Add validation: Start must be < End, default End=30

- Validate that Start < End (strictly less, not equal)
- Show error message if validation fails
- Change default End value from 50 to 30

app.py

@@ -70,7 +70,7 @@ def get_routed_steps(total_steps: int, strategy: str, params: dict) -> set:
 
     elif strategy == "Replace part of trajectory":
         mode = params.get("mode", "Percentages")
-        start, end = parse_start_end(params.get("start", 0), params.get("end", 50), total_steps, mode)
+        start, end = parse_start_end(params.get("start", 0), params.get("end", 30), total_steps, mode)
         routed = set(range(start, min(end, total_steps)))
 
     return routed
@@ -1313,7 +1313,7 @@ def build_app():
                                 )
                                 with gr.Row():
                                     start_step_1 = gr.Number(label="Start", value=0, minimum=0, precision=0, interactive=True)
-                                    end_step_1 = gr.Number(label="End", value=50, minimum=0, precision=0, interactive=True)
+                                    end_step_1 = gr.Number(label="End", value=30, minimum=0, precision=0, interactive=True)
 
                         add_model_2_btn = gr.Button("+ Add another model", size="sm", visible=False)
 
@@ -1349,7 +1349,7 @@ def build_app():
                                     )
                                     with gr.Row():
                                         start_step_2 = gr.Number(label="Start", value=0, minimum=0, precision=0, interactive=True)
-                                        end_step_2 = gr.Number(label="End", value=50, minimum=0, precision=0, interactive=True)
+                                        end_step_2 = gr.Number(label="End", value=30, minimum=0, precision=0, interactive=True)
 
                             add_model_3_btn = gr.Button("+ Add another model", size="sm", visible=False)
 
@@ -1385,7 +1385,7 @@ def build_app():
                                     )
                                     with gr.Row():
                                         start_step_3 = gr.Number(label="Start", value=0, minimum=0, precision=0, interactive=True)
-                                        end_step_3 = gr.Number(label="End", value=50, minimum=0, precision=0, interactive=True)
+                                        end_step_3 = gr.Number(label="End", value=30, minimum=0, precision=0, interactive=True)
 
                     gr.Markdown("---")
                     route_btn = gr.Button("🚀 Let's ROUTE!!", variant="primary", size="lg", interactive=False)
@@ -1587,6 +1587,13 @@ def build_app():
                 strategy_params["mode"] = part_mode_1_val
                 strategy_params["start"] = start_1_val
                 strategy_params["end"] = end_1_val
+                if start_1_val >= end_1_val:
+                    yield (
+                        gr.update(visible=True, value="❌ Start must be less than End"),
+                        gr.update(visible=False),
+                        None, None,
+                    )
+                    return
 
             total_base_tokens = {"uncached_input": 0, "cache_read": 0, "cache_creation": 0, "completion": 0}
             total_routing_tokens = {"uncached_input": 0, "cache_read": 0, "cache_creation": 0, "completion": 0}