test(admin): PluginsView and settings paths

- PluginsView: tab switching, one request per typing burst and a blank
  search without q, name fallback on cards, copied state clearing, a
  refused clipboard write, a failed marketplace request
- useSettings: settingsPath prefers path, then controller, then the
  singleton form; settingsEntryForPath

admin/tests/state/useSettings.test.ts

@@ -5,6 +5,7 @@ import {
   setSettings,
   settings,
   settingsEntry,
+  settingsEntryForPath,
   settingsGroups,
   settingsLinkFor,
   settingsPath,
@@ -56,6 +57,25 @@ describe('useSettings (D-21)', () => {
     expect(useSettings().settingsPath).toBe(settingsPath)
   })
 
+  it('prefers an entry path, then its controller, then the singleton form (34-05)', () => {
+    const base = settingsFixture.list.data[0]!
+    expect(settingsPath({ ...base, code: 'plugins', model: '', controller: 'acme.demo.locales', path: '/system/plugins' })).toBe(
+      '/system/plugins',
+    )
+    expect(settingsPath({ ...base, code: 'plugins', model: '', controller: 'acme.demo.locales', path: '' })).toBe('/acme/demo/locales')
+    expect(settingsPath({ ...base, code: 'mail', controller: '', path: undefined })).toBe('/settings/mail')
+    expect(settingsPath({ ...base, code: 'mail', controller: '', path: '' })).toBe('/settings/mail')
+  })
+
+  it('finds the entry of an admin screen by its path', () => {
+    const plugins = { ...settingsFixture.list.data[0]!, code: 'plugins', model: '', controller: '', path: '/system/plugins' }
+    setSettings([...settingsFixture.list.data, plugins])
+    expect(settingsEntryForPath('/system/plugins')?.code).toBe('plugins')
+    expect(settingsEntryForPath('/system/other')).toBeNull()
+    expect(settingsEntryForPath('')).toBeNull()
+    expect(useSettings().settingsEntryForPath).toBe(settingsEntryForPath)
+  })
+
   it('finds the link entry that opens a controller, never a singleton', () => {
     const link = { ...settingsFixture.list.data[0]!, code: 'locales', model: '', controller: 'acme.demo.locales' }
     setSettings([...settingsFixture.list.data, link])