Add Graph Link Predictor - autonomous link prediction with 4 algorithms

New interactive tool (docs/link-predictor.html) that predicts missing/future
edges using Common Neighbors, Jaccard Coefficient, Adamic-Adar Index, and
Preferential Attachment algorithms.

Features:
- 8 preset graphs (Social, Citation, Protein, Airline, etc.)
- Custom graph input via adjacency list text
- Force-directed canvas visualization with pan/zoom/drag
- Predicted edges shown as dashed lines with score-based intensity
- Top-K slider to control prediction count (5-50)
- Auto-Analyze mode: runs all 4 algorithms, ranks by consensus
- Proactive insights: most likely link, hub growth, cluster bridges
- Sortable results table with JSON/CSV export
- Hover tooltips on predicted edges showing per-algorithm scores

Usage: Open docs/link-predictor.html, select a preset or enter custom
edges, click 'Auto-Analyze' for full autonomous analysis.

Author: sauravbhattacharya001

docs/index.html

@@ -51,6 +51,7 @@ <h2>GraphVisual</h2>
         <a href="matching.html" class="sidebar-link"><span class="icon">💍</span>Max Matching</a>
         <a href="graph-advisor.html" class="sidebar-link"><span class="icon">🧠</span>Graph Advisor</a>
         <a href="graph-evolution.html" class="sidebar-link"><span class="icon">🧬</span>Evolution Sim</a>
+        <a href="link-predictor.html" class="sidebar-link"><span class="icon">🔮</span>Link Predictor</a>
     </div>
     <div class="sidebar-section">
         <div class="sidebar-section-title">Architecture</div>