fix: remove unsafe file cleanup in Library root and fix tests

- lib/clean: remove empty file cleanup in ~/Library to protect potential sentinel files
- tests: fix unbound variable error in clean_user_core.bats by initializing WHITELIST_PATTERNS

lib/clean/user.sh

@@ -32,23 +32,7 @@ clean_empty_library_items() {
         safe_clean "${empty_dirs[@]}" "Empty Library folders"
     fi
 
-    # Clean empty files in Library root (skipping .localized and other sentinels)
-    local -a empty_files=()
-    while IFS= read -r -d '' file; do
-        [[ -f "$file" ]] || continue
-        # Protect .localized and potential system sentinels
-        if [[ "$(basename "$file")" == ".localized" ]]; then
-            continue
-        fi
-        if is_path_whitelisted "$file"; then
-            continue
-        fi
-        empty_files+=("$file")
-    done < <(find "$HOME/Library" -mindepth 1 -maxdepth 1 -type f -empty -print0 2> /dev/null)
 
-    if [[ ${#empty_files[@]} -gt 0 ]]; then
-        safe_clean "${empty_files[@]}" "Empty Library files"
-    fi
 
     # 2. Clean empty subdirectories in Application Support and other key locations
     # Iteratively remove empty directories until no more are found