[Desktop] Application Mode: Bottom result thumbnail bar pushes right parameter panel off-screen

Title:
[Desktop] Application Mode: Bottom result thumbnail bar pushes the right parameter panel off-screen

Description:

In ComfyUI Desktop v1.0.38, the Application Mode UI has a layout issue where the bottom result thumbnail bar gradually expands horizontally as more images are generated.

After approximately 16–17 generated results, the thumbnail bar reaches the area occupied by the right-side parameter panel and pushes the parameter panel off-screen.

The issue appears to be caused by the bottom result thumbnail container continuing to expand instead of being constrained to the available width.

Steps to reproduce:

1. Open ComfyUI Desktop v1.0.38.
2. Switch to Application Mode.
3. Generate images continuously.
4. Keep generating results so that more thumbnails are added to the bottom result thumbnail bar.
5. After approximately 16–17 results, observe the right-side parameter panel.

Expected behavior:

The right-side parameter panel should remain fixed within the application window, regardless of how many generated-result thumbnails are added.

Actual behavior:

The bottom result thumbnail bar expands horizontally and eventually pushes the right-side parameter panel outside the visible window.

The issue can be reproduced by continuously generating enough results.

Screenshot:
Attached.

Start by reproducing the layout in ComfyUI Desktop v1.0.38 with Application Mode, continuously generating results until the bottom thumbnail bar expands. Trace the Application Mode layout and bottom result thumbnail bar components, then verify that the right parameter panel remains visible after adding more than 16–17 thumbnails.

Written by the indexing model from the issue text.