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, 72 insertions, 0 deletions

diff --git a/dotfiles/common/.local/bin/dab b/dotfiles/common/.local/bin/dab
new file mode 100755
index 0000000..e7d0fae
--- /dev/null
+++ b/dotfiles/common/.local/bin/dab
@@ -0,0 +1,72 @@
+#!/bin/env bash
+# dab - delete all but
+# Craig Jennings <c@cjennings.net>
+# deletes all files in current directory that are NOT of a specific extension
+
+# default switch values
+recurse=""
+del_dirs=""
+
+# help function
+show_help() {
+    echo "Usage: $0 [extension] [OPTION]"
+    echo "Deletes all files that do not match the given extension from the current directory."
+    echo ""
+    echo "Options:"
+    echo "-r  Delete files in directories recursively."
+    echo "-d  Delete directories if they become empty after deletions."
+    echo "-h  Display this help message and exit."
+    echo ""
+    echo "Example: $0 txt -r -d"
+    echo "This would delete all non-text files in the current directory and subdirectories. Any directories emptied by this process will also be deleted."
+    echo ""
+    echo "Note: Directories that were previously empty will remain untouched."
+}
+
+# if help was requested, show it and exit
+if [[ $1 = "-h" ]] || [[ $2 = "-h" ]] || [[ $3 = "-h" ]]; then
+    show_help
+    exit
+fi
+
+# error if nothing or * was passed
+if [[ -z $1 ]] || [[ $1 = "*" ]]; then
+    echo "ERROR: No file extension was provided or invalid extension ('*')."
+    show_help
+    exit
+fi
+
+# identify rest of arguments
+ext=$1
+if [[ $2 == *"-r"* ]] || [[ $3 == *"-r"* ]]; then
+    recurse="-R"
+fi
+
+if [[ $2 == *"-d"* ]] || [[ $3 == *"-d"* ]]; then
+    del_dirs="true"
+fi
+
+# Save empty directories into an array before deleting the files
+empty_dirs=()
+while IFS=  read -r -d $'\0'; do
+    empty_dirs+=("$REPLY")
+done < <(find . -type d -empty -print0)
+
+shopt -s globstar nullglob extglob
+
+# remove non-matching files
+for file in **; do
+    if [[ -f "$file" ]] && [[ "$file" != *".$ext" ]]; then
+        rm "$file"
+    fi
+done
+
+# remove directories emptied by this operation
+if [[ $del_dirs == "true" ]]; then
+    for dir in **/; do
+        if [[ ! -n "$(ls -A $dir)" ]] && [[ ! "${empty_dirs[*]}" =~ $dir ]]; then
+            rmdir "$dir"
+        fi
+    done
+fi
+