refactor(js): dritte Refactoring-Iteration – weitere Duplikate eliminiert

Zusammengeführt/dedupliziert:
- renderMessages() nutzt jetzt _renderMessagesIntoFragment() statt eigenen switch/case
- addChoiceBubble() + addChoiceBubbleStatic() → _createChoiceBubble() Helper
- addErrorBubble() + addWarningBubble() → _addSystemBubble() Helper
- Chain-Meta-Erstellung (3x) → _createChainMetaDiv() Helper
- Agent-Picker-Setup (4x) → setupAgentPicker() Helper in session-page
- more-Click-Handler (2x) → initMoreButton() Helper in ui-helpers
- showLoginLinkModal() nutzt jetzt _createModal()
- showMessage() in server-settings → showToast()

Verwaiste Funktionen entfernt:
- addAssistantBubble(), addReviewBubbleStatic(), addChoiceBubbleStatic()
- addAttachmentIndicator(), addToolBoxStatic(), appendToolResult()
- serverSettingsMessage HTML-Element

Netto: -261 Zeilen

wwwroot/js/tool-ui.js

@@ -256,47 +256,4 @@ function finishToolBox(div, data) {
   scrollDown();
 }
 
-function addToolBoxStatic(name, input, result, isError, sources) {
-  const div = document.createElement('div');
-  div.className = 'tool-box';
-  div.dataset.toolName = name;
-  renderToolBoxContent(div, name, input, result, isError, sources);
-  chatEl().appendChild(div);
-  scrollDown();
-}
 
-function appendToolResult(result, isError) {
-  // Letzten tool-box im Chat finden und Result in die bereits vorhandene .tool-result-Div schreiben
-  const boxes = chatEl().querySelectorAll('.tool-box');
-  const lastBox = boxes[boxes.length - 1];
-  if (!lastBox) return;
-
-  // Wenn Diff vorhanden (edit_file/write_file) → kein Result anhängen
-  if (lastBox.querySelector('.tool-diff')) return;
-
-  const toolName = lastBox.dataset.toolName || '';
-  const isTodoWrite = toolName === 'todo_write';
-
-  if (isTodoWrite) {
-    // Vorhandene todo-list ersetzen oder neu erstellen
-    const existing = lastBox.querySelector('.todo-list');
-    if (existing) existing.remove();
-    if (result && !isError) {
-      const todoList = buildTodoList(result, isError);
-      lastBox.appendChild(todoList);
-    }
-    return;
-  }
-
-  const existing = lastBox.querySelector('.tool-result');
-  if (existing) {
-    existing.textContent = result || '';
-    if (isError) existing.classList.add('tool-error');
-  } else {
-    const resultDiv = document.createElement('div');
-    resultDiv.className = 'tool-result' + (isError ? ' tool-error' : '');
-    resultDiv.textContent = result || '';
-    resultDiv.hidden = true;
-    lastBox.appendChild(resultDiv);
-  }
-}