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Stefan Hildebrandt
034f7a4b9b
The default sender identity (`preferredPrimaryId`) lived only in the browser-local `identity-storage` Zustand store and was never written to the server-side synced settings. As a result the choice was lost when clearing site data or switching browsers, and never appeared in the exported settings JSON. Persist the default identity in the synced settings store, keyed per account (`preferredIdentityIds: Record<accountId, identityId>`), mirroring the existing per-account `allMailFolderIds`. Per-account keying is required because JMAP identity ids are account-scoped and would otherwise collide across accounts / the unified mailbox. - settings-store: add `preferredIdentityIds` to state, defaults, export (so it shows in exported JSON), import (with a non-record guard), rehydrate coercion, and a v6->v7 migration. - auth-store: add `applyPreferredIdentity()`, invoked in every `loadFromServer().finally()` (login / OAuth / SSO / switch / restore) so the synced default reorders the active account's identities once server settings load (the composer defaults From to identities[0]). - identity-manager-modal: the star action also writes the choice to the synced per-account map, triggering server sync + export inclusion. - identity-store: keep `preferredPrimaryId` in local persist as a sync-off fallback; synced settings are the durable cross-device source of truth. - tests: per-account independence, export/import round-trip, non-record import guard, and v6->v7 migration.