fix(marketplace): close client contract gaps

tests/unit/plugin-marketplace-pages.test.tsx

@@ -130,6 +130,31 @@ describe('My Plugins', () => {
     expect(screen.getByText('当前频道：Beta')).toBeVisible();
   });
 
+  it('keeps a failed Beta update on the explicit Beta route', () => {
+    const onUpdate = vi.fn();
+    const onInstallBeta = vi.fn();
+    render(<MemoryRouter><MyPluginsView
+      library={{ ...library, items: [library.items[0]] }}
+      installations={{
+        'makelore.notes': {
+          status: 'unavailable',
+          pluginId: 'makelore.notes',
+          channel: 'beta',
+          version: '2.0.0',
+          releaseId: 'beta-1',
+          reason: 'plugin_release_unavailable',
+        },
+      }}
+      state="ready" pending={{}} onRefresh={vi.fn()} onInstall={vi.fn()} onUpdate={onUpdate}
+      onInstallBeta={onInstallBeta} onUninstall={vi.fn()} onRemove={vi.fn()} onReacquire={vi.fn()}
+    /></MemoryRouter>);
+
+    fireEvent.click(screen.getByRole('button', { name: '更新 Beta灵感笔记' }));
+    expect(onInstallBeta).toHaveBeenCalledWith('makelore.notes');
+    expect(onUpdate).not.toHaveBeenCalled();
+    expect(screen.getByText('当前频道：Beta')).toBeVisible();
+  });
+
   it('does not silently fall back to stable when the installed Beta channel has no release', () => {
     render(<MemoryRouter><MyPluginsView
       library={{ ...library, items: [{ ...library.items[0], betaVersion: null }] }}