fix: Prevent plugin detail hook mismatch during reload

Plugin actions refresh the selected plugin detail after mutating enabled state. The detail component can enter its loading branch while a plugin is still selected, so every hook must run before that early return.

Constraint: React hook order must stay identical across the detail and loading render paths.
Rejected: Clear the selected plugin before reload | would hide the current context and add UI churn during short refreshes.
Confidence: high
Scope-risk: narrow
Directive: Keep PluginDetail hooks before loading and empty-state returns when adding detail-derived memoization.
Tested: cd desktop && bun run test src/__tests__/pluginsSettings.test.tsx
Tested: cd desktop && bun run lint
Tested: cd desktop && bun run build
Not-tested: Full desktop Vitest suite has pre-existing locale assertion failures unrelated to this plugin fix.

desktop/src/__tests__/pluginsSettings.test.tsx

@@ -1,5 +1,5 @@
 import { beforeEach, describe, expect, it, vi } from 'vitest'
-import { fireEvent, render, screen } from '@testing-library/react'
+import { act, fireEvent, render, screen } from '@testing-library/react'
 import '@testing-library/jest-dom'
 
 import { Settings } from '../pages/Settings'
@@ -338,6 +338,59 @@ describe('Settings > Plugins tab', () => {
     expect(screen.getByText('Uninstall')).toBeInTheDocument()
   })
 
+  it('keeps plugin detail hook order stable while the selected plugin reloads', () => {
+    usePluginStore.setState({
+      selectedPlugin: {
+        id: 'github@claude-plugins-official',
+        name: 'github',
+        marketplace: 'claude-plugins-official',
+        scope: 'user',
+        enabled: false,
+        hasErrors: false,
+        isBuiltin: false,
+        description: 'GitHub integration',
+        componentCounts: {
+          commands: 1,
+          agents: 0,
+          skills: 0,
+          hooks: 0,
+          mcpServers: 0,
+          lspServers: 0,
+        },
+        capabilities: {
+          commands: ['review-pr'],
+          agents: [],
+          skills: [],
+          hooks: [],
+          mcpServers: [],
+          lspServers: [],
+        },
+        commandEntries: [
+          {
+            name: 'review-pr',
+            description: 'Review the current pull request.',
+          },
+        ],
+        agentEntries: [],
+        hookEntries: [],
+        skillEntries: [],
+        mcpServerEntries: [],
+        errors: [],
+      },
+    })
+
+    const { container } = render(<Settings />)
+    switchToPluginsTab()
+
+    expect(screen.getByText('GitHub integration')).toBeInTheDocument()
+
+    act(() => {
+      usePluginStore.setState({ isDetailLoading: true })
+    })
+
+    expect(container.querySelector('.animate-spin')).toBeInTheDocument()
+  })
+
   it('navigates plugin skills into the shared Skills page flow', () => {
     usePluginStore.setState({
       selectedPlugin: {

desktop/src/components/plugins/PluginDetail.tsx

@@ -42,6 +42,15 @@ export function PluginDetail() {
   const activeSession = sessions.find((session) => session.id === activeSessionId)
   const currentWorkDir = activeSession?.workDir || undefined
 
+  const otherCapabilityItems = useMemo(
+    () =>
+      CAPABILITY_ORDER.map((key) => ({
+        key,
+        items: selectedPlugin?.capabilities[key] ?? [],
+      })),
+    [selectedPlugin],
+  )
+
   if (isDetailLoading) {
     return (
       <div className="flex justify-center py-12">
@@ -54,14 +63,6 @@ export function PluginDetail() {
 
   const canMutate = selectedPlugin.scope !== 'managed' && selectedPlugin.scope !== 'builtin'
   const canNavigateSharedCapabilities = selectedPlugin.enabled
-  const otherCapabilityItems = useMemo(
-    () =>
-      CAPABILITY_ORDER.map((key) => ({
-        key,
-        items: selectedPlugin.capabilities[key],
-      })),
-    [selectedPlugin],
-  )
 
   const runAction = async (key: string, fn: () => Promise<string>) => {
     setActionKey(key)