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, 12 insertions, 0 deletions

diff --git a/dotfiles/common/.local/bin/ifinstalled b/dotfiles/common/.local/bin/ifinstalled
new file mode 100755
index 0000000..c192eba
--- /dev/null
+++ b/dotfiles/common/.local/bin/ifinstalled
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+# Some optional functions in LARBS require programs not installed by default. I
+# use this little script to check to see if a command exists and if it doesn't
+# it informs the user that they need that command to continue. This is used in
+# various other scripts for clarity's sake.
+
+for x in "$@"; do
+	if ! which "$x" >/dev/null 2>&1 && ! pacman -Qq "$x" >/dev/null 2>&1; then
+ 		notify-send "📦 $x" "must be installed for this function." && exit 1 ;
+	fi
+done