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/compress-pdf-page.ts

@@ -85,7 +85,10 @@ async function performCondenseCompression(
     scrub: {
       metadata: customSettings?.removeMetadata ?? preset.scrub.metadata,
       thumbnails: customSettings?.removeThumbnails ?? preset.scrub.thumbnails,
-      xmlMetadata: (preset.scrub as any).xmlMetadata ?? false,
+      xmlMetadata:
+        'xmlMetadata' in preset.scrub
+          ? (preset.scrub as { xmlMetadata: boolean }).xmlMetadata
+          : false,
     },
     subsetFonts: customSettings?.subsetFonts ?? preset.subsetFonts,
     save: {
@@ -99,8 +102,8 @@ async function performCondenseCompression(
   try {
     const result = await pymupdf.compressPdf(fileBlob, options);
     return result;
-  } catch (error: any) {
-    const errorMessage = error?.message || String(error);
+  } catch (error: unknown) {
+    const errorMessage = error instanceof Error ? error.message : String(error);
     if (
       errorMessage.includes('PatternType') ||
       errorMessage.includes('pattern')
@@ -432,7 +435,7 @@ document.addEventListener('DOMContentLoaded', () => {
           usedMethod = 'Condense';
 
           // Check if fallback was used
-          if ((result as any).usedFallback) {
+          if ((result as { usedFallback?: boolean }).usedFallback) {
             usedMethod +=
               ' (without image optimization due to unsupported patterns)';
           }
@@ -551,12 +554,12 @@ document.addEventListener('DOMContentLoaded', () => {
           );
         }
       }
-    } catch (e: any) {
+    } catch (e: unknown) {
       hideLoader();
       console.error('[CompressPDF] Error:', e);
       showAlert(
         'Error',
-        `An error occurred during compression. Error: ${e.message}`
+        `An error occurred during compression. Error: ${e instanceof Error ? e.message : String(e)}`
       );
     }
   };