refactor: Clarify slideshow timing and transitions in prompt

app.py

@@ -357,7 +357,7 @@ with gr.Blocks() as demo:
                         "./examples/cat5.jpeg",
                         "./examples/cat6.jpeg",
                     ],
-                    "Create a smooth slideshow where each image is shown for exactly 2 seconds. Apply a continuous subtle zoom-in effect on each image that starts at 100% scale and ends at 110% scale. Use smooth transitions between images. Match the total duration to the number of images multiplied by 2 seconds.",
+                    "Create a smooth slideshow where each individual image is displayed for exactly 2 seconds. Apply a continuous subtle zoom-in effect on each image that starts at 100% scale and ends at 110% scale during its 2-second display. Use smooth crossfade transitions between images. The total video duration should be exactly 12 seconds (6 images × 2 seconds each).",
                     0.7,
                     0.1,
                     "deepseek-ai/DeepSeek-V3",