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Stefan Hildebrandt
01e5cd69cf
The default sender identity (`preferredPrimaryId`) lived only in the browser-local `identity-storage` store and was never written to the synced settings, so the choice was lost on clearing site data / switching browsers and never appeared in exported settings. Persist it 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. This supersedes the earlier username-keyed fix that had landed on main: the username-keyed map, `loadIdentities()` fallback write, and the `applyPreferredIdentityOrdering` store action (plus its settings-store hook) are removed so a single account-keyed mechanism remains. - settings-store: `preferredIdentityIds` (accountId -> identityId) in state, defaults, export, import (non-record guard), rehydrate coercion, v6 migration. - auth-store: `applyPreferredIdentity(accountId?)` reorders the active account's identities once synced settings load, and performs the one-time migration of the pre-#507 browser-local default into the synced map (keyed by accountId). Invoked from every `loadFromServer().finally()` (login / OAuth / SSO / switch / restore). `loadIdentities()` now only applies the local fallback ordering. - identity-manager-modal: the star action writes the choice by `activeAccountId`. - identity-store: `preferredPrimaryId` kept as a local (sync-off) fallback. - tests: per-account independence, export/import round-trip, import guard, and applyPreferredIdentity reorder / active-account gating / local-default migration.