- Merge the two ~identical import-config storage modules into one
(transaction + balance share the same HTTP logic).
- Show the parsed file immediately and load the saved per-account config
off the critical path, so a slow or hanging request never blocks the
preview or Next button; a stale load can't clobber a newer file.
- Drop the dead $hidden on AccountImportConfig (the controller returns
the raw config blob, never the serialized model).
Move the CSV/Excel import column mapping and date format from device
localStorage to a per-account backend record, so the configuration is
preconfigured and loaded automatically when importing from another
device.
Adds an account_import_configs table (one row per account per import
type), an API endpoint scoped by the AccountPolicy, and swaps the
client-side storage helpers from localStorage to axios.
Víctor Falcón