docs: finalize report assets and polish dashboard UI

docs/diagrams/collaboration.mmd

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+graph TD
+  Admin[Admin]
+  Auth[Auth + Protected Route]
+  UI[Dashboard Pages]
+  Query[TanStack Query]
+  TRPC[tRPC Client]
+  Router[Protected Routers]
+  DomainRouter[domainsRouter]
+  Checker[DNS Check Module]
+  DB[(PostgreSQL / Drizzle)]
+  DNS[node:dns resolve4]
+  Toast[Toast]
+
+  subgraph Client[Client Side]
+    Auth --> UI --> Query --> TRPC
+    UI --> Toast
+  end
+
+  subgraph Server[Server Side]
+    Router --> DB
+    Router --> DomainRouter
+    DomainRouter --> Checker
+    Checker --> DNS
+    Checker --> DB
+  end
+
+  Admin --> Auth
+  TRPC --> Router
+  Router --> TRPC