fix(test): add jszip as direct devDependency

export.ts uses await import('jszip'). Previously jszip was a
transitive of html-to-docx and not directly resolvable from src/.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pnpm-lock.yaml

@@ -461,6 +461,9 @@ importers:
       etherpad-cli-client:
         specifier: ^4.0.3
         version: 4.0.3
+      jszip:
+        specifier: ^3.10.1
+        version: 3.10.1
       nodeify:
         specifier: ^1.0.1
         version: 1.0.1

src/package.json

@@ -168,6 +168,7 @@
     "eslint": "^10.4.0",
     "eslint-config-etherpad": "^4.0.5",
     "etherpad-cli-client": "^4.0.3",
+    "jszip": "^3.10.1",
     "nodeify": "^1.0.1",
     "openapi-schema-validation": "^0.4.2",
     "set-cookie-parser": "^3.1.0",