refactor(dotfiles): rename system/ to common/ and remove unused configs

Rename dotfiles/system to dotfiles/common for clarity - indicates
shared dotfiles used across all desktop environments (DWM, Hyprland).

Removed config directories for uninstalled applications:
- ghostty (using different terminal)
- lf (using ranger instead)
- mopidy (using mpd instead)
- nitrogen (X11-only, obsolete for Wayland)
- pychess (not installed)
- JetBrains (not installed via archsetup)
- youtube-dl (using yt-dlp with different config location)

Kept audacious config for potential future use.

Updated all references in archsetup, CLAUDE.md, todo.org, and
validation.sh.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

1 files changed, 0 insertions, 35 deletions

diff --git a/dotfiles/system/.zsh/lib/-ftb-generate-header b/dotfiles/system/.zsh/lib/-ftb-generate-header
deleted file mode 100644
index a54fee1..0000000
--- a/dotfiles/system/.zsh/lib/-ftb-generate-header
+++ /dev/null
@@ -1,35 +0,0 @@
-#!/hint/zsh
-
-typeset -ga _ftb_headers=()
-local i tmp group_colors
-local -i mlen=0 len=0
-
-if (( $#_ftb_groups == 1 )) && { ! -ftb-zstyle -m single-group "header" }; then
-  return
-fi
-
-# calculate the max column width
-for i in $_ftb_groups; do
-  (( $#i > mlen )) && mlen=$#i
-done
-mlen+=1
-
--ftb-zstyle -a group-colors group_colors || group_colors=($_ftb_group_colors)
-
-for (( i=1; i<=$#_ftb_groups; i++ )); do
-  [[ $_ftb_groups[i] == "__hide__"* ]] && continue
-
-  if (( len + $#_ftb_groups[i] > COLUMNS - 5 )); then
-    _ftb_headers+=$tmp
-    tmp='' && len=0
-  fi
-  if (( len + mlen > COLUMNS - 5 )); then
-    # the last column doesn't need padding
-    _ftb_headers+=$tmp$group_colors[i]$_ftb_groups[i]$'\033[00m'
-    tmp='' && len=0
-  else
-    tmp+=$group_colors[i]${(r:$mlen:)_ftb_groups[i]}$'\033[00m'
-    len+=$mlen
-  fi
-done
-(( $#tmp )) && _ftb_headers+=$tmp