Two tabs in one browser can now run two different signed-in accounts at once.
- The signed session cookie stays the browser's account WALLET (account_ids). Which account a
given tab acts as is a per-tab choice held in sessionStorage and sent per-request via the
X-Siftlode-Account header; current_user honours it only for an account already in the wallet,
without mutating the cookie's default account. Switching accounts sets the header + reloads
THIS tab only, instead of the old cookie-wide switch that changed every tab.
- WebSocket can't send headers, so the per-tab account rides in the ?account= query param
(validated against the wallet).
- Logout is per-tab aware: it signs the requesting tab's active account out of the wallet
(promoting a new default only if the removed one was the default), and the tab drops its
override. A stale per-tab header account 401s just that tab instead of clearing the session.
- Serve index.html with Cache-Control: no-cache so a deploy's new hashed bundle is picked up
immediately instead of the browser running a heuristically-cached stale index.html.
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