Update tooltip labels to show model names directly

Changes:
- Changed "Model A:" to "RWKV:" in tooltip
- Changed "Model B:" to "Qwen:" in tooltip
- Updated CSS classes from .qwen/.rwkv to .model-a/.model-b
- Maintained color scheme: RWKV (#fcd34d), Qwen (#7dd3fc)

This makes the tooltip more intuitive by showing actual model names
instead of generic "Model A/B" labels.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

visualization/html_generator.py

@@ -580,12 +580,12 @@ def generate_comparison_html(
             color: #fca5a5;
             font-family: monospace;
         }}
-        #tooltip .qwen {{
-            color: #7dd3fc;
-        }}
-        #tooltip .rwkv {{
+        #tooltip .model-a {{
             color: #fcd34d;
         }}
+        #tooltip .model-b {{
+            color: #7dd3fc;
+        }}
         #tooltip .topk-section {{
             margin-top: 8px;
             padding-top: 8px;
@@ -810,8 +810,8 @@ def generate_comparison_html(
                     <div><span class="label">Compression A:</span> <span class="loss-a">${{compressionA || '(empty)'}}</span></div>
                     <div><span class="label">Compression B:</span> <span class="loss-b">${{compressionB || '(empty)'}}</span></div>
                     <hr style="border-color: #555; margin: 6px 0;">
-                    <div><span class="label">Model A:</span> <span class="model-a">${{modelA || '(empty)'}}</span></div>
-                    <div><span class="label">Model B:</span> <span class="model-b">${{modelB || '(empty)'}}</span></div>
+                    <div><span class="label">RWKV:</span> <span class="model-a">${{modelA || '(empty)'}}</span></div>
+                    <div><span class="label">Qwen:</span> <span class="model-b">${{modelB || '(empty)'}}</span></div>
                 `;
                 if (top5A || top5B) {{
                     tooltipHtml += '<div class="topk-section"><div class="topk-container">';