## Description of the implemented changes
The changes were:
- [x] Bugfixing
- [x] New Feature
- [ ] Breaking Change
- [x] Refactoring
This PR standardizes interactive table behavior and improves settings robustness.
It makes the new hover/focus-visible row highlight the default for clickable tables, keeps sticky first-column behavior configurable (and optimized for member selection UX), and tightens SMTP source-of-truth handling so ENV-based and UI-based configuration do not conflict.
## What has been changed?
- Refactored `CoreComponents.table` to expose interaction state via `data-row-interactive` and moved default row hover/focus styling to CSS.
- Made the new row highlight behavior (`hover` + `:has(:focus-visible)`) the default for clickable zebra tables.
- Kept sticky-first-column as an explicit table option and preserved sticky-specific selection accent behavior.
- Updated member overview table usage to the sticky-first-column mode and refined scrolling behavior (table scrollbar within container, not page-coupled).
- Adjusted table-related tests to validate the new interaction contract (attribute/CSS-driven behavior instead of legacy ring classes).
- Improved SMTP config handling:
- clearer ENV-vs-Settings behavior (ENV-only mode when host env is set),
- read-only and warning behavior in global settings UI when required env keys are missing,
- updated related config/tests/docs.
- Updated docs and changelog (`CHANGELOG.md`, `DESIGN_GUIDELINES.md`, `CODE_GUIDELINES.md`, SMTP concept docs).
- Updated gettext catalogs (`default.pot`, `en`, `de`) for new/changed UI strings.
## Definition of Done
### Code Quality
- [x] No new technical depths
- [x] Linting passed
- [x] Documentation is added were needed
### Accessibility
- [x] New elements are properly defined with html-tags
- [x] Colour contrast follows WCAG criteria
- [x] Aria labels are added when needed
- [x] Everything is accessible by keyboard
- [x] Tab-Order is comprehensible
- [x] All interactive elements have a visible focus
### Testing
- [x] Tests for new code are written
- [x] All tests pass
- [ ] axe-core dev tools show no critical or major issues
## Additional Notes
- Branch includes 4 commits:
- `fix: make sure smtp can be set either via env or ui`
- `fix: make horizontal scrollbars sticky to bottom`
- `docs: update changelog`
- `feat: make checkbox column in member view sticky`
- Full fast suite passed (`mix test --exclude slow --exclude ui`): 2017 tests, 0 failures (plus expected non-failing warning logs in test output).
- Reviewer focus areas:
1. **Cross-table UX consistency** after moving row interaction styling to component/CSS contract.
2. **Sticky table behavior** (selection accent stripe, zebra background, keyboard focus visibility).
3. **SMTP precedence and UI constraints** in global settings when ENV mode is active.
4. **Regression risk in tests** that previously asserted ring-based row classes.
- No breaking API changes expected; behavior change is primarily visual/interaction-level and intentional.
Reviewed-on: #493
Co-authored-by: Simon <s.thiessen@local-it.org>
Co-committed-by: Simon <s.thiessen@local-it.org>
Consider visible custom fields in compute_final_field_selection so that
a link with only custom_field_X is not wrongly treated as invalid and
reverted to session/global. Add test for URL containing only custom field.
Add tests for required validation, update_single_member_field, form
required map. Add street/postal_code/city to sync_contact when Vereinfacht configured.
- Button only shown when @member.membership_fee_type is set (same as Create Cycle).
- Test: no-type view asserts Regenerate Cycles button is not present.
- CODE_GUIDELINES: correct custom_field/custom_field_value descriptions, add fixtures.ex to test support
- show_membership_fees_test: use Mv.Fixtures.member_fixture, remove redundant create_member helper
- groups-architecture and membership-fee-architecture docs
- Gettext: add/correct German for authorization and membership fee type
- membership_fee_helpers_test and membership_fee_status_test adjustments
- Show: handle_info :member_updated and :put_flash; Linked User only when can_access_page? /users
- MembershipFeesComponent: can_create_cycle/can_destroy_cycle/can_update_cycle; buttons gated
- Delete all cycles via Ash.destroy (policy enforced); format_error Forbidden
- Regenerate cycles for normal_user and admin (no admin-only check)
- Member form: format_error tuple for membership_fee_type_id; Select a membership fee type (no None)
- show_membership_fees_test: read_only UI and policy tests
- Tests and UI pass actor for CustomField create/read/destroy; seeds use actor
- Member required-custom-fields validation uses context.actor only (no fallback)
- CODE_GUIDELINES: add rule forbidding system-actor fallbacks
