feat: new analysis button in Settings, fix overview tab hidden on load

frontend/vehicles.html

@@ -754,8 +754,14 @@
                     </button>
                 </div>
 
-
-
+                <!-- New Analysis Button (visible only after processing completes) -->
+                <div class="col-span-3 pb-4 hidden" id="new-analysis-wrap">
+                    <button onclick="startNewAnalysis()"
+                        class="w-full py-4 bg-white text-black font-bold text-sm rounded-full hover:bg-neutral-200 active:scale-[0.99] transition flex items-center justify-center gap-2">
+                        <i class="fa-solid fa-rotate-left text-xs"></i>
+                        <span>New Analysis</span>
+                    </button>
+                </div>
             </div>
         </div>
 
@@ -1100,6 +1106,16 @@
             if (wrap) wrap.style.display = 'none';
         }
 
+        function startNewAnalysis() {
+            sessionStorage.clear();
+            _params = null;
+            [congChart, doughChart, domChart, flowChart].forEach(c => {
+                c.data.labels = [];
+                c.data.datasets[0].data = [];
+                c.update();
+            });
+            window.location.href = '/';
+        }
         function updateBreakdown(classIn, classOut) {
             const container = document.getElementById('class-breakdown');
             const totalAll = sumValues(classIn) + sumValues(classOut);
@@ -1303,6 +1319,11 @@
                         infoRow('Real-time Ratio', d.speed_vs_realtime + 'x', 'Processing speed relative to video playback rate.');
 
                     if (d.video_id) loadReports(d.video_id);
+
+                    // Show New Analysis button in Settings
+                    const newWrap = document.getElementById('new-analysis-wrap');
+                    if (newWrap) newWrap.classList.remove('hidden');
+
                     return;
                 }