Bug: Figure Size setting in Gradio UI has no effect on generated images

[noking-xdj]

Description

The "Figure Size" dropdown in the Gradio web UI (app.py) accepts user input but the selected value is never passed to the image generation pipeline. All generated images use a hardcoded image_size="1k" regardless of the Figure Size selection.

Steps to Reproduce

1. Open the Gradio UI (python app.py)
2. In Settings, change "Figure Size" to any value (e.g., "14-17cm")
3. Generate candidates
4. Observe that the output image resolution is always 1k

Root Cause

In app.py, run_generate() receives figure_size and stores it in a local dict:

params = {"figure_size": figure_size}

But params is never passed to process_parallel_candidates() or any downstream function. The variable is effectively dead code.

Meanwhile, in agents/visualizer_agent.py, image_size is hardcoded to "1k" in both the Gemini and OpenRouter image generation paths (lines 192 and 206):

"image_size": "1k",  # hardcoded, ignores UI setting

Suggested Fix

1. Pass figure_size through additional_info in create_sample_inputs()
2. In VisualizerAgent, read figure_size from data["additional_info"] and map it to an appropriate image_size value:

Figure Size	Suggested image_size
1-3cm, 4-6cm	1k
7-9cm, 10-13cm	2k
14-17cm	4k

Environment

• PaperBanana version: fed1812 (latest main)
• Gradio UI (app.py)