Add interactive plan node selection with media previews

- Click plan nodes (in DAG or list) to see details in side panel
- URL updates to #node-{id} for direct linking
- Node detail panel shows: type, status, inputs, output, config
- Inputs can be clicked to navigate to that node
- Inputs tab now shows media previews (image/video/audio)
- Steps include config data for display

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

app/routers/runs.py

@@ -133,6 +133,7 @@ async def get_run(
                                 "type": node.get("type", "EFFECT"),
                                 "status": "completed",  # Run completed
                                 "inputs": node.get("inputs", []),
+                                "config": node.get("config", {}),
                             })
                     elif isinstance(nodes, dict):
                         for node_id, node in nodes.items():
@@ -142,6 +143,7 @@ async def get_run(
                                 "type": node.get("type", "EFFECT"),
                                 "status": "completed",
                                 "inputs": node.get("inputs", []),
+                                "config": node.get("config", {}),
                             })
 
                     if steps:
@@ -174,6 +176,25 @@ async def get_run(
                 "media_type": media_type or "application/octet-stream",
             })
 
+        # Build inputs list with media types
+        run_inputs = []
+        if run.get("inputs"):
+            import mimetypes
+            cache_manager = get_cache_manager()
+            for i, input_hash in enumerate(run["inputs"]):
+                media_type = None
+                try:
+                    cache_path = cache_manager.get_path(input_hash)
+                    if cache_path and cache_path.exists():
+                        media_type, _ = mimetypes.guess_type(str(cache_path))
+                except Exception:
+                    pass
+                run_inputs.append({
+                    "hash": input_hash,
+                    "name": f"Input {i + 1}",
+                    "media_type": media_type,
+                })
+
         # Build DAG elements for visualization
         dag_elements = []
         if plan and plan.get("steps"):
@@ -209,6 +230,7 @@ async def get_run(
             run=run,
             plan=plan,
             artifacts=artifacts,
+            run_inputs=run_inputs,
             dag_elements=dag_elements,
             active_tab="runs",
         )