fix: Correct citation field name in Citation Distribution chart

- Change from 'citation_count' to 'citations' to match dashboard-data.js schema
- Fixes Citation Distribution chart showing all papers in 0-9 range
- Data uses 'citations' field, not 'citation_count'
- Chart will now correctly display citation distribution across ranges

Author: carlosdenner-videns

ISR-submission/dashboard/dashboard.html

@@ -1945,7 +1945,7 @@ <h4 style="margin-top: 0; margin-bottom: 15px; color: var(--primary);">📊 Filt
             const binCounts = new Array(bins.length - 1).fill(0);
 
             papers.forEach(p => {
-                const citations = p.citation_count || 0;
+                const citations = p.citations || 0;
                 for (let i = 0; i < bins.length - 1; i++) {
                     if (citations >= bins[i] && citations < bins[i + 1]) {
                         binCounts[i]++;