perf(tools): vendor jszip + docx-preview for archive/transmittal/classifier

Same pattern as the browse fix. archive, transmittal, classifier
previously CDN-loaded jszip + docx-preview on first preview of a
.zip / .docx file via shared/preview-lib.js's loadLibrary helper.
That meant each first-preview blocked on a CDN round-trip + parse,
and broke entirely under restrictive networks or CSPs.

Vendor both libs under shared/vendor/ and concat them at the top of
each tool's build, ahead of init.js. window.JSZip + window.docx are
now defined immediately on page load. Drop the redundant loadLibrary
calls (and classifier's stray <script src="cdn..."> tag in the
template, plus archive's bespoke loadJSZip helper in export.js).

xlsx (SheetJS) intentionally stays CDN-loaded — at ~900 KB it's too
large to inline, and only fires on .xlsx preview which is a rarer
path.

Bundle size impact (uncompressed):
  archive:     304 KB → 476 KB  (+172 KB)
  transmittal: 449 KB → 621 KB  (+172 KB)
  classifier:  252 KB → 424 KB  (+172 KB)

With the gzip middleware (~75% reduction on HTML) and ETag-cached
revalidation now in place, the wire-size delta is ~40 KB per tool
on the first load and 0 on every subsequent load until redeploy.

archive/build.sh

@@ -27,8 +27,14 @@ concat_files \
   "css/print.css" \
   > "$css_temp"
 
-# JavaScript files to concatenate in order
+# JavaScript files to concatenate in order. Vendored libraries first
+# (jszip, docx-preview) so window.JSZip + window.docx are defined before
+# any tool code runs — replaces the previous CDN loadLibrary() calls in
+# table.js + export.js. xlsx is intentionally still CDN-loaded on demand
+# (~900 KB; too large to inline).
 concat_files \
+  "../shared/vendor/jszip.min.js" \
+  "../shared/vendor/docx-preview.min.js" \
   "../shared/zddc.js" \
   "../shared/hash.js" \
   "../shared/theme.js" \

archive/js/export.js

@@ -53,10 +53,12 @@
             return;
         }
     
-        // Check if JSZip is loaded
+        // JSZip is vendored (concat'd by build.sh), so window.JSZip is
+        // already defined. Defensive check in case a future refactor
+        // reorders things.
         if (typeof JSZip === 'undefined') {
-            // Dynamically load JSZip
+            alert('JSZip library not bundled — rebuild archive with shared/vendor/jszip.min.js');
-            await loadJSZip();
+            return;
         }
 
         const zip = new JSZip();
@@ -123,17 +125,6 @@
         }
     }
 
-    // Load JSZip library dynamically
-    function loadJSZip() {
-        return new Promise((resolve, reject) => {
-            const script = document.createElement('script');
-            script.src = 'https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js';
-            script.onload = resolve;
-            script.onerror = reject;
-            document.head.appendChild(script);
-        });
-    }
-
     // Show progress indicator
     function showProgress(message, current, total) {
         let progressDiv = document.getElementById('progressIndicator');
@@ -260,7 +251,6 @@
         rowsToCSV,
         exportCSV,
         downloadSelected,
-        loadJSZip,
         showProgress,
         hideProgress,
         downloadFile,

archive/js/table.js

@@ -609,9 +609,9 @@
         if (!container) return;
         
         try {
-            await loadLibrary('https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js');
+            // jszip + docx-preview are vendored (concatenated by build.sh
-            await loadLibrary('https://cdn.jsdelivr.net/npm/docx-preview@latest/dist/docx-preview.min.js');
+            // ahead of every tool module), so window.JSZip and window.docx
-            
+            // are already defined here.
             const arrayBuffer = await (file.handle
                 ? file.handle.getFile().then(f => f.arrayBuffer())
                 : fetch(file.url).then(r => r.arrayBuffer()));

classifier/build.sh

@@ -25,8 +25,14 @@ concat_files \
   "css/spreadsheet.css" \
   > "$css_temp"
 
-# JavaScript files to concatenate in order
+# JavaScript files to concatenate in order. Vendored libraries first
+# (jszip, docx-preview) so window.JSZip + window.docx are defined before
+# any tool code runs. Replaces the previous <script src="cdn..."> tag in
+# template.html plus the loadLibrary CDN calls in preview.js. xlsx stays
+# CDN-loaded on demand (~900 KB; too large to inline).
 concat_files \
+  "../shared/vendor/jszip.min.js" \
+  "../shared/vendor/docx-preview.min.js" \
   "../shared/zddc.js" \
   "../shared/hash.js" \
   "../shared/theme.js" \

classifier/js/preview.js

@@ -383,9 +383,7 @@
         if (!container) return;
         
         try {
-            await loadLibrary('https://cdn.jsdelivr.net/npm/jszip@3/dist/jszip.min.js');
+            // jszip + docx-preview vendored by build.sh — already in scope.
-            await loadLibrary('https://cdn.jsdelivr.net/npm/docx-preview@latest/dist/docx-preview.min.js');
-            
             const blob = await getFileBlob(file);
             const arrayBuffer = await blob.arrayBuffer();
 

classifier/template.html

@@ -5,7 +5,6 @@
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
     <title>ZDDC Classifier</title>
     <link rel="icon" type="image/svg+xml" href="{{FAVICON}}">
-    <script src="https://cdnjs.cloudflare.com/ajax/libs/jszip/3.10.1/jszip.min.js"></script>
     <style>
         {{CSS_PLACEHOLDER}}
     </style>

transmittal/build.sh

@@ -36,8 +36,13 @@ concat_files \
   "css/print.css" \
   > "$css_temp"
 
-# JavaScript files to concatenate in order
+# JavaScript files to concatenate in order. Vendored libraries first
+# (jszip, docx-preview) so window.JSZip + window.docx are defined before
+# any tool code runs — replaces the previous CDN loadLibrary() calls
+# scattered through files-preview.js. xlsx stays CDN-loaded on demand.
 concat_files \
+  "../shared/vendor/jszip.min.js" \
+  "../shared/vendor/docx-preview.min.js" \
   "../shared/zddc.js" \
   "../shared/hash.js" \
   "../shared/theme.js" \

transmittal/js/files-preview.js

@@ -200,8 +200,7 @@
             return;
         }
         try {
-            await loadLibrary('https://cdn.jsdelivr.net/npm/jszip@3/dist/jszip.min.js');
+            // jszip + docx-preview vendored by build.sh — already in scope.
-            await loadLibrary('https://cdn.jsdelivr.net/npm/docx-preview@latest/dist/docx-preview.min.js');
             var arrayBuffer = await getFileArrayBuffer(file);
             container.innerHTML = '';
             await window.docx.renderAsync(arrayBuffer, container);
@@ -474,7 +473,7 @@
                 }
                 try {
                     updatePreviewStatus('Loading ZIP...');
-                    await loadLibrary('https://cdn.jsdelivr.net/npm/jszip@3/dist/jszip.min.js');
+                    // JSZip vendored by build.sh — already in scope.
                     var arrayBuffer = await zipFile.arrayBuffer();
                     var zip = await JSZip.loadAsync(arrayBuffer);
                     var sourceEntries = [];