feat(dashboard): extract SessionActions component and convert learning space tabs to path-based routes (#530)

- Extract shared SessionActions component (Messages, Tasks, Config, Delete)
  for both Dashboard and Dashboard OSS, replacing inline action buttons
- Convert learning space detail tabs from query params (?tab=) to path-based
  routes (/skills, /sessions, /metadata) using layout + sub-routes pattern
- Use React Context in layout client to share data across tab routes
- Use Tabs/TabsList/TabsTrigger components for consistent tab styling

Author: GenerQAQ

dashboard/app/project/[id]/learning-spaces/[spaceId]/layout.tsx

@@ -0,0 +1,43 @@
+import { redirect } from "next/navigation";
+import { LearningSpaceLayoutClient } from "./learning-space-layout-client";
+import {
+  getCurrentUser,
+  getProject,
+} from "@/lib/supabase/operations";
+import { decodeId } from "@/lib/id-codec";
+
+interface LayoutProps {
+  params: Promise<{ id: string; spaceId: string }>;
+  children: React.ReactNode;
+}
+
+export default async function LearningSpaceLayout({
+  params,
+  children,
+}: LayoutProps) {
+  const { id: projectId, spaceId } = await params;
+  const actualProjectId = decodeId(projectId);
+  const actualSpaceId = decodeId(spaceId);
+
+  await getCurrentUser();
+
+  const project = await getProject(actualProjectId);
+
+  if (!project) {
+    redirect("/");
+  }
+
+  return (
+    <LearningSpaceLayoutClient
+      project={{
+        id: project.project_id,
+        name: project.name,
+        organization_id: project.organization_id,
+        created_at: project.created_at,
+      }}
+      spaceId={actualSpaceId}
+    >
+      {children}
+    </LearningSpaceLayoutClient>
+  );
+}