feat: Implement empty file cleanup in ~/Library root (#234)

- Add logic to remove 0-byte files in ~/Library (maxdepth 1)
- Explicitly protect .localized files to preserve Finder localization
- Respect global whitelist patterns

lib/clean/user.sh

@@ -22,7 +22,7 @@ clean_empty_library_items() {
         return 0
     fi
 
-    # 1. Clean top-level empty directories in Library
+    # 1. Clean top-level empty directories and files in Library
     local -a empty_dirs=()
     while IFS= read -r -d '' dir; do
         [[ -d "$dir" ]] && empty_dirs+=("$dir")
@@ -32,6 +32,24 @@ 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
     local -a key_locations=(