Fix chat stream recovery and PDF library indexing (#468)

static/js/chat.js

@@ -512,6 +512,9 @@ import createResearchSynapse from './researchSynapse.js';
     let timedOut = false;
     let processingProbeTimer = null;
     let processingProbeAbort = null;
+    let _renderStream = () => {};
+    let _cancelThinkingTimer = () => {};
+    let _removeThinkingSpinner = () => {};
     const clearProcessingProbe = () => {
       if (processingProbeTimer) {
         clearTimeout(processingProbeTimer);
@@ -986,13 +989,13 @@ import createResearchSynapse from './researchSynapse.js';
       }
       const esc = uiModule.esc;
       // Remove thinking spinner helper
-      function _removeThinkingSpinner() {
+      _removeThinkingSpinner = () => {
         const el = document.querySelector('.agent-thinking-dots');
         if (el) {
           if (el._spinner) el._spinner.destroy();
           el.remove();
         }
-      }
+      };
 
       // Tool-aware thinking spinner
       let _lastToolName = '';
@@ -1056,9 +1059,9 @@ import createResearchSynapse from './researchSynapse.js';
           }
         }, 400);
       }
-      function _cancelThinkingTimer() {
+      _cancelThinkingTimer = () => {
         if (_textPauseTimer) { clearTimeout(_textPauseTimer); _textPauseTimer = null; }
-      }
+      };
 
       // Document streaming state (text-fence detection)
       let _docFenceOpened = false;
@@ -1085,7 +1088,7 @@ import createResearchSynapse from './researchSynapse.js';
       }
 
       // Direct render helper for streaming text
-      function _renderStream() {
+      _renderStream = () => {
         let dt = stripToolBlocks(roundText);
         const bodyEl = roundHolder.querySelector('.body');
         const contentEl = _ensureStreamLayout(bodyEl);
@@ -1184,7 +1187,7 @@ import createResearchSynapse from './researchSynapse.js';
         contentEl._prevTextLen = contentEl.textContent.length;
         if (window.hljs) contentEl.querySelectorAll('pre code').forEach((b) => window.hljs.highlightElement(b));
         uiModule.scrollHistory();
-      }
+      };
 
       // Walk text nodes, skip past `prevLen` characters of old text,
       // wrap everything after that in <span class="token-new"> for fade-in