fix: normalize script matching to handle underscore vs hyphen differences

- Add normalizeId helper to compare local filenames with script slugs/names
- Include install_basenames from install_methods for robust matching
- Fix false 'Not Downloaded' status for PVE Host scripts like 'PVE LXC Execute Command'
- Update DownloadedScriptsTab and ScriptsGrid to use normalized comparisons
- Resolves issue where scripts with underscores in filenames (e.g., pbs_microcode.sh)
  weren't matching JSON slugs with hyphens (e.g., pbs-microcode)

src/types/script.ts

@@ -60,6 +60,8 @@ export interface ScriptCard {
   os?: string;
   version?: string;
   interface_port?: number | null;
+  // Optional: basenames of install scripts (without extension)
+  install_basenames?: string[];
 }
 
 export interface GitHubFile {