feat: add --dry-run preview mode for cleanup and interactive d shortcut

README.md

@@ -23,6 +23,7 @@ curl -fsSL https://raw.githubusercontent.com/tw93/mole/main/install.sh | bash
 ```bash
 mole               # Interactive main menu
 mole clean         # Deep system cleanup
+mole clean --dry-run # Preview cleanup (no deletions)
 mole uninstall     # Interactive app uninstaller
 mole analyze [path]# Analyze disk space (default: home directory)
 mole --help        # Show help
@@ -117,6 +118,37 @@ $ mole analyze ~/Downloads
 
   Items (sorted by size):
 
+### Dry Run Preview
+
+Before actually deleting, you can preview what would be removed:
+
+```bash
+mole clean --dry-run
+```
+
+In interactive menu: select Clean System and press `d` instead of Enter.
+
+Sample output:
+```bash
+$ mole clean --dry-run
+
+🧪 Dry Run mode: showing what would be removed (no deletions).
+
+▶ System essentials
+  → User app cache (45.2GB, dry)
+  → User app logs (2.1GB, dry)
+  → Trash (12.3GB, dry)
+
+▶ Browser cleanup
+  → Chrome cache (8.4GB, dry)
+  → Safari cache (2.1GB, dry)
+
+====================================================================
+🧪 DRY RUN COMPLETE!
+💾 Potential reclaimable space: 72.00GB (no changes made) | Free space now: 223.5GB
+====================================================================
+```
+
   TYPE  SIZE        NAME
   ────────────────────────────────────────────────────────────────────────────────
   ▶ 📁   33.72GB      materials       ← Use arrow keys to select