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/main.ts

@@ -6,13 +6,11 @@ import '@phosphor-icons/web/regular';
 import * as pdfjsLib from 'pdfjs-dist';
 import '../css/styles.css';
 import { formatShortcutDisplay, formatStars } from './utils/helpers.js';
-import { APP_VERSION } from '../version.js';
 import {
   initI18n,
   applyTranslations,
   rewriteLinks,
   injectLanguageSwitcher,
-  createLanguageSwitcher,
   t,
 } from './i18n/index.js';
 import {
@@ -501,7 +499,7 @@ const init = async () => {
       }
     });
 
-    dom.toolGrid.addEventListener('click', (e) => {
+    dom.toolGrid.addEventListener('click', () => {
       // All tools now use href and navigate directly - no modal handling needed
     });
   }
@@ -889,7 +887,7 @@ const init = async () => {
     });
   }
 
-  function getToolId(tool: any): string {
+  function getToolId(tool: { id?: string; href?: string }): string {
     if (tool.id) return tool.id;
     if (tool.href) {
       const match = tool.href.match(/\/([^/]+)\.html$/);