docs(changelog): record CSV import improvements under Unreleased

CHANGELOG.md

@@ -5,6 +5,18 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Added
+- **CSV import – groups column** – Members can be assigned to groups during CSV import via a `Groups`/`Gruppen` column; group names that do not exist yet are created automatically, and re-importing the same file does not create duplicate groups.
+- **CSV import – membership fee type column** – A `Fee Type`/`Beitragsart` column assigns each member's membership fee type; an unknown name falls back to the default fee type and is flagged in the preview with a link to create it.
+- **CSV import – mapping preview** – After uploading a file, a preview shows how every column maps (with sample rows and warnings for ignored or unknown columns) and the import only starts once you confirm.
+- **Dynamic CSV import templates** – The EN and DE import-template downloads now include the association's current custom fields instead of a fixed column set.
+
+### Fixed
+- **CSV date round-trip** – Date custom-field values are now exported as ISO-8601 (`YYYY-MM-DD`), so an exported CSV can be re-imported without date-parsing errors.
+- **CSV import – fee-status columns ignored** – Columns such as `Bezahlstatus` / `Membership Fee Status` are always ignored on import and never stored as a custom-field value, even when a custom field of the same name exists.
+
 ## [1.2.0] - 2026-05-08
 
 ### Changed