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, 17 insertions, 0 deletions

diff --git a/dotfiles/common/.local/bin/cron/checkup b/dotfiles/common/.local/bin/cron/checkup
new file mode 100755
index 0000000..bd3c634
--- /dev/null
+++ b/dotfiles/common/.local/bin/cron/checkup
@@ -0,0 +1,17 @@
+#!/bin/sh
+
+# Syncs repositories and downloads updates, meant to be run as a cronjob.
+
+notify-send "📦 Repository Sync" "Checking for package updates..."
+
+sudo pacman -Syyuw --noconfirm || notify-send "Error downloading updates.
+
+Check your internet connection, if pacman is already running, or run update manually to see errors."
+pkill -RTMIN+8 "${STATUSBAR:-dwmblocks}"
+
+if pacman -Qu | grep -v "\[ignored\]"
+then
+	notify-send "🎁 Repository Sync" "Updates available. Click statusbar icon (📦) for update."
+else
+	notify-send "📦 Repository Sync"  "Sync complete. No new packages for update."
+fi