test(web): enable developer tools in trajectory image fixture

apps/web/tests/assembled-remote.ts

@@ -71,7 +71,14 @@ interface ControlBaseline {
 
 interface CapturedFixture {
   readonly sessionList: { readonly ok: true; readonly value: { readonly items: readonly SessionSummary[] } }
-  readonly settingsDescribe: unknown
+  readonly settingsDescribe: {
+    readonly ok: true
+    readonly value: {
+      readonly writable: boolean
+      readonly hasDocument: boolean
+      readonly namespaces: readonly unknown[]
+    }
+  }
   readonly credentialsDescribe: unknown
   readonly modelCatalog: unknown
   readonly agentPresets: unknown
@@ -90,6 +97,8 @@ interface CapturedFixture {
 }
 
 export interface AssembledRemoteOptions {
+  /** Supply an enabled Host preference for diagnostic View scenarios. */
+  readonly developerTools?: boolean
   /** Return the fixture's image-dimension admission error from Session prompt. */
   readonly rejectPrompt?: boolean
 }
@@ -131,7 +140,16 @@ export function createAssembledRemote(options: AssembledRemoteOptions = {}): Ass
   const mock = RemoteMock.create().load(remoteDefaultResponses)
   mock.load({
     unary: {
-      'settings/describe': structuredClone(fixture.settingsDescribe),
+      'settings/describe': options.developerTools === true
+        ? ok({
+          ...fixture.settingsDescribe.value,
+          namespaces: [...fixture.settingsDescribe.value.namespaces, {
+            ns: 'ui-developer-tools',
+            schema: { type: 'object', dict: { enabled: { type: 'boolean' } } },
+            value: { enabled: true }, applies: 'live', secrets: [], revision: 0,
+          }],
+        })
+        : structuredClone(fixture.settingsDescribe),
       'credentials/describe': structuredClone(fixture.credentialsDescribe),
       'session/modelCatalog': structuredClone(fixture.modelCatalog),
       'agentPresets/list': structuredClone(fixture.agentPresets),

apps/web/tests/trajectory-image-display.expected.e2e.ts

@@ -81,7 +81,7 @@ it('renders durable record images in the Trajectory details panel from the share
     configurable: true,
     value: () => {},
   })
-  mountAssembledApp()
+  mountAssembledApp({ remote: { developerTools: true } })
   await openFixtureSession()
   const chatSrc = document.querySelector('[data-align="end"] img')?.getAttribute('src')
   if (chatSrc === null || chatSrc === undefined) throw new Error('chat gallery image missing')