fix: revert to single-segment sort/labels for stacked charts

Use underscore separator in RSS labels instead of slash, so the
existing .pop() logic works for all stacked charts without breaking
timing component labels.

Author: johnathan79717

bench/index.html

@@ -788,23 +788,18 @@
               "#2471a3", "#a93226", "#229954", "#d4ac0d", "#4ae24a",
             ];
 
-            // Sort: put total_ms first (thicker line), then rest by last 2 segments
-            // (e.g. "06_EcdsaRAccount:entrypoint/0_alloc") so circuit index sorts first
+            // Sort: put total_ms first (thicker line), then rest alphabetically
             const sorted = [...stackedItems].sort((a, b) => {
-              const aParts = a.fullKey.split("/");
-              const bParts = b.fullKey.split("/");
-              const aName = aParts.length >= 2 ? aParts.slice(-2).join("/") : aParts.pop();
-              const bName = bParts.length >= 2 ? bParts.slice(-2).join("/") : bParts.pop();
-              if (aName.endsWith("total_ms")) return -1;
-              if (bName.endsWith("total_ms")) return 1;
+              const aName = a.fullKey.split("/").pop();
+              const bName = b.fullKey.split("/").pop();
+              if (aName === "total_ms") return -1;
+              if (bName === "total_ms") return 1;
               return aName.localeCompare(bName);
             });
 
             const datasets = sorted.map((item, i) => {
               const color = colors[i % colors.length];
-              // Use last 2 segments for labels like "06_EcdsaRAccount:entrypoint/after_accumulate"
-              const parts = item.fullKey.split("/");
-              const metricName = parts.length >= 2 ? parts.slice(-2).join("/") : parts.pop();
+              const metricName = item.fullKey.split("/").pop();
               const isTotal = metricName.endsWith("total_ms");
               const valueMap = new Map();
               item.benches.forEach((entry) => {