feat(#37-41): Add domains, ideas, relationships, agents, widgets schema

Schema additions for issues #37-41:

New models:
- Domain (#37): Life domains (work, marriage, homelab, etc.)
- Idea (#38): Brain dumps with pgvector embeddings
- Relationship (#39): Generic entity linking (blocks, depends_on)
- Agent (#40): ClawdBot agent tracking with metrics
- AgentSession (#40): Conversation session tracking
- WidgetDefinition (#41): HUD widget registry
- UserLayout (#41): Per-user dashboard configuration

Updated models:
- Task, Event, Project: Added domainId foreign key
- User, Workspace: Added new relations

New enums:
- IdeaStatus: CAPTURED, PROCESSING, ACTIONABLE, ARCHIVED, DISCARDED
- RelationshipType: BLOCKS, BLOCKED_BY, DEPENDS_ON, etc.
- AgentStatus: IDLE, WORKING, WAITING, ERROR, TERMINATED
- EntityType: Added IDEA, DOMAIN

Migration: 20260129182803_add_domains_ideas_agents_widgets

apps/web/src/components/auth/LogoutButton.tsx

@@ -0,0 +1,31 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+import { Button, type ButtonProps } from "@mosaic/ui";
+import { useAuth } from "@/lib/auth/auth-context";
+
+interface LogoutButtonProps {
+  variant?: ButtonProps["variant"];
+  className?: string;
+}
+
+export function LogoutButton({ variant = "secondary", className }: LogoutButtonProps) {
+  const router = useRouter();
+  const { signOut } = useAuth();
+
+  const handleSignOut = async () => {
+    try {
+      await signOut();
+    } catch (error) {
+      console.error("Sign out error:", error);
+    } finally {
+      router.push("/login");
+    }
+  };
+
+  return (
+    <Button variant={variant} onClick={handleSignOut} className={className}>
+      Sign Out
+    </Button>
+  );
+}