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, 35 insertions, 0 deletions

diff --git a/dotfiles/common/.zsh/lib/-ftb-generate-header b/dotfiles/common/.zsh/lib/-ftb-generate-header
new file mode 100644
index 0000000..a54fee1
--- /dev/null
+++ b/dotfiles/common/.zsh/lib/-ftb-generate-header
@@ -0,0 +1,35 @@
+#!/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