Add Training Loss section with dark/light theme GIF support

Co-authored-by: anxiangsir <31175974+anxiangsir@users.noreply.github.com>

Author: Copilot

README.md

@@ -73,6 +73,16 @@ The visualization below demonstrates our complete video processing pipeline. The
 2. **Avoid direct supervision from existing models** - Indirect usage is preferred over direct distillation, which may limit scaling capabilities
 3. **Progressive training when resources are limited** - Start with low resolution/frame rate, then gradually fine-tune to higher settings (ref: CLIPA)
 
+### Training Loss
+
+<p align="center">
+  <picture>
+    <source media="(prefers-color-scheme: dark)" srcset="https://raw.githubusercontent.com/anxiangsir/asset/main/OneVision/loss_github_dark.gif">
+    <source media="(prefers-color-scheme: light)" srcset="https://raw.githubusercontent.com/anxiangsir/asset/main/OneVision/loss_github_light.gif">
+    <img alt="Training Loss Visualization" src="https://raw.githubusercontent.com/anxiangsir/asset/main/OneVision/loss_github_light.gif" width="800" style="max-width: 100%;">
+  </picture>
+</p>
+
 ---
 
 ### Attentive Probe Results