Fix basename error in dotfiles installation

- Properly handle . and .. in dotfile copy loop
- Change directory before listing to avoid path issues
- Explicitly exclude . and .. from file copying

🤖 Generated with [Claude Code](https://claude.ai/code)

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

post-install.sh

@@ -92,10 +92,13 @@ echo "[+] Installing dotfiles..."
 su - ${ALMA_USER} -c '
     cd && 
     git clone https://git.dominik-roth.eu/dodox/nullpoint.git /tmp/nullpoint-dotfiles && 
-    for file in /tmp/nullpoint-dotfiles/dotfiles/.*; do
-        [ -f "$file" ] && cp "$file" . 2>/dev/null || true
+    cd /tmp/nullpoint-dotfiles/dotfiles && 
+    for file in .*; do
+        if [ -f "$file" ] && [ "$file" != "." ] && [ "$file" != ".." ]; then
+            cp "$file" ~/ 2>/dev/null || true
+        fi
     done &&
-    rm -rf /tmp/nullpoint-dotfiles
+    cd && rm -rf /tmp/nullpoint-dotfiles
 ' || echo "WARNING: dotfiles installation failed"
 
 # Set up MOTD