Fix scan log dismiss button visibility and truncate error messages

Dismiss button is now always visible with a bordered style instead of
hidden-until-JS. Netmiko error messages are truncated to first line
(120 chars) so verbose multi-line errors don't flood the log panel.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

index.html

@@ -419,14 +419,16 @@ var Xr=function(e){if(!(this instanceof Xr))return new Xr(e);this.id="Thenable/1
   .scan-log-dismiss {
     margin-left: auto;
     background: none;
-    border: none;
-    color: #484f58;
+    border: 1px solid #30363d;
+    border-radius: 4px;
+    color: #8b949e;
     cursor: pointer;
-    font-size: 14px;
-    padding: 0 4px;
-    line-height: 1;
+    font-size: 13px;
+    padding: 2px 7px;
+    line-height: 1.4;
+    flex-shrink: 0;
   }
-  .scan-log-dismiss:hover { color: #8b949e; }
+  .scan-log-dismiss:hover { color: #e6edf3; border-color: #8b949e; }
   .spinner {
     width: 14px; height: 14px;
     border: 2px solid rgba(79,142,247,.3);
@@ -598,7 +600,7 @@ var Xr=function(e){if(!(this instanceof Xr))return new Xr(e);this.id="Thenable/1
   <div class="scan-log-header">
     <div class="spinner" id="scanSpinner"></div>
     <span id="statusText" class="scan-log-summary">Scanning...</span>
-    <button class="scan-log-dismiss" id="scanLogDismiss" onclick="document.getElementById('statusBar').classList.remove('visible')" style="display:none">✕</button>
+    <button class="scan-log-dismiss" id="scanLogDismiss" onclick="document.getElementById('statusBar').classList.remove('visible')">✕</button>
   </div>
   <div class="scan-log-body" id="scanLogBody"></div>
 </div>
@@ -949,7 +951,6 @@ async function pollStatus() {
       progressWrap.classList.add('visible');
       statusBar.classList.add('visible');
       document.getElementById('scanSpinner').style.display = '';
-      document.getElementById('scanLogDismiss').style.display = 'none';
 
       const pct = s.total > 0 ? Math.round((s.done / s.total) * 100) : 0;
       progressBar.style.width = pct + '%';
@@ -989,18 +990,14 @@ async function pollStatus() {
         ).join('');
         logBody.scrollTop = logBody.scrollHeight;
 
+        spinner.style.display = 'none';
         if (s.fail > 0) {
-          // Keep panel open so user can read errors
-          spinner.style.display = 'none';
           statusText.innerHTML =
             `Scan complete &nbsp;—&nbsp; ` +
             `<span class="ok-count">✓ ${s.ok}</span>&nbsp;&nbsp;` +
             `<span class="fail-count">✗ ${s.fail} failed</span>`;
-          dismissBtn.style.display = 'block';
         } else {
           statusBar.classList.remove('visible');
-          spinner.style.display = '';
-          dismissBtn.style.display = 'none';
         }
       }
 

scanner.py

@@ -112,9 +112,10 @@ def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
             scan_state["fail"] += 1
             error = result.get("error", "Unknown error")
             scan_state["errors"].append({"ip": ip, "error": error})
+            error_short = error.splitlines()[0][:120]
             scan_state["log_lines"].append({
                 "ts": ts, "ok": False,
-                "text": f"✗  {ip}  — {error}",
+                "text": f"✗  {ip}  — {error_short}",
             })
 
     scan_all_switches(switches, progress_callback=on_progress, max_workers=workers, login_delay=login_delay)