Merge ticket/005-sharp-angular-timeline-spikes

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XFUNZwCvz3kcod3352ZR2o

webapp/src/components/LogTimeline.tsx

@@ -165,7 +165,7 @@ export function LogTimeline({
           {buckets.map((b) => (
             <div
               key={b.start_ms}
-              className="absolute bottom-0 min-w-[2px] rounded-t bg-accent/70"
+              className="absolute bottom-0 min-w-[2px] bg-accent/70"
               style={{
                 left: `${((b.start_ms - domainStart) / domainSpan) * 100}%`,
                 width: `${(bucketMs / domainSpan) * 100}%`,