fix: Review/Preparer/Finalizer-Bubbles im History-Rendering korrekt gruppiert

Nach dem Streaming werden alle .streamed Elemente entfernt und pollHistory()
rendert die Messages neu aus der DB. Bisher wurden Review-Agent-Messages dabei
als einzelne Bubbles dargestellt (jeder Text-Block + jeder Tool-Call separat),
statt als eine zusammenhängende Review-Bubble wie beim Streaming.

Lösung: _renderMessagesIntoFragment() erkennt jetzt Messages mit tag-Feld
(review/preparer/finalizer) und gruppiert aufeinanderfolgende Messages mit
demselben Tag. _renderReviewGroup() erzeugt daraus eine einzige Review-Bubble
mit Header (Icon + Agent-Name), Tool-Use-Indikatoren und zusammengefasstem
Text-Content - identisch zur Streaming-Darstellung.

Fallback für alte Messages ohne tag-Feld bleibt bestehen (_isReviewMessage).

wwwroot/js/history.js

@@ -161,6 +161,7 @@ function _mergeConsecutiveAssistantTexts(msgs) {
       const prev = result.length > 0 ? result[result.length - 1] : null;
       if (prev && prev.type === 'text' && prev.role === 'assistant'
           && prev.iteration === msg.iteration
+          && !msg.tag && !prev.tag
           && !_isReviewMessage(msg.content) && !_isReviewMessage(prev.content)) {
         prev.content = (prev.content || '') + ' ' + (msg.content || '');
         if (msg.id) prev.id = msg.id;
@@ -187,6 +188,18 @@ function _renderMessagesIntoFragment(fragment, msgs, imageMessageIds, opts) {
   const archived = opts && opts.archived;
   for (var _msgIdx = 0; _msgIdx < msgs.length; _msgIdx++) {
     const msg = msgs[_msgIdx];
+
+    // ── Grouped Review/Preparer/Finalizer Bubble (tag-based) ──
+    if (msg.tag && (msg.tag === 'review' || msg.tag === 'preparer' || msg.tag === 'finalizer')) {
+      // Collect all consecutive messages with the same tag
+      var tagGroup = [msg];
+      while (_msgIdx + 1 < msgs.length && msgs[_msgIdx + 1].tag === msg.tag) {
+        _msgIdx++;
+        tagGroup.push(msgs[_msgIdx]);
+      }
+      fragment.appendChild(_renderReviewGroup(tagGroup, archived));
+      continue;
+    }
     switch (msg.type) {
       case 'text': {
         const isReviewMsg = _isReviewMessage(msg.content);
@@ -266,6 +279,77 @@ function _renderMessagesIntoFragment(fragment, msgs, imageMessageIds, opts) {
   }
 }
 
+/**
+ * Renders a group of consecutive messages with the same tag (review/preparer/finalizer)
+ * into a single Review-Bubble matching the streaming UI structure.
+ */
+function _renderReviewGroup(tagGroup, archived) {
+  var tag = tagGroup[0].tag;
+  var bubble = document.createElement('div');
+  bubble.className = 'msg review-bubble' + (archived ? ' archived' : '');
+  if (tag === 'finalizer') bubble.classList.add('finalizer-bubble');
+  if (tag === 'preparer') bubble.classList.add('preparer-bubble');
+
+  // Extract agent name from first text message: "[Review: AgentName] text..."
+  var agentName = tag === 'preparer' ? 'Vorbereiter-Agent' : tag === 'finalizer' ? 'Finalizer-Agent' : 'Review-Agent';
+  var firstText = tagGroup.find(function(m) { return m.type === 'text' && m.role === 'assistant'; });
+  if (firstText) {
+    var nameMatch = firstText.content.match(/^\[(Review|Preparer|Finalizer): ([^\]]+)\]/);
+    if (nameMatch) agentName = nameMatch[2];
+  }
+
+  // Header
+  var header = document.createElement('div');
+  header.className = 'review-header';
+  if (tag === 'preparer') {
+    header.innerHTML = '<i class="fa fa-filter"></i> <strong>' + esc(agentName) + '</strong>';
+  } else if (tag === 'finalizer') {
+    header.innerHTML = '<i class="fa fa-flag-checkered"></i> <strong>' + esc(agentName) + '</strong>';
+  } else {
+    header.innerHTML = '<i class="fa fa-check-circle-o"></i> <strong>' + esc(agentName) + '</strong>';
+  }
+  bubble.appendChild(header);
+
+  // Content: collect text (strip prefix) and tool-use indicators
+  var textParts = [];
+  for (var i = 0; i < tagGroup.length; i++) {
+    var m = tagGroup[i];
+    if (m.type === 'text' && m.role === 'assistant') {
+      var text = m.content;
+      // Strip [Tag: AgentName] prefix
+      text = text.replace(/^\[(Review|Preparer|Finalizer): [^\]]+\]\s*/, '');
+      if (text) textParts.push(text);
+    } else if (m.type === 'tool_use') {
+      // Insert tool-use indicator
+      var toolDiv = document.createElement('div');
+      toolDiv.className = 'review-tool-use';
+      toolDiv.innerHTML = '<i class="fa fa-wrench"></i> <span class="tool-name">' + esc(m.toolName) + '</span>';
+      // Flush accumulated text before tool indicator
+      if (textParts.length > 0) {
+        var contentDiv = document.createElement('div');
+        contentDiv.className = 'review-content markdown';
+        contentDiv.innerHTML = renderMarkdown(textParts.join('\n\n'));
+        parseFluentEmojis(contentDiv);
+        bubble.appendChild(contentDiv);
+        textParts = [];
+      }
+      bubble.appendChild(toolDiv);
+    }
+    // tool_result and web_search_result are skipped (same as streaming)
+  }
+
+  // Flush remaining text
+  if (textParts.length > 0) {
+    var contentDiv = document.createElement('div');
+    contentDiv.className = 'review-content markdown';
+    contentDiv.innerHTML = renderMarkdown(textParts.join('\n\n'));
+    parseFluentEmojis(contentDiv);
+    bubble.appendChild(contentDiv);
+  }
+
+  return bubble;
+}
+
 function _isReviewMessage(content) {
   return content && (content.startsWith('[Review:') || content.startsWith('[Review-Feedback') || content.startsWith('[Finalizer:') || content.startsWith('[Preparer:'));
 }