[BUG] Missing OpenJPEG WASM fallback file causing image decode failures

[skifli]

🐛 Bug Description

When processing PDFs with images, the OpenJPEG WASM module fails to initialize due to a missing fallback file (named 'nullopenjpeg_nowasm_fallback.js'), causing image decode failures across all pages.

📋 Steps to Reproduce

1. Install pdf-reader-mcp via npx or npm
2. Attempt to process a PDF containing images
3. Observe the OpenJPEG errors in the logs

✅ Expected Behavior

Images within PDFs should decode correctly or gracefully fall back to non-WASM/Javascript implementation.

❌ Actual Behavior

Images fail to decode with "JpxError: OpenJPEG failed to initialize" error.

📸 Screenshots / Logs

Apr 09 14:17:59 lyra npx[120832]: Warning: Bad value, for custom key "AAPL:Keywords", in Info: .
Apr 09 14:17:59 lyra npx[120832]: Warning: UnknownErrorException: Ensure that the `standardFontDataUrl` API parameter is provided.
Apr 09 14:17:59 lyra npx[120832]: Warning: JpxImage#instantiateWasm: UnknownErrorException: Ensure that the `wasmUrl` API parameter is provided.
Apr 09 14:17:59 lyra npx[120832]: Warning: JpxImage#getJsModule: Error [ERR_MODULE_NOT_FOUND]: Cannot find package 'nullopenjpeg_nowasm_fallback.js' imported from /home/ami/.npm/_npx/673e420c0bc15d5b/node_modules/pdfjs-dist/legacy/build/pdf.worker.mjs
Apr 09 14:17:59 lyra npx[120832]: Warning: Unable to decode image "img_p1_1": "JpxError: OpenJPEG failed to initialize".
Apr 09 14:18:00 lyra npx[120832]: Warning: Unable to decode image "img_p13_1": "JpxError: OpenJPEG failed to initialize".
Apr 09 14:18:10 lyra npx[120832]: Warning: Bad value, for custom key "AAPL:Keywords", in Info: .
Apr 09 14:18:10 lyra npx[120832]: Warning: UnknownErrorException: Ensure that the `standardFontDataUrl` API parameter is provided.

🖥️ Environment

Package Information:

• Package name: @sylphx/pdf-reader-mcp
• Package version: 2.3.0
• Installation method: npx

System Information:

• OS: NixOS 25.11 (Xantusia)
• Node.js version: v22.21.1
• npm version: 10.9.4

Additional Context:

• MCP Client: n/a (used as MCP server)

🔄 Reproducibility

• Always

🔍 Additional Context

The issue appears to be with pdfjs-dist not properly resolving the OpenJPEG WASM module path. The file path 'nullopenjpeg_nowasm_fallback.js' suggests a null prefix being incorrectly prepended to the filename.