debug(auth): log session cookie source

apps/web/src/lib/auth/auth-context.tsx

@@ -11,6 +11,7 @@ import {
 } from "react";
 import type { AuthUser, AuthSession } from "@mosaic/shared";
 import { apiGet, apiPost } from "../api/client";
+import { IS_MOCK_AUTH_MODE } from "../config";
 import { parseAuthError } from "./auth-errors";
 
 /**
@@ -23,6 +24,11 @@ const SESSION_EXPIRY_WARNING_MINUTES = 5;
 
 /** Interval in milliseconds to check session expiry */
 const SESSION_CHECK_INTERVAL_MS = 60_000;
+const MOCK_AUTH_USER: AuthUser = {
+  id: "dev-user-local",
+  email: "dev@localhost",
+  name: "Local Dev User",
+};
 
 interface AuthContextValue {
   user: AuthUser | null;
@@ -70,6 +76,14 @@ function logAuthError(message: string, error: unknown): void {
 }
 
 export function AuthProvider({ children }: { children: ReactNode }): React.JSX.Element {
+  if (IS_MOCK_AUTH_MODE) {
+    return <MockAuthProvider>{children}</MockAuthProvider>;
+  }
+
+  return <RealAuthProvider>{children}</RealAuthProvider>;
+}
+
+function RealAuthProvider({ children }: { children: ReactNode }): React.JSX.Element {
   const [user, setUser] = useState<AuthUser | null>(null);
   const [isLoading, setIsLoading] = useState(true);
   const [authError, setAuthError] = useState<AuthErrorType>(null);
@@ -176,6 +190,33 @@ export function AuthProvider({ children }: { children: ReactNode }): React.JSX.E
   return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
 }
 
+function MockAuthProvider({ children }: { children: ReactNode }): React.JSX.Element {
+  const [user, setUser] = useState<AuthUser | null>(MOCK_AUTH_USER);
+
+  const signOut = useCallback((): Promise<void> => {
+    setUser(null);
+    return Promise.resolve();
+  }, []);
+
+  const refreshSession = useCallback((): Promise<void> => {
+    setUser(MOCK_AUTH_USER);
+    return Promise.resolve();
+  }, []);
+
+  const value: AuthContextValue = {
+    user,
+    isLoading: false,
+    isAuthenticated: user !== null,
+    authError: null,
+    sessionExpiring: false,
+    sessionMinutesRemaining: 0,
+    signOut,
+    refreshSession,
+  };
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+}
+
 export function useAuth(): AuthContextValue {
   const context = useContext(AuthContext);
   if (context === undefined) {