revert: roll back v12.3.3 (Issue Blowout 2026)

SessionStart context injection regressed in v12.3.3 — no memory
context is being delivered to new sessions. Rolling back to the
v12.3.2 tree state while the regression is investigated.

Reverts #2080.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ui/viewer/utils/api.ts

@@ -1,22 +0,0 @@
-/**
- * Authenticated fetch wrapper for viewer API calls.
- * Reads the auth token injected into the page by the server (#1932/#1933).
- */
-
-declare global {
-  interface Window {
-    __CLAUDE_MEM_AUTH_TOKEN__?: string;
-  }
-}
-
-export function authFetch(input: RequestInfo | URL, init?: RequestInit): Promise<Response> {
-  const token = window.__CLAUDE_MEM_AUTH_TOKEN__;
-  if (!token) {
-    return fetch(input, init);
-  }
-
-  const headers = new Headers(init?.headers);
-  headers.set('Authorization', `Bearer ${token}`);
-
-  return fetch(input, { ...init, headers });
-}