feat(web): add copyright notice + footer/toolbar polish (#1639)

- Add a grey CopyrightBadge ("Copyright © Model Context Protocol a Series of LF
  Projects, LLC.") to the footer. Version (bottom-left) and copyright
  (bottom-right) share the bottom `xl` margin band: vertically centered in it
  and inset by `xl` to line up with the content's left/right margins.
- Move the list expand/collapse toggle to the right of the "Add Servers" button
  in ServerListControls.
- Make the monitoring column's close-sidebar control match the open-sidebar
  PinColumnButton theme (Button size sm / variant subtle) instead of a gray
  ActionIcon, so the open/close affordances read as a pair.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BrihGWcrM9JGRyu41nzZYw

clients/web/src/App.tsx

@@ -102,6 +102,7 @@ import { useInspectorVersion } from "@inspector/core/react/useInspectorVersion.j
 import { usePendingClientRequests } from "@inspector/core/react/usePendingClientRequests.js";
 import { InspectorView } from "./components/views/InspectorView/InspectorView";
 import { VersionBadge } from "./components/elements/VersionBadge/VersionBadge";
+import { CopyrightBadge } from "./components/elements/CopyrightBadge/CopyrightBadge";
 import type {
   ToolCallState,
   ToolsUiState,
@@ -3824,6 +3825,7 @@ function App() {
           onRefreshApps={onRefreshTools}
         />
       </Box>
+      <CopyrightBadge />
       <VersionBadge version={inspectorVersion} />
       <ServerConfigModal
         opened={configModal !== null}