fix: frontend glitch on 0-indexed books

Author: mnemoo

backend/internal/bgloader/loader.go

@@ -477,16 +477,17 @@ func (bl *BackgroundLoader) loadModeInternalCancel(mode stakergs.ModeConfig, can
 			}
 		}
 
-		lineNum++
 		line := scanner.Bytes()
 		if len(line) == 0 {
+			lineNum++
 			continue
 		}
 
-		// Copy event data
+		// Copy event data (0-indexed to match CSV sim_id offset handling)
 		eventCopy := make(json.RawMessage, len(line))
 		copy(eventCopy, line)
 		events[lineNum] = eventCopy
+		lineNum++
 
 		// Send progress update
 		if lineNum%bl.progressInterval == 0 || time.Since(lastProgressUpdate) > 500*time.Millisecond {

frontend/src/lib/components/DistributionTable.svelte

@@ -29,6 +29,7 @@
 
 	// Sort buckets by range_end descending (biggest first)
 	let sortedBuckets = $derived(() => {
+		if (!buckets || buckets.length === 0) return [];
 		return [...buckets].sort((a, b) => b.range_end - a.range_end);
 	});
 
@@ -230,6 +231,7 @@
 
 	// Calculate total unique payouts from buckets
 	let totalPayouts = $derived(() => {
+		if (!buckets) return 0;
 		return buckets.reduce((sum, b) => sum + b.count, 0);
 	});
 </script>
@@ -256,7 +258,7 @@
 		{/if}
 	</div>
 
-	{#if buckets.length === 0}
+	{#if !buckets || buckets.length === 0}
 		<div class="py-8 text-center text-slate-500">No data</div>
 	{:else}
 		<div class="space-y-2">