Add the end-to-end spec covering the promise the feature makes: two
browser contexts on the same account converge (appearance fields,
density, navigation mode and pin order), a reset in one context
reaches the other on reload, an account switch renders the new
account's state rather than the previous account's cache, and a
pending write captured before the switch is rejected server-side
without touching either account's rows.
The existing navigation, motion, and effects suites seed a known
server-side preference baseline per suite account so the new
hydration layer cannot overwrite their localStorage-only setups.
Anso
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