feat: implement empty Library directory cleanup and Android NDK version check.

lib/clean/dev.sh

@@ -131,7 +131,23 @@ clean_dev_frontend() {
     safe_clean ~/.cache/prettier/* "Prettier cache"
 }
 # Mobile dev caches (can be large).
+# Check for multiple Android NDK versions.
+check_android_ndk() {
+    local ndk_dir="$HOME/Library/Android/sdk/ndk"
+    if [[ -d "$ndk_dir" ]]; then
+        local count
+        count=$(find "$ndk_dir" -mindepth 1 -maxdepth 1 -type d 2> /dev/null | wc -l | tr -d ' ')
+        if [[ "$count" -gt 1 ]]; then
+            note_activity
+            echo -e "  Found ${GREEN}${count}${NC} Android NDK versions"
+            echo -e "  You can delete unused versions manually: ${ndk_dir}"
+        fi
+    fi
+}
+
 clean_dev_mobile() {
+    check_android_ndk
+
     if command -v xcrun > /dev/null 2>&1; then
         debug_log "Checking for unavailable Xcode simulators"
         if [[ "$DRY_RUN" == "true" ]]; then

lib/clean/user.sh

@@ -5,6 +5,9 @@ clean_user_essentials() {
     start_section_spinner "Scanning caches..."
     safe_clean ~/Library/Caches/* "User app cache"
     stop_section_spinner
+    start_section_spinner "Scanning empty items..."
+    clean_empty_library_items
+    stop_section_spinner
     safe_clean ~/Library/Logs/* "User app logs"
     if is_path_whitelisted "$HOME/.Trash"; then
         note_activity
@@ -14,6 +17,19 @@ clean_user_essentials() {
     fi
 }
 
+clean_empty_library_items() {
+    local -a empty_dirs=()
+    while IFS= read -r -d '' dir; do
+        [[ -d "$dir" ]] && empty_dirs+=("$dir")
+    done < <(find "$HOME/Library" -mindepth 1 -maxdepth 1 -type d -empty -print0 2> /dev/null)
+
+    if [[ ${#empty_dirs[@]} -gt 0 ]]; then
+        safe_clean "${empty_dirs[@]}" "Empty Library folders"
+    fi
+
+    # Empty file cleanup is skipped to avoid removing app sentinel files.
+}
+
 # Remove old Google Chrome versions while keeping Current.
 clean_chrome_old_versions() {
     local -a app_paths=(