Add image preview support: Krea-tag parsing with modal, file-explorer preview, skill output endpoint, increase execute timeout to 180s

- SkillEndpoint: GET /api/skills/{slug}/output/{filename} for skill output files
- WorkspaceEndpoint: GET /api/workspace/raw for raw file serving (images)
- File-Explorer: Image preview for png/jpg/gif/webp/svg/bmp/ico
- Chat UI: Parse [Krea: filename] tags into clickable chips with image modal
- ToolService: Increase execute timeout from 30s to 180s for long-running skills

wwwroot/js/file-explorer.js

@@ -204,6 +204,15 @@ async function feSelectFile(entry, itemEl) {
   // Vorherige Editor-Instanz aufräumen
   feDestroyEditor();
 
+  const imageExts = ['.png', '.jpg', '.jpeg', '.gif', '.webp', '.svg', '.bmp', '.ico'];
+  if (!entry.isText && imageExts.includes((entry.ext || '').toLowerCase())) {
+    const rawUrl = _feApiUrl('raw', `path=${encodeURIComponent(entry.path)}`);
+    main.innerHTML = `<div class="fe-image-preview"><img src="${rawUrl}" alt="${esc(entry.name)}" /></div>`;
+    footer.hidden = true;
+    _feState.selectedFile = null;
+    return;
+  }
+
   if (!entry.isText) {
     main.innerHTML = `<div class="fe-placeholder">${getFileIcon(entry.ext)} ${esc(entry.name)}<br><small>${formatSize(entry.size)} - Vorschau nicht verfügbar</small></div>`;
     footer.hidden = true;

wwwroot/js/ui.js

@@ -10,7 +10,15 @@ marked.setOptions({ breaks: true, gfm: true });
 
 function renderMarkdown(text) {
   if (!text) return '';
-  return marked.parse(text.trim());
+  var html = marked.parse(text.trim());
+  // [Krea: dateiname.png] → klickbarer Bild-Link
+  html = html.replace(/\[Krea:\s*([^\]]+)\]/g, function(match, filename) {
+    var fn = filename.trim();
+    var safeFn = esc(fn);
+    return '<span class="krea-ref-chip" data-filename="' + safeFn + '" title="Klicken für Vorschau">'
+      + '<i class="fa fa-picture-o"></i> ' + safeFn + '</span>';
+  });
+  return html;
 }
 
 function scrollDown() {
@@ -690,3 +698,64 @@ function removeArchiveLoadButton() {
   const btns = chatEl().querySelectorAll('.archive-load-btn:not(.older-messages-btn)');
   btns.forEach(b => b.remove());
 }
+
+// ── Krea Image Preview Modal ──
+
+function showKreaImageModal(filename) {
+  var url = '/api/skills/krea-api/output/' + encodeURIComponent(filename);
+
+  var overlay = document.createElement('div');
+  overlay.className = 'sp-overlay krea-overlay';
+
+  var modal = document.createElement('div');
+  modal.className = 'sp-modal krea-modal';
+
+  // Header
+  var header = document.createElement('div');
+  header.className = 'sp-header';
+  var title = document.createElement('span');
+  title.textContent = filename;
+  var closeBtn = document.createElement('button');
+  closeBtn.innerHTML = '<i class="fa fa-times"></i>';
+  closeBtn.className = 'sp-close icon-btn';
+  header.appendChild(title);
+  header.appendChild(closeBtn);
+
+  // Body
+  var body = document.createElement('div');
+  body.className = 'sp-body krea-modal-body';
+
+  var img = document.createElement('img');
+  img.src = url;
+  img.className = 'krea-modal-image';
+  img.alt = filename;
+  img.addEventListener('error', function() {
+    body.innerHTML = '<div class="sp-loading" style="color:var(--dangerous)">Bild konnte nicht geladen werden</div>';
+  });
+
+  body.appendChild(img);
+  modal.appendChild(header);
+  modal.appendChild(body);
+  overlay.appendChild(modal);
+  document.body.appendChild(overlay);
+
+  // Schließen
+  var close = function() { overlay.remove(); };
+  closeBtn.addEventListener('click', close);
+  overlay.addEventListener('click', function(e) {
+    if (e.target === overlay) close();
+  });
+  var onKey = function(e) {
+    if (e.key === 'Escape') { close(); document.removeEventListener('keydown', onKey); }
+  };
+  document.addEventListener('keydown', onKey);
+}
+
+// Event-Delegation für Krea-Chips im Chat
+document.addEventListener('click', function(e) {
+  var chip = e.target.closest('.krea-ref-chip');
+  if (chip) {
+    var filename = chip.dataset.filename;
+    if (filename) showKreaImageModal(filename);
+  }
+});