feat: create new home/ directory structure for profile-based config

New structure:
- home/base/        - Always loaded (shell, cli-tools, secrets)
- home/coding/      - Profile-independent dev tooling (editor, lsp, git, agents)
- home/profiles/    - Freely combinable profiles (gaming, media)
- home/desktop/     - Desktop-only (wm, apps, theme)
- home/server/      - Minimal server stub

Migration sources:
- home/features/cli/ → home/base/{shell,cli-tools,secrets}
- home/features/desktop/hyprland,wayland,rofi → home/desktop/wm/
- home/features/desktop/obsidian,office,webapps,crypto → home/desktop/apps/
- home/features/desktop/fonts,theme,wallpapers → home/desktop/theme/
- gaming.nix split → home/profiles/gaming/{steam,gamescope}
- media.nix split  → home/profiles/media/{obs,ffmpeg,yt-dlp,kdenlive,handbrake}

Option namespaces updated:
- features.cli.*  → base.shell.* / base.cliTools.* / base.secrets
- features.desktop.* → desktop.wm.* / desktop.apps.* / desktop.theme.*
- features.desktop.gaming → profiles.gaming.*
- features.desktop.media  → profiles.media.*

Verified: nix flake check passes (warnings only)

home/desktop/theme/default.nix

@@ -0,0 +1,8 @@
+# Theme aggregator — fonts, GTK/Qt theming, and wallpapers.
+{...}: {
+  imports = [
+    ./fonts.nix
+    ./theme.nix
+    ./wallpapers.nix
+  ];
+}

home/desktop/theme/fonts.nix

@@ -0,0 +1,24 @@
+# Font packages — Fira Code, JetBrains Mono Nerd Font, and supporting icon fonts.
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+with lib; let
+  cfg = config.desktop.theme.fonts;
+in {
+  options.desktop.theme.fonts.enable = mkEnableOption "install desktop fonts";
+
+  config = mkIf cfg.enable {
+    home.packages = with pkgs; [
+      fira-code
+      fira-code-symbols
+      nerd-fonts.fira-code
+      nerd-fonts.jetbrains-mono
+      font-manager
+      font-awesome_5
+      noto-fonts
+    ];
+  };
+}

home/desktop/theme/theme.nix

@@ -0,0 +1,24 @@
+# GTK and Qt theming — Dracula theme with matching icons and cursor.
+{
+  pkgs,
+  config,
+  ...
+}: {
+  qt = {
+    enable = true;
+    platformTheme.name = "gtk";
+  };
+
+  gtk = {
+    enable = true;
+    theme = {
+      name = "Dracula";
+      package = pkgs.dracula-theme;
+    };
+    iconTheme = {
+      name = "Dracula";
+      package = pkgs.dracula-icon-theme;
+    };
+    gtk4.theme = config.gtk.theme;
+  };
+}

home/desktop/theme/wallpapers.nix

@@ -0,0 +1,19 @@
+# Wallpaper collection — copies wallpapers to Hyprland config directory.
+{
+  config,
+  lib,
+  ...
+}:
+with lib; let
+  cfg = config.desktop.theme.wallpapers;
+in {
+  options.desktop.theme.wallpapers = mkEnableOption "wallpapers for Hyprland";
+
+  config = mkIf cfg {
+    xdg.configFile."hypr/wallpapers" = {
+      # Wallpapers are stored relative to the home/m3tam3re directory.
+      source = ../../../m3tam3re/wallpapers;
+      recursive = true;
+    };
+  };
+}