Fix plan node detail to generate plan from recipe if not cached

- Add load_plan_for_run_with_fallback() that generates plan from recipe
  when not found in cache
- Share this helper between plan page and node detail endpoint
- Removes code duplication

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

server.py

@@ -1373,6 +1373,46 @@ def load_plan_for_run(run: RunStatus) -> Optional[dict]:
     return None
 
 
+async def load_plan_for_run_with_fallback(run: RunStatus) -> Optional[dict]:
+    """Load plan data for a run, with fallback to generate from recipe."""
+    # First try cached plans
+    plan_data = load_plan_for_run(run)
+    if plan_data:
+        return plan_data
+
+    # Fallback: generate from recipe
+    recipe_name = run.recipe.replace("recipe:", "") if run.recipe.startswith("recipe:") else run.recipe
+    recipe_status = None
+    for recipe in list_all_recipes():
+        if recipe.name == recipe_name:
+            recipe_status = recipe
+            break
+
+    if recipe_status:
+        recipe_path = cache_manager.get_by_content_hash(recipe_status.recipe_id)
+        if recipe_path and recipe_path.exists():
+            try:
+                recipe_yaml = recipe_path.read_text()
+                # Build input_hashes mapping from run inputs
+                input_hashes = {}
+                for i, var_input in enumerate(recipe_status.variable_inputs):
+                    if i < len(run.inputs):
+                        input_hashes[var_input.node_id] = run.inputs[i]
+
+                # Try to generate plan
+                try:
+                    from tasks.orchestrate import generate_plan as gen_plan_task
+                    plan_result = gen_plan_task(recipe_yaml, input_hashes)
+                    if plan_result and plan_result.get("status") == "planned":
+                        return plan_result
+                except ImportError:
+                    pass
+            except Exception as e:
+                logger.warning(f"Failed to generate plan for run {run.run_id}: {e}")
+
+    return None
+
+
 @app.get("/run/{run_id}/plan/node/{step_id}", response_class=HTMLResponse)
 async def run_plan_node_detail(run_id: str, step_id: str, request: Request):
     """HTMX partial: Get node detail HTML fragment."""
@@ -1384,8 +1424,8 @@ async def run_plan_node_detail(run_id: str, step_id: str, request: Request):
     if not run:
         return HTMLResponse(f'<p class="text-red-400">Run not found</p>', status_code=404)
 
-    # Load plan data
-    plan_data = await asyncio.to_thread(load_plan_for_run, run)
+    # Load plan data (with fallback to generate from recipe)
+    plan_data = await asyncio.to_thread(load_plan_for_run_with_fallback, run)
 
     if not plan_data:
         return HTMLResponse('<p class="text-gray-400">Plan not found</p>')
@@ -1531,40 +1571,8 @@ async def run_plan_visualization(run_id: str, request: Request, node: Optional[s
         content = '<p class="text-red-400 py-8 text-center">Access denied.</p>'
         return HTMLResponse(render_page("Access Denied", content, ctx.actor_id, active_tab="runs"), status_code=403)
 
-    # Try to load existing plan from cache
-    plan_data = await asyncio.to_thread(load_plan_for_run, run)
-
-    # If no cached plan, try to generate one from the recipe
-    if not plan_data:
-        recipe_name = run.recipe.replace("recipe:", "") if run.recipe.startswith("recipe:") else run.recipe
-        recipe_status = None
-        for recipe in list_all_recipes():
-            if recipe.name == recipe_name:
-                recipe_status = recipe
-                break
-
-        if recipe_status:
-            recipe_path = cache_manager.get_by_content_hash(recipe_status.recipe_id)
-            if recipe_path and recipe_path.exists():
-                try:
-                    recipe_yaml = recipe_path.read_text()
-                    # Build input_hashes mapping from run inputs
-                    input_hashes = {}
-                    for i, var_input in enumerate(recipe_status.variable_inputs):
-                        if i < len(run.inputs):
-                            input_hashes[var_input.node_id] = run.inputs[i]
-
-                    # Try to generate plan using the orchestrate module
-                    try:
-                        from tasks.orchestrate import generate_plan as gen_plan_task
-                        # Call synchronously (it's fast for just planning)
-                        plan_result = gen_plan_task(recipe_yaml, input_hashes)
-                        if plan_result and plan_result.get("status") == "planned":
-                            plan_data = plan_result
-                    except ImportError:
-                        pass
-                except Exception as e:
-                    logger.warning(f"Failed to generate plan for run {run_id}: {e}")
+    # Load plan data (with fallback to generate from recipe)
+    plan_data = await asyncio.to_thread(load_plan_for_run_with_fallback, run)
 
     # Build sub-navigation tabs
     tabs_html = render_run_sub_tabs(run_id, active="plan")