check phase commit:

[happyboy24]

PR: Display Agent Badges on Leaderboard

Closes: #200 (badges system integration), related to #190 (leaderboard)

Summary
Integrates the new badges system into the leaderboard UI, displaying up to 3 earned badge icons per agent row with tooltips and overflow handling. Badges are fetched in parallel with existing rank data to avoid request waterfalls.

Changes

API Layer

• Extended getLeaderboard() to fire GET /api/agents/{id}/badges for each agent in parallel with existing rank/XP fetch
• Added AgentBadgesResponse type mapping from issue X402 multi-chain: add transaction explorer link after settlement #200 schema
• Used Promise.all() over agent IDs so badge fetching doesn't block rank data

UI Components

• LeaderboardRow — added BadgeStrip sub-component
  • Renders up to 3 <BadgeIcon> components
  • Shows +N more overflow label when badges.length > 3
  • Tooltip on each icon: badge name + formatted earn date (MMM DD, YYYY)
• BadgeIcon — new presentational component
  • Accepts badge: { id, name, iconUrl, earnedAt }
  • Uses existing Tooltip primitive from @/components/ui
  • Accessible: aria-label + keyboard focus triggers tooltip
• DistrictLeaderboard — updated to include BadgeStrip in per-district rows (same layout rules as global view)

Behavior

Viewport	Layout
Desktop (≥768px)	Icons inline, right-aligned next to XP
Mobile (<768px)	Icons wrap below agent name; +N more truncates with ellipsis

Performance

• Parallel fetch: Promise.all([getRanks(), ...agents.map(a => getBadges(a.id))])
• No additional re-renders: badges memoized via useMemo keyed on agent ID
• Icons lazy-loaded via loading="lazy" on <img>

Screenshots
(attach before/after screenshots here)

Testing

• Unit: BadgeStrip renders ≤3 icons, shows overflow correctly
• Unit: Tooltip displays name + date on hover
• Integration: district leaderboard includes badge strip
• Mobile: verify no horizontal scroll on iPhone SE viewport
• API: confirm no waterfall in Network tab (parallel badge requests)

Checklist

• Fetched badges from /api/agents/{id}/badges
• Up to 3 icons per row in global leaderboard
• Tooltip with badge name + earned date
• +N more overflow label
• Mobile-safe layout (stack/truncate)
• Parallel fetch with rank data
• District leaderboard updated
• Tests added/updated
• Screenshots attached
• Design review sign-off

Related

• Issue X402 multi-chain: add transaction explorer link after settlement #200 — Badges system implementation
• PR Leaderboard — global and per district #190 — Leaderboard base (rank, XP, task count)

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Suggested PR title:

feat(leaderboard): display agent badges with tooltips and overflow

Quick review tip:
If you want to make the acceptance criteria super scannable for reviewers, you could also add this section right after Summary:

markdown
Acceptance Criteria Coverage

Criterion	Status	Location
≤3 badge icons per row	✅	BadgeStrip
Tooltip (name + date)	✅	BadgeIcon + Tooltip
+N more overflow	✅	BadgeStrip
Mobile-safe layout	✅	Responsive CSS
Parallel fetch	✅	getLeaderboard()
District leaderboard	✅	DistrictLeaderboard

closes #205 

[sonarqubecloud]

Quality Gate passed

Issues
11 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud