Precache wasm for offline rich text parser

[wsxiaolin]

Motivation

• Fix the runtime error where the rich-text parser's WASM could not be fetched offline by ensuring the .wasm asset is included in the PWA precache so the parser is available when the app is offline.

Description

• Add .wasm to the VitePWA injectManifest.globPatterns in vite.config.ts and include a short comment explaining why the WASM must be precached.

Testing

• Ran npm run build which completed successfully; verified the built service worker precache now references the wasm asset with rg -n "pltxt2htm.*wasm" dist/sw.js; and ran git diff --check which reported no problems.

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Codex Task