Observability front-end: a few last fixes (#3249)

* remove max height from the tree view

* Make it much harder for the SpanCardTimeline to get bumped to the right at deep nestings

Author: TehShrike

frontend/app/src/components/v1/agent-prism/SpanCard/SpanCard.tsx

@@ -69,7 +69,7 @@ const getContentWidth = ({
     width -= LAYOUT_CONSTANTS.CONNECTOR_WIDTH;
   }
 
-  return width - contentPadding;
+  return Math.max(width - contentPadding, 40);
 };
 
 const getGridTemplateColumns = ({
@@ -395,7 +395,6 @@ export const SpanCard: FC<SpanCardProps> = ({
                 )}
                 style={{
                   width: `min(${contentWidth}px, 100%)`,
-                  minWidth: 140,
                 }}
                 onClick={eventHandlers.handleToggleClick}
               >

frontend/app/src/pages/main/v1/workflow-runs-v1/$run/v2components/step-run-detail/observability/task-run-trace.tsx

@@ -48,7 +48,7 @@ export function TaskRunTrace({ spans }: { spans: [OtelSpan, ...OtelSpan[]] }) {
           </h4>
         </div>
       </div>
-      <div className="max-h-[500px] overflow-y-auto">
+      <div className="overflow-y-auto">
         <TreeView
           spanTree={traceSpanTree}
           expandedSpansIds={expandedSpansIds}