Add terminal-style scan log panel

scan_state now accumulates log_lines per switch result. The status
bar is replaced with a dark terminal panel showing a summary header
[done/total ✓ok ✗fail | now: hostname] and a scrolling per-switch
log with green/red colouring and timestamps.

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

scanner.py

@@ -21,6 +21,7 @@ scan_state = {
     "ok": 0,
     "fail": 0,
     "errors": [],
+    "log_lines": [],
     "last_scan": None,
     "dept_filter": None,   # None = all, "ELEC" or "GW" = dept-only
 }
@@ -56,6 +57,7 @@ def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
         "ok": 0,
         "fail": 0,
         "errors": [],
+        "log_lines": [],
         "dept_filter": dept,
     })
 
@@ -63,6 +65,8 @@ def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
     clear_links()  # Fresh start for links each scan
 
     def on_progress(done, total, ip, result):
+        from datetime import datetime
+        ts = datetime.now().strftime("%H:%M:%S")
         scan_state["done"] = done
         scan_state["total"] = total
         scan_state["current_ip"] = ip
@@ -70,6 +74,12 @@ def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
         if result["success"]:
             scan_state["ok"] += 1
             scan_state["current_hostname"] = result.get("hostname", ip)
+            vendor = result.get("vendor", "")
+            n = len(result.get("neighbors", []))
+            scan_state["log_lines"].append({
+                "ts": ts, "ok": True,
+                "text": f"✓  {result['hostname']} ({ip})  [{vendor}]  — {n} neighbor{'s' if n != 1 else ''}",
+            })
 
             upsert_switch(
                 chassis_id=result["chassis_id"],
@@ -100,9 +110,11 @@ def run_scan(dept: str = None, workers: int = 5, login_delay: int = 3):
                 )
         else:
             scan_state["fail"] += 1
-            scan_state["errors"].append({
-                "ip": ip,
-                "error": result.get("error", "Unknown error")
+            error = result.get("error", "Unknown error")
+            scan_state["errors"].append({"ip": ip, "error": error})
+            scan_state["log_lines"].append({
+                "ts": ts, "ok": False,
+                "text": f"✗  {ip}  — {error}",
             })
 
     scan_all_switches(switches, progress_callback=on_progress, max_workers=workers, login_delay=login_delay)