diff --git a/python/api/edit_work_dir_file.py b/python/api/edit_work_dir_file.py
index 379064295..a23e19b39 100644
--- a/python/api/edit_work_dir_file.py
+++ b/python/api/edit_work_dir_file.py
@@ -14,6 +14,13 @@ class EditWorkDirFile(ApiHandler):
     def get_methods(cls):
         return ["GET", "POST"]
 
+    def _extract_error_message(self, error_str: str) -> str:
+        """Extract user-friendly error message from exception string."""
+        for line in reversed(error_str.split('\n')):
+            if ': ' in line and ('Exception' in line or 'Error' in line):
+                return line.split(': ', 1)[1].strip()
+        return error_str.strip()
+
     async def process(self, input: Input, request: Request) -> Output:
         try:
             if request.method == "GET":
@@ -46,7 +53,9 @@ class EditWorkDirFile(ApiHandler):
 
             return {"ok": True}
         except Exception as e:
-            return {"error": str(e)}
+            # Extract clean error message from exception
+            # RPC calls may return full tracebacks in exception strings
+            return {"error": self._extract_error_message(str(e))}
 
 
 async def load_file(file_path: str) -> dict:
diff --git a/webui/components/modals/file-browser/file-browser.html b/webui/components/modals/file-browser/file-browser.html
index e46be6757..ff5e7babf 100644
--- a/webui/components/modals/file-browser/file-browser.html
+++ b/webui/components/modals/file-browser/file-browser.html
@@ -51,7 +51,7 @@
                 <template x-if="$store.fileBrowser.browser.entries.length">
                   <template x-for="file in $store.fileBrowser.sortFiles($store.fileBrowser.browser.entries)" :key="file.path">
                     <div class="file-item" :data-is-dir="file.is_dir">
-                      <div class="file-name" @click="file.is_dir ? $store.fileBrowser.navigateToFolder(file.path) : $store.fileBrowser.downloadFile(file)">
+                      <div class="file-name" @click="file.is_dir && $store.fileBrowser.navigateToFolder(file.path)">
                         <img :src="'/public/' + (file.type === 'unknown' ? 'file' : ($store.fileBrowser.isArchive(file.name) ? 'archive' : file.type)) + '.svg'" class="file-icon" :alt="file.type" />
                         <span x-text="file.name"></span>
                       </div>
@@ -91,7 +91,7 @@
                             <button
                               type="button"
                               class="dropdown-item"
-                              x-show="!file.is_dir"
+                              x-show="!file.is_dir && file.size <= 1048576"
                               @click="$store.fileBrowser.openFileEditor(file)"
                             >
                               <span class="material-symbols-outlined">file_open</span>
@@ -191,22 +191,24 @@
     }
 
     /* File Browser Styles */
-    .files-list,
-    .file-header {
+    .files-list {
       width: 100%;
       border-radius: 4px;
-      overflow: hidden;
+      /* Removed overflow: hidden to allow dropdown menus to be visible */
     }
 
     /* Header Styles */
     .file-header {
-    display: grid;
-    grid-template-columns: 2fr 0.6fr 1fr 160px;
-    background: var(--secondary-bg);
-    padding: 8px 0;
-    font-weight: bold;
-    border-bottom: 1px solid var(--border-color);
-    color: var(--color-primary);
+      width: 100%;
+      border-radius: 4px;
+      overflow: hidden;
+      display: grid;
+      grid-template-columns: 1.5fr 0.71fr 1.05fr 0.6fr;
+      background: var(--secondary-bg);
+      padding: 8px 0;
+      font-weight: bold;
+      border-bottom: 1px solid var(--border-color);
+      color: var(--color-primary);
     }
     .file-cell,
     .file-cell-size,
@@ -219,7 +221,7 @@
     /* File Item Styles */
     .file-item {
     display: grid;
-    grid-template-columns: 2fr 0.6fr 1fr 160px;
+    grid-template-columns: 1.5fr 0.7fr 1fr 0.6fr;
     align-items: center;
     padding: 8px 0;
     font-size: 0.875rem;
@@ -381,7 +383,9 @@
     }
     /* Responsive Design */
     @media (max-width: 768px) {
-    .file-header,
+    .file-header {
+      grid-template-columns: 1fr 0.52fr 120px;
+    }
     .file-item {
         grid-template-columns: 1fr 0.5fr 120px;
     }
diff --git a/webui/components/modals/file-editor/file-editor-store.js b/webui/components/modals/file-editor/file-editor-store.js
index 9508b355d..d8aff4b89 100644
--- a/webui/components/modals/file-editor/file-editor-store.js
+++ b/webui/components/modals/file-editor/file-editor-store.js
@@ -71,7 +71,8 @@ const model = {
       this.isEditLoading = false;
       this.scheduleEditorInit();
     } catch (error) {
-      const message = error?.message || "Failed to load file";
+      let message = error?.message || "Failed to load file";
+      message = this._extractErrorMessage(message);
       this.editError = message;
       this.isEditLoading = false;
       window.toastFrontendError(message, "File Edit Error");
@@ -197,6 +198,19 @@ const model = {
 
   // --- Helpers -------------------------------------------------------------
 
+  _extractErrorMessage(msg) {
+    if (typeof msg !== 'string') return msg;
+    // Extract clean error from traceback strings
+    const lines = msg.split('\n');
+    for (let i = lines.length - 1; i >= 0; i--) {
+      const line = lines[i].trim();
+      if (line.includes(': ') && /Exception|Error/.test(line)) {
+        return line.split(': ').slice(1).join(': ').trim();
+      }
+    }
+    return msg;
+  },
+
   resetEditState() {
     if (this.editor?.destroy) {
       this.editor.destroy();
diff --git a/webui/css/tables.css b/webui/css/tables.css
index 7d5e75fe8..d20fe818e 100644
--- a/webui/css/tables.css
+++ b/webui/css/tables.css
@@ -303,9 +303,6 @@
     padding: 2rem;
     color: var(--color-text);
     opacity: 0.8;
-    background: var(--color-panel);
-    border: 1px solid var(--color-border);
-    border-radius: 8px;
     margin: 1rem 0;
     display: grid;
     align-items: center;
diff --git a/webui/js/messages.js b/webui/js/messages.js
index 16c5e7bb3..d04826f4f 100644
--- a/webui/js/messages.js
+++ b/webui/js/messages.js
@@ -460,8 +460,6 @@ function drawStandaloneMessage({
     mainClass,
   });
 
-  // Collapsible with action buttons
-  setupCollapsible(messageDiv, ".step-action-buttons", false, actionButtons);
   // Collapsible with action buttons
   setupCollapsible(messageDiv, ".step-action-buttons", false, actionButtons);
 
@@ -526,6 +524,7 @@ export function _drawMessage({
   }
 
   // reapply scroll position or autoscroll
+  bodyDiv.dataset.scrollStabilization = "1";
   const scroller = new Scroller(bodyDiv, { smooth: !isMassRender() });
 
   // Handle KVPs incrementally
@@ -599,8 +598,10 @@ export function _drawMessage({
     }
   }
 
-  // reapply scroll position or autoscroll
-  scroller.reApplyScroll();
+  // reapply scroll position or reset for collapsed
+  messageDiv.classList.contains("expanded")
+    ? scroller.reApplyScroll()
+    : (bodyDiv.scrollTop = 0);
 
   return messageDiv;
 }
@@ -2065,25 +2066,24 @@ function setupCollapsible(messageDiv, containerSelector, initialExpanded, action
     btn.classList.toggle("show-more-btn", !exp);
   };
   syncBtn();
-  btn.onclick = () => { messageDiv.classList.toggle("expanded"); syncBtn(); };
+  btn.onclick = () => {
+    messageDiv.classList.toggle("expanded");
+    syncBtn();
+    messageDiv.classList.contains("expanded")
+      || (messageDiv.querySelector(".message-body").scrollTop = 0);
+  };
 
   actionButtons.filter(Boolean).forEach((b) => container.appendChild(b));
 
-  // Detect overflow after render (skip if already detected to avoid scroll disruption)
-  if (!messageDiv.classList.contains("has-overflow")) {
-    requestAnimationFrame(() => {
-      const body = messageDiv.querySelector(".message-body");
-      if (!body) return;
-      
-      // calculate max height without touching DOM (no scroll jitter)
-      const fontSize = parseFloat(getComputedStyle(body).fontSize || "16");
-      const maxHeight = messageDiv.classList.contains("expanded") 
-        ? fontSize * 15 
-        : body.clientHeight;
-        
-      messageDiv.classList.toggle("has-overflow", body.scrollHeight > maxHeight);
-    });
-  }
+  // Detect overflow after render
+  requestAnimationFrame(() => {
+    const body = messageDiv.querySelector(".message-body");
+    const fontSize = parseFloat(getComputedStyle(body || document.documentElement).fontSize || "16");
+    const maxHeight = messageDiv.classList.contains("expanded")
+      ? fontSize * 15
+      : (body?.clientHeight || 0);
+    messageDiv.classList.toggle("has-overflow", (body?.scrollHeight || 0) > maxHeight);
+  });
 }
 
 // returns true if this is the initial render of a chat eg. when reloading window, switching chat or catching up after a break