Refactor and enhance type safety across various modules

- Updated function parameters and return types in `page-preview.ts`, `pdf-decrypt.ts`, and `pymupdf-loader.ts` for improved type safety.
- Introduced type definitions for `CpdfInstance`, `PyMuPDFInstance`, and other related types to ensure better type checking.
- Enhanced error handling in `sanitize.ts` by creating a utility function for error messages.
- Removed unnecessary type assertions and improved type inference in `editor.ts`, `serialization.ts`, and `tools.test.ts`.
- Added type definitions for markdown-it plugins to improve compatibility and type safety.
- Enforced stricter TypeScript settings by enabling `noImplicitAny` in `tsconfig.json`.
- Cleaned up test files by refining type assertions and ensuring consistency in type usage.

src/js/logic/word-to-pdf-page.ts

@@ -1,9 +1,5 @@
 import { showLoader, hideLoader, showAlert } from '../ui.js';
-import {
-  downloadFile,
-  readFileAsArrayBuffer,
-  formatBytes,
-} from '../utils/helpers.js';
+import { downloadFile, formatBytes } from '../utils/helpers.js';
 import { state } from '../state.js';
 import { createIcons, icons } from 'lucide';
 import {
@@ -187,13 +183,16 @@ document.addEventListener('DOMContentLoaded', () => {
           () => resetState()
         );
       }
-    } catch (e: any) {
+    } catch (e: unknown) {
       console.error('[Word2PDF] ERROR:', e);
-      console.error('[Word2PDF] Error stack:', e.stack);
+      console.error(
+        '[Word2PDF] Error stack:',
+        e instanceof Error ? e.stack : ''
+      );
       hideLoader();
       showAlert(
         'Error',
-        `An error occurred during conversion. Error: ${e.message}`
+        `An error occurred during conversion. Error: ${e instanceof Error ? e.message : String(e)}`
       );
     }
   };