Revert "feat(topics): compute topic overviews and topic pages on the server"

This reverts commit cc04e0944d.

src/hooks/use-auth.ts

@@ -24,10 +24,6 @@ import { storeTimezone } from "@/lib/timezone-mirror";
 import type { ModuleKey } from "@/lib/modules/registry";
 import type { AiCapabilities } from "@/lib/ai/capabilities/types";
 import type { CoachReasoningState } from "@/lib/ai/reasoning/resolve";
-import {
-  resolvePreviewFeatures,
-  type PreviewFeatures,
-} from "@/lib/settings/preview-features";
 import type { ModuleAccessState } from "@/lib/sharing/module-disclosure";
 import type { OnboardingStateDto } from "@/lib/onboarding/needs";
 import type { TourProgress } from "@/lib/onboarding/tour-progress";
@@ -258,14 +254,6 @@ export interface AuthUser {
    * server image that does not publish it.
    */
   coachReasoning?: CoachReasoningState | null;
-  /**
-   * The person's own preview opt-ins, resolved on the server: every
-   * flag present, off unless switched on in Settings > System > Preview
-   * features. Read through `usePreviewFeature`. Optional so existing
-   * fixtures stay valid; `fetchMe` coerces an absent block (an older server)
-   * to every flag off.
-   */
-  previewFeatures?: PreviewFeatures;
   /**
    * v1.36.0 — account sharing, resolved server-side. `accounts` is the
    * switcher's menu, `active` is the record this browser is inside (null when
@@ -489,8 +477,6 @@ export async function fetchMe(): Promise<AuthUser> {
       data.coachReasoning && typeof data.coachReasoning === "object"
         ? data.coachReasoning
         : null,
-    // An older server publishes no opt-ins; every preview stays off.
-    previewFeatures: resolvePreviewFeatures(data.previewFeatures),
     accountAccess,
     accountAccessStatus,
   };