add tblr_split checkbox to UI

Addresses user request in HF Space discussion #3 — left and right
limbs were glued together in the default output. Checkbox defaults
to off to preserve existing behavior.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app.py

@@ -92,7 +92,7 @@ def _collect_layer_gallery(saved_dir):
 
 
 @spaces.GPU(duration=120)
-def inference(image: Image.Image, resolution: int = 768, seed: int = 42):
+def inference(image: Image.Image, resolution: int = 768, seed: int = 42, tblr_split: bool = False):
     t_start = time.time()
     if image is None:
         raise gr.Error("Please upload an image.")
@@ -133,7 +133,7 @@ def inference(image: Image.Image, resolution: int = 768, seed: int = 42):
 
         t0 = time.time()
         _log("Running PSD assembly...")
-        further_extr(saved, rotate=False, save_to_psd=True, tblr_split=False)
+        further_extr(saved, rotate=False, save_to_psd=True, tblr_split=tblr_split)
         _log(f"PSD assembly done ({time.time() - t0:.1f}s)")
 
         psd_path = saved + ".psd"
@@ -176,6 +176,11 @@ with gr.Blocks(title="See-through: Layer Decomposition") as demo:
                 info="768 recommended for ZeroGPU free tier. Higher resolutions may timeout or use up your daily quota quickly.",
             )
             seed = gr.Slider(minimum=0, maximum=9999, value=42, step=1, label="Seed")
+            tblr_split = gr.Checkbox(
+                value=False,
+                label="Split left/right arms & legs",
+                info="Separate left and right limbs into individual layers. Useful if the default output glues them together.",
+            )
             run_btn = gr.Button("Run", variant="primary")
         with gr.Column(scale=2):
             psd_output = gr.File(label="Download layered PSD")
@@ -183,12 +188,12 @@ with gr.Blocks(title="See-through: Layer Decomposition") as demo:
 
     run_btn.click(
         fn=inference,
-        inputs=[input_image, resolution, seed],
+        inputs=[input_image, resolution, seed, tblr_split],
         outputs=[psd_output, gallery_output],
     )
     gr.Examples(
-        examples=[["common/assets/test_image.png", 768, 42]],
-        inputs=[input_image, resolution, seed],
+        examples=[["common/assets/test_image.png", 768, 42, False]],
+        inputs=[input_image, resolution, seed, tblr_split],
     )
 
 if __name__ == "__main__":