feat: Introduce dedicated participant, experiment, and trial detail/edit pages, enable MinIO, and refactor dashboard navigation.

src/components/experiments/designer/DesignerRoot.tsx

@@ -736,6 +736,16 @@ export function DesignerRoot({
         const targetStep = steps.find((s) => s.id === stepId);
         if (!targetStep) return;
 
+        const fullDef = actionRegistry.getAction(actionDef.type);
+        const defaultParams: Record<string, unknown> = {};
+        if (fullDef?.parameters) {
+          for (const param of fullDef.parameters) {
+            if (param.default !== undefined) {
+              defaultParams[param.id] = param.default;
+            }
+          }
+        }
+
         const execution: ExperimentAction["execution"] =
           actionDef.execution &&
             (actionDef.execution.transport === "internal" ||
@@ -754,7 +764,7 @@ export function DesignerRoot({
           type: actionDef.type,
           name: actionDef.name,
           category: actionDef.category as ExperimentAction["category"],
-          parameters: {},
+          parameters: defaultParams,
           source: actionDef.source as ExperimentAction["source"],
           execution,
         };
@@ -818,6 +828,7 @@ export function DesignerRoot({
         description={designMeta.description || "No description"}
         icon={Play}
         actions={actions}
+        className="pb-6"
       />
 
       <div className="relative flex flex-1 flex-col overflow-hidden">

src/components/experiments/designer/PropertiesPanel.tsx

@@ -70,7 +70,7 @@ export interface PropertiesPanelProps {
   className?: string;
 }
 
-export function PropertiesPanel({
+export function PropertiesPanelBase({
   design,
   selectedStep,
   selectedAction,
@@ -198,8 +198,8 @@ export function PropertiesPanel({
     const ResolvedIcon: React.ComponentType<{ className?: string }> =
       def?.icon && iconComponents[def.icon]
         ? (iconComponents[def.icon] as React.ComponentType<{
-            className?: string;
-          }>)
+          className?: string;
+        }>)
         : Zap;
 
     return (
@@ -633,3 +633,5 @@ export function PropertiesPanel({
     </div>
   );
 }
+
+export const PropertiesPanel = React.memo(PropertiesPanelBase);

src/components/experiments/designer/panels/InspectorPanel.tsx

@@ -284,14 +284,17 @@ export function InspectorPanel({
               <div className="flex-1 overflow-x-hidden overflow-y-auto">
                 <div className="w-full px-0 py-2 break-words whitespace-normal">
                   <PropertiesPanel
-                    design={{
-                      id: "design",
-                      name: "Design",
-                      description: "",
-                      version: 1,
-                      steps,
-                      lastSaved: new Date(),
-                    }}
+                    design={useMemo(
+                      () => ({
+                        id: "design",
+                        name: "Design",
+                        description: "",
+                        version: 1,
+                        steps,
+                        lastSaved: new Date(),
+                      }),
+                      [steps],
+                    )}
                     selectedStep={selectedStep}
                     selectedAction={selectedAction}
                     onActionUpdate={handleActionUpdate}

src/components/experiments/designer/state/validators.ts

@@ -645,7 +645,7 @@ export function validateExecution(
         issues.push({
           severity: "warning",
           message:
-            "Multiple steps with trial_start trigger may cause execution conflicts",
+            "Multiple steps will start simultaneously. Ensure parallel execution is intended.",
           category: "execution",
           field: "trigger.type",
           stepId: step.id,