Reduce default GPU duration for Fast mode from 30s to 15s

Fast mode uses lower resolution, fewer steps, and no text encoder
offload, so 30s of reserved ZeroGPU time was more than actually needed.

Closes #15

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

app.py

@@ -681,7 +681,7 @@ with gr.Blocks() as demo:
     guidance_scale = gr.Slider(minimum=1.0, maximum=10.0, step=0.1, value=1.0, elem_id="gradio-guidance", elem_classes="hidden-input", container=False)
     steps = gr.Slider(minimum=1, maximum=50, step=1, value=3, elem_id="gradio-steps", elem_classes="hidden-input", container=False)
     mode = gr.Textbox(value="fast", elem_id="gradio-mode", elem_classes="hidden-input", container=False)
-    gpu_duration = gr.Slider(minimum=10, maximum=120, step=5, value=30, elem_id="gradio-gpu-duration", elem_classes="hidden-input", container=False)
+    gpu_duration = gr.Slider(minimum=10, maximum=120, step=5, value=15, elem_id="gradio-gpu-duration", elem_classes="hidden-input", container=False)
     result = gr.Image(elem_id="gradio-result", elem_classes="hidden-input", container=False, format="png")
 
     example_idx = gr.Textbox(value="", elem_id="example-idx-input", elem_classes="hidden-input", container=False)

static/mode_toggle.js

@@ -1,6 +1,6 @@
 () => {
 window.__selectedMode = 'fast';
-var MODE_GPU_DURATION = { fast: 30, high_detail: 60 };
+var MODE_GPU_DURATION = { fast: 15, high_detail: 60 };
 var MODE_STEPS = { fast: 3, high_detail: 4 };
 
 function applyModeSliderDefault(sliderId, valueMap, mode) {