feat: Interactive Graph Partitioning Visualizer with Kernighan-Lin algorithm

Add docs/partitioning.html — an interactive balanced graph bisection tool:
- Canvas-based visualization with draggable nodes colored by partition (blue/orange)
- Kernighan-Lin (KL) algorithm with step-by-step animation and speed control
- Random bisection baseline for comparison
- Click nodes to manually swap between partitions
- 8 preset graphs: Petersen, Grid 4x4, Complete K8, Barbell, Hypercube Q4, Wheel W12, Random 15, Mesh 5x5
- Text input/export for custom adjacency lists
- Real-time metrics: cut size, balance ratio, KL pass count
- Algorithm comparison table (Random vs KL)
- Proactive insights: cut quality rating, balance assessment, convergence info
- Cut edges shown as dashed red lines, internal edges as solid gray

Usage: Open docs/partitioning.html in a browser, pick a preset or enter a graph, then run KL to minimize the edge cut.

Author: sauravbhattacharya001

docs/index.html

@@ -50,6 +50,7 @@ <h2>GraphVisual</h2>
         <a href="dominating-set.html" class="sidebar-link"><span class="icon">👑</span>Dominating Set</a>
         <a href="independent-set.html" class="sidebar-link"><span class="icon">🏝️</span>Independent Set</a>
         <a href="vertex-cover.html" class="sidebar-link"><span class="icon">🛡️</span>Vertex Cover</a>
+        <a href="partitioning.html" class="sidebar-link"><span class="icon">✂️</span>Graph Partitioning</a>
         <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>
@@ -165,6 +166,11 @@ <h4>Diffusion Simulator</h4>
         <h4>Independent Set Finder</h4>
         <p>Find maximum independent sets with greedy, exact backtracking, and complement-clique algorithms. Step-by-step animation with Gallai theorem verification.</p>
     </div>
+    <div class="card">
+        <div class="icon">✂️</div>
+        <h4>Graph Partitioning</h4>
+        <p>Balanced graph bisection with Kernighan-Lin optimization. Interactive node swapping, step-by-step animation, algorithm comparison, and proactive insights.</p>
+    </div>
 </div>
 
 <h2>Relationship Classification</h2>