Fix observer reports: charts, filtering, project preview, dashboard stats

- Rewrite diversity metrics: horizontal bar charts for ocean issues and
  geographic distribution (replaces unreadable vertical/donut charts)
- Rewrite juror score heatmap: expandable table with score distribution
- Rewrite juror consistency: horizontal bar visual with juror names
- Merge filtering tabs into single screening view with per-project
  AI reasoning and expandable rows
- Add project preview dialog for juror performance table
- Fix status breakdown for evaluation rounds (Fully/Partially/Not Reviewed)
- Show active round name instead of count on observer dashboard
- Move Global tab to last position, default to first round-specific tab
- Add 4-card stats layout for evaluation with reviews/project ratio
- Fix oceanIssue field (singular) and remove non-existent aiSummary

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/observer/observer-dashboard-content.tsx

@@ -210,14 +210,16 @@ export function ObserverDashboardContent({ userName }: { userName?: string }) {
           <div className="grid grid-cols-3 md:grid-cols-6 divide-x divide-border">
             {[
               { value: stats.projectCount, label: 'Projects' },
-              { value: stats.activeRoundCount, label: 'Active Rounds' },
+              { value: stats.activeRoundName ?? `${stats.activeRoundCount} Active`, label: 'Active Round', isText: !!stats.activeRoundName },
               { value: avgScore, label: 'Avg Score' },
               { value: `${stats.completionRate}%`, label: 'Completion' },
               { value: stats.jurorCount, label: 'Jurors' },
               { value: countryCount, label: 'Countries' },
             ].map((stat) => (
               <div key={stat.label} className="px-4 py-3.5 text-center">
-                <p className="text-xl font-semibold tabular-nums leading-tight">{stat.value}</p>
+                <p className={`font-semibold leading-tight ${
+                  'isText' in stat && stat.isText ? 'text-sm truncate' : 'text-xl tabular-nums'
+                }`}>{stat.value}</p>
                 <p className="text-[11px] text-muted-foreground mt-0.5">{stat.label}</p>
               </div>
             ))}