- Shared reactive auth store (auth.user) + postJSON helper (sends the cookie).
- SignIn modal: email -> "check your inbox" (calm, no password); Google slots in
here in Phase 2.
- /auth/verify route exchanges the magic-link token for a session, then home.
- Header shows "Sign in" or an account avatar; the You sheet gains "Signed in as
…" + Sign out (or a Sign in row). Anonymous browsing is unchanged.
thejayman77
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