Add multimodal AI chat attachments

internal/server/web/static/workspace.js

@@ -84,7 +84,7 @@
     }
     live.forEach((t, i) => { t.el.style.width = Math.min(want[i], cap) + 'px'; });
   }
-  window.addEventListener('resize', () => fitTabs());
+  window.addEventListener('resize', () => { fitTabs(); placeFloat(); });
 
   function renderTab(t) {
     t.el.querySelector('.tab-title').textContent = tabTitle(t);
@@ -148,7 +148,9 @@
   }
   // With one tab and a file pane in the top right corner, the "+" joins
   // that pane's top bar: right of "Обновить", above "Удалить выбранное",
-  // a button of the same size. Otherwise it is back in the corner.
+  // a button of the same size. It is positioned in .area, not the scrolling
+  // .fpane-body, so it stays beside the path field while the file list scrolls.
+  // Otherwise it is back in the corner.
   function placeFloat() {
     const p = tabs.length === 1 ? tabs[0].panes.find(s => s.el.classList.contains('under-plus')) : null;
     const bars = p && /files$/.test(p.kind) ? p.el.querySelectorAll('.fm-bar') : [];