Fix book page returning empty body due to malformed onclick attribute

html/template's context-aware parser was treating the backslash-escaped
quote in the inline onclick regex literal as an HTML attribute terminator,
causing template execution to produce an empty/broken output.

Move the summary paragraph-splitting logic into a named window.openSummary
function in the script block, and call it via a clean onclick=openSummary(this)
attribute with no inline regex literals.

scraper/internal/server/ui.go

@@ -1474,11 +1474,11 @@ const bookTmpl = `
         {{if .Meta.TotalChapters}}<span class="text-xs px-2 py-0.5 rounded-full bg-zinc-800 text-zinc-300">{{.Meta.TotalChapters}} ch total</span>{{end}}
         <span class="text-xs px-2 py-0.5 rounded-full bg-amber-900 text-amber-300">{{.TotalDownloaded}} downloaded</span>
       </div>
-      {{if .Meta.Summary}}
-      <p class="text-zinc-400 text-sm mt-3 line-clamp-3 cursor-zoom-in hover:text-zinc-300 transition-colors"
-       onclick="(function(t){var o=document.getElementById('summary-zoom-overlay');var c=document.getElementById('summary-zoom-text');c.innerHTML='';var paras=t.split(/\n+/).filter(function(s){return s.trim().length>0;});if(paras.length<=1){paras=t.split(/(?<=[.!?])\s{2,}|(?<=[.!?][\"'\u201d])\s+/).filter(function(s){return s.trim().length>0;});}paras.forEach(function(p){var el=document.createElement('p');el.textContent=p.trim();c.appendChild(el);});o.classList.remove('hidden');o.classList.add('flex');})(this.dataset.full)"
-         data-full="{{.Meta.Summary}}">{{.Meta.Summary}}</p>
-      {{end}}
+       {{if .Meta.Summary}}
+       <p class="text-zinc-400 text-sm mt-3 line-clamp-3 cursor-zoom-in hover:text-zinc-300 transition-colors"
+          onclick="openSummary(this)"
+          data-full="{{.Meta.Summary}}">{{.Meta.Summary}}</p>
+       {{end}}
     </div>
   </div>
 
@@ -1566,6 +1566,25 @@ const bookTmpl = `
 </div>
 
 <script>
+  window.openSummary = function(el) {
+    var t = el.dataset.full || '';
+    var o = document.getElementById('summary-zoom-overlay');
+    var c = document.getElementById('summary-zoom-text');
+    c.innerHTML = '';
+    var paras = t.split(/\n+/).filter(function(s) { return s.trim().length > 0; });
+    if (paras.length <= 1) {
+      paras = t.split(/(?<=[.!?][\u201d\u2019"']?)\s{2,}/).filter(function(s) { return s.trim().length > 0; });
+    }
+    if (paras.length <= 1) { paras = [t]; }
+    paras.forEach(function(p) {
+      var el = document.createElement('p');
+      el.textContent = p.trim();
+      c.appendChild(el);
+    });
+    o.classList.remove('hidden');
+    o.classList.add('flex');
+  };
+
 (function () {
   var SLUG = '{{.Slug}}';
   var LS_KEY = 'reading_progress';