Add secure 6h timeline with CSV merge and timestamped serial events

static/style.css

@@ -79,6 +79,12 @@ button:hover {
   min-height: 20px;
 }
 
+.hint {
+  color: #4b5968;
+  font-size: 14px;
+  min-height: 20px;
+}
+
 .terminal {
   height: 70vh;
   overflow-y: auto;
@@ -91,3 +97,95 @@ button:hover {
   font-family: "DejaVu Sans Mono", "Noto Sans Mono", monospace;
   white-space: pre-wrap;
 }
+
+.timeline-page {
+  max-width: 1280px;
+}
+
+.timeline-upload-row {
+  display: grid;
+  grid-template-columns: 1fr auto;
+  gap: 10px;
+  align-items: center;
+}
+
+.timeline-actions {
+  margin-top: 6px;
+}
+
+.download-links {
+  display: flex;
+  gap: 16px;
+  flex-wrap: wrap;
+  margin-top: 8px;
+}
+
+.timeline-grid {
+  display: grid;
+  grid-template-columns: 1fr 1fr;
+  gap: 16px;
+}
+
+.timeline-panel {
+  min-height: 70vh;
+}
+
+.timeline-terminal {
+  height: 60vh;
+}
+
+.timeline-table-wrap {
+  border: 1px solid #d0d7de;
+  border-radius: 8px;
+  overflow: auto;
+  max-height: 60vh;
+  background: #ffffff;
+}
+
+.timeline-table {
+  width: 100%;
+  border-collapse: collapse;
+  min-width: 640px;
+  font-size: 13px;
+}
+
+.timeline-table th,
+.timeline-table td {
+  border-bottom: 1px solid #e6ebf0;
+  border-right: 1px solid #e6ebf0;
+  padding: 6px 8px;
+  text-align: left;
+  white-space: nowrap;
+}
+
+.timeline-table th:last-child,
+.timeline-table td:last-child {
+  border-right: none;
+}
+
+.timeline-table thead th {
+  background: #f7f9fb;
+  position: sticky;
+  top: 0;
+  z-index: 1;
+}
+
+@media (max-width: 960px) {
+  .timeline-upload-row {
+    grid-template-columns: 1fr;
+  }
+
+  .timeline-grid {
+    grid-template-columns: 1fr;
+  }
+
+  .timeline-panel {
+    min-height: auto;
+  }
+
+  .timeline-terminal,
+  .timeline-table-wrap {
+    max-height: 50vh;
+    height: 50vh;
+  }
+}