chain blocks: single-line layout, user message display, raw json fix, range label with time

wwwroot/style.css

@@ -84,7 +84,6 @@ header h1 { font-size: 1.1rem; font-weight: 600; color: var(--accent); }
 #range-label {
   font-size: 0.85rem;
   color: var(--muted);
-  font-family: monospace;
 }
 
 /* Chart */
@@ -186,12 +185,38 @@ header h1 { font-size: 1.1rem; font-weight: 600; color: var(--accent); }
 }
 
 .block-header {
-  padding: 12px 16px;
+  padding: 8px 16px;
   display: flex;
   align-items: center;
-  justify-content: space-between;
+  gap: 16px;
   cursor: pointer;
   transition: background 0.15s;
+  font-size: 0.8rem;
+}
+
+.block-date {
+  color: var(--muted);
+  white-space: nowrap;
+}
+
+.block-dur {
+  color: var(--muted);
+  font-family: monospace;
+  white-space: nowrap;
+  min-width: 50px;
+}
+
+.block-msg {
+  color: var(--text);
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  flex: 1;
+  min-width: 0;
+}
+
+.block-count {
+  white-space: nowrap;
 }
 
 .block-header:hover { background: #22263a; }