fix: properly initialize ImageMagick WASM by serving from public directory

The previous approach tried to load the WASM file from a CDN or node_modules,
which resulted in an empty buffer error. This fix copies the WASM file to the
public directory so it can be served alongside the static export.

Changes:
- Copy magick.wasm (16MB) to public/wasm/ directory
- Update wasmLoader.ts to initialize with '/wasm/magick.wasm' URL
- Initialize ImageMagick only once in loadImageMagick()
- Remove redundant initialization from imagemagickService.ts
- WASM file is now served from static assets in production

This ensures:
- WASM file is accessible at runtime
- Proper initialization before image conversions
- No "empty buffer" compilation errors
- Works in both dev and production (static export)

The 16MB WASM file includes the full ImageMagick library with all
image format support and processing capabilities.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/converters/imagemagickService.ts

@@ -25,12 +25,8 @@ export async function convertWithImageMagick(
 
     if (onProgress) onProgress(30);
 
-    // Import ImageMagick functions
-    const { ImageMagick, initializeImageMagick } = await import('@imagemagick/magick-wasm');
-
-    // Initialize ImageMagick with WASM URL from CDN
-    const wasmUrl = 'https://cdn.jsdelivr.net/npm/@imagemagick/magick-wasm@0.0.30/dist/magick.wasm';
-    await initializeImageMagick(wasmUrl);
+    // Import ImageMagick functions (already initialized by loadImageMagick)
+    const { ImageMagick } = await import('@imagemagick/magick-wasm');
 
     if (onProgress) onProgress(40);
 

lib/wasm/wasmLoader.ts

@@ -60,11 +60,18 @@ export async function loadImageMagick(): Promise<any> {
   }
 
   try {
+    const { initializeImageMagick } = await import('@imagemagick/magick-wasm');
+
+    // Initialize ImageMagick with WASM file from public directory
+    // In production (static export), this will be served from /wasm/magick.wasm
+    const wasmUrl = '/wasm/magick.wasm';
+    await initializeImageMagick(wasmUrl);
+
     const ImageMagick = await import('@imagemagick/magick-wasm');
 
     imagemagickInstance = ImageMagick;
     moduleState.imagemagick = true;
-    console.log('ImageMagick loaded successfully');
+    console.log('ImageMagick loaded and initialized successfully');
 
     return imagemagickInstance;
   } catch (error) {