refactor: migrate to template-based theme system, clean up old per-theme configs

- Remove per-theme app configs (alacritty, foot, ghostty, hyprland,
  hyprlock, mako, rofi, swayosd, tmux, walker, waybar, etc.) now
  handled by default/themed/ templates
- Update omarchy scripts (bg-next, list, set) for new template flow
- Update configs: bootstrap, nvim, rofi, tmux, mako
- Tweak installers (02-install-base.sh, btop, desktop, goose, nvim,
  obsidian, theme, tmux)
- Remove obsolete hyprland-rofi-* and hyprland-walker-* scripts
- Update neovim.lua across remaining themes

themes/everforest/btop.theme

@@ -22,7 +22,7 @@ theme[selected_bg]="#3d484d"
 theme[selected_fg]="#dbbc7f"
 
 # Color of inactive/disabled text
-theme[inactive_fg]="#2d353b"  
+theme[inactive_fg]="#2d353b"
 
 # Color of text appearing on top of graphs, i.e uptime and current network graph scaling
 theme[graph_text]="#d3c6aa"