scaling
+theme[graph_text]="#9ccfd8"
+# Foam
+
+# Background color of the percentage meters
+theme[meter_bg]="#9ccfd8"
+# Foam
+
+# Misc colors for processes box including mini cpu graphs, details memory graph and details status text
+theme[proc_misc]="#c4a7e7"
+# Iris
+
+# Cpu box outline color
+theme[cpu_box]="#ebbcba"
+# Rose
+
+# Memory/disks box outline color
+theme[mem_box]="#31748f"
+# Pine
+
+# Net up/down box outline color
+theme[net_box]="#c4a7e7"
+# Iris
+
+# Processes box outline color
+theme[proc_box]="#eb6f92"
+# Love
+
+# Box divider line and small boxes line color
+theme[div_line]="#6e6a86"
+# Muted
+
+# Temperature graph colors
+theme[temp_start]="#ebbcba"
+# Rose
+theme[temp_mid]="#f6c177"
+# Gold
+theme[temp_end]="#eb6f92"
+# Love
+
+# CPU graph colors
+theme[cpu_start]="#f6c177"
+# Gold
+theme[cpu_mid]="#ebbcba"
+# Rose
+theme[cpu_end]="#eb6f92"
+# Love
+
+# Mem/Disk free meter
+# all love
+theme[free_start]="#eb6f92"
+theme[free_mid]="#eb6f92"
+theme[free_end]="#eb6f92"
+
+# Mem/Disk cached meter
+# all iris
+theme[cached_start]="#c4a7e7"
+theme[cached_mid]="#c4a7e7"
+theme[cached_end]="#c4a7e7"
+
+# Mem/Disk available meter
+# all pine
+theme[available_start]="#31748f"
+theme[available_mid]="#31748f"
+theme[available_end]="#31748f"
+
+# Mem/Disk used meter
+# all rose
+theme[used_start]="#ebbcba"
+theme[used_mid]="#ebbcba"
+theme[used_end]="#ebbcba"
+
+# Download graph colors
+# Pine for start, foam for the rest
+theme[download_start]="#31748f"
+theme[download_mid]="#9ccfd8"
+theme[download_end]="#9ccfd8"
+
+# Upload graph colors
+theme[upload_start]="#ebbcba"
+# Rose for start
+theme[upload_mid]="#eb6f92"
+# Love for mid and end
+theme[upload_end]="#eb6f92"
+
+# Process box color gradient for threads, mem and cpu usage
+theme[process_start]="#31748f"
+# Pine
+theme[process_mid]="#9ccfd8"
+# Foam for mid and end
+theme[process_end]="#9ccfd8"

themes/palettes/rose-pine/apps/chromium.theme

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+210,196,219

themes/palettes/rose-pine/apps/neovim.lua

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+return {
+	{ "rose-pine/neovim", name = "rose-pine" },
+	{
+		"LazyVim/LazyVim",
+		opts = {
+			colorscheme = "rose-pine-dawn",
+		},
+	},
+}

themes/palettes/rose-pine/apps/vscode.json

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+{
+  "name": "Rosé Pine Dawn",
+  "extension": "mvllow.rose-pine"
+}

themes/palettes/rose-pine/colors.toml

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+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"

themes/palettes/rose-pine/icons.theme

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+Yaru-blue

themes/palettes/rose-pine/light.mode

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+# This will set "prefer-light" and use "Adwaita" as the theme