docs: update docs

docs/csv-member-import-v1.md

@@ -2,7 +2,7 @@
 
 **Version:** 1.0  
 **Last Updated:** 2026-01-13  
-**Status:** In Progress (Backend Complete, UI Pending)  
+**Status:** In Progress (Backend Complete, UI Complete, Tests Pending)  
 **Related Documents:**
 - [Feature Roadmap](./feature-roadmap.md) - Overall feature planning
 
@@ -15,15 +15,15 @@
 - ✅ Issue #4: Header Normalization + Per-Header Mapping
 - ✅ Issue #5: Validation (Required Fields) + Error Formatting
 - ✅ Issue #6: Persistence via Ash Create + Per-Row Error Capture (with Error-Capping)
-- ✅ Issue #11: Custom Field Import (Backend)
+- ✅ Issue #7: Admin Global Settings LiveView UI (Upload + Start Import + Results + Template Links)
+- ✅ Issue #8: Authorization + Limits
+- ✅ Issue #11: Custom Field Import (Backend + UI)
 
 **In Progress / Pending:**
-- ⏳ Issue #7: Admin Global Settings LiveView UI (Upload + Start Import + Results)
-- ⏳ Issue #8: Authorization + Limits
 - ⏳ Issue #9: End-to-End LiveView Tests + Fixtures
 - ⏳ Issue #10: Documentation Polish
 
-**Latest Update:** Error-Capping in `process_chunk/4` implemented (2025-01-XX)
+**Latest Update:** CSV Import UI fully implemented in GlobalSettingsLive with chunk processing, progress tracking, error display, and custom field support (2026-01-13)
 
 ---
 
@@ -161,6 +161,13 @@ A **basic CSV member import feature** that allows administrators to upload a CSV
 - Any custom field column using the custom field's **name** as the header (e.g., `membership_number`, `birth_date`)
 - **Important:** Custom fields must be created in Mila before importing. The CSV header must match the custom field name exactly (same normalization as member fields).
 - **Behavior:** If the CSV contains custom field columns that don't exist in Mila, a warning message will be shown and those columns will be ignored during import.
+- **Value Validation:** Custom field values are validated according to the custom field type:
+  - **string**: Any text value (trimmed)
+  - **integer**: Must be a valid integer (e.g., `42`, `-10`). Invalid values will cause a row error with the custom field name and reason.
+  - **boolean**: Accepts `true`, `false`, `1`, `0`, `yes`, `no`, `ja`, `nein` (case-insensitive). Invalid values will cause a row error.
+  - **date**: Must be in ISO-8601 format (YYYY-MM-DD, e.g., `2024-01-15`). Invalid values will cause a row error.
+  - **email**: Must be a valid email format (contains `@`, 5-254 characters, valid format). Invalid values will cause a row error.
+- **Error Messages:** Custom field validation errors are included in the import error list with format: `custom_field: <name> – <reason>` (e.g., `custom_field: Alter – expected integer, got: abc`)
 
 **Member Field Header Mapping:**
 
@@ -496,36 +503,51 @@ Use `Mv.Authorization.PermissionSets` (preferred) instead of hard-coded string c
 
 **Dependencies:** Issue #6
 
+**Status:** ✅ **COMPLETED**
+
 **Goal:** UI section with upload, progress, results, and template links.
 
 **Tasks:**
-- [ ] Render import section only for admins
-- [ ] **Add prominent UI notice about custom fields:**
+- [x] Render import section only for admins
+- [x] **Add prominent UI notice about custom fields:**
   - Display alert/info box: "Custom fields must be created in Mila before importing CSV files with custom field columns"
   - Explain: "Use the custom field name as the CSV column header (same normalization as member fields applies)"
   - Add link to custom fields management section
-- [ ] Configure `allow_upload/3`:
-  - `.csv` only, `max_entries: 1`, `max_file_size: 10MB`, `auto_upload: false`
-- [ ] `handle_event("start_import", ...)`:
+- [x] Configure `allow_upload/3`:
+  - `.csv` only, `max_entries: 1`, `max_file_size: 10MB`, `auto_upload: true` (auto-upload enabled for better UX)
+- [x] `handle_event("start_import", ...)`:
   - Admin permission check
   - Consume upload -> read file content
   - Call `MemberCSV.prepare/2`
   - Store `import_state` in assigns (chunks + column_map + metadata)
   - Initialize progress assigns
   - `send(self(), {:process_chunk, 0})`
-- [ ] `handle_info({:process_chunk, idx}, socket)`:
+- [x] `handle_info({:process_chunk, idx}, socket)`:
   - Fetch chunk from `import_state`
-  - Call `MemberCSV.process_chunk/3`
+  - Call `MemberCSV.process_chunk/4` with error capping support
   - Merge counts/errors into progress assigns (cap errors at 50 overall)
   - Schedule next chunk (or finish and show results)
-- [ ] Results UI:
+  - Async task processing with SQL sandbox support for tests
+- [x] Results UI:
   - Success count
   - Failure count
   - Error list (line number + message + field)
   - **Warning messages for unknown custom field columns** (non-existent names) shown in results
+  - Progress indicator during import
+  - Error truncation notice when errors exceed limit
 
 **Template links:**
-- Link `/templates/member_import_en.csv` and `/templates/member_import_de.csv` via Phoenix static path helpers.
+- [x] Link `/templates/member_import_en.csv` and `/templates/member_import_de.csv` via Phoenix static path helpers.
+
+**Definition of Done:**
+- [x] Upload area with drag & drop support
+- [x] Template download links (EN/DE)
+- [x] Progress tracking during import
+- [x] Results display with success/error counts
+- [x] Error list with line numbers and field information
+- [x] Warning display for unknown custom field columns
+- [x] Admin-only access control
+- [x] Async chunk processing with proper error handling
 
 ---
 
@@ -533,19 +555,32 @@ Use `Mv.Authorization.PermissionSets` (preferred) instead of hard-coded string c
 
 **Dependencies:** None (can be parallelized)
 
+**Status:** ✅ **COMPLETED**
+
 **Goal:** Ensure admin-only access and enforce limits.
 
 **Tasks:**
-- [ ] Admin check in start import event handler
-- [ ] File size enforced in upload config
-- [ ] Row limit enforced in `MemberCSV.prepare/2` (max_rows from config)
-- [ ] Configuration:
-  ```elixir
-  config :mv, csv_import: [
-    max_file_size_mb: 10,
-    max_rows: 1000
-  ]
-  ```
+- [x] Admin check in start import event handler (via `Authorization.can?/3`)
+- [x] File size enforced in upload config (`max_file_size: 10MB`)
+- [x] Row limit enforced in `MemberCSV.prepare/2` (max_rows: 1000, configurable via opts)
+- [x] Chunk size limit (200 rows per chunk)
+- [x] Error limit (50 errors per import)
+- [x] UI-level authorization check (import section only visible to admins)
+- [x] Event-level authorization check (prevents unauthorized import attempts)
+
+**Implementation Notes:**
+- File size limit: 10 MB (10,485,760 bytes) enforced via `allow_upload/3`
+- Row limit: 1,000 rows (excluding header) enforced in `MemberCSV.prepare/2`
+- Chunk size: 200 rows per chunk (configurable via opts)
+- Error limit: 50 errors per import (configurable via `@max_errors`)
+- Authorization uses `MvWeb.Authorization.can?/3` with `:create` permission on `Mv.Membership.Member`
+
+**Definition of Done:**
+- [x] Admin-only access enforced at UI and event level
+- [x] File size limit enforced
+- [x] Row count limit enforced
+- [x] Chunk processing with size limits
+- [x] Error capping implemented
 
 ---
 
@@ -589,7 +624,7 @@ Use `Mv.Authorization.PermissionSets` (preferred) instead of hard-coded string c
 
 **Priority:** High (Core v1 Feature)
 
-**Status:** ✅ **COMPLETED** (Backend Implementation)
+**Status:** ✅ **COMPLETED** (Backend + UI Implementation)
 
 **Goal:** Support importing custom field values from CSV columns. Custom fields should exist in Mila before import for best results.
 
@@ -604,23 +639,26 @@ Use `Mv.Authorization.PermissionSets` (preferred) instead of hard-coded string c
 - [x] Query existing custom fields during `prepare/2` to map custom field columns
 - [x] Collect unknown custom field columns and add warning messages (don't fail import)
 - [x] Map custom field CSV values to `CustomFieldValue` creation in `process_chunk/4`
-- [x] Handle custom field type validation (string, integer, boolean, date, email)
+- [x] Handle custom field type validation (string, integer, boolean, date, email) with proper error messages
 - [x] Create `CustomFieldValue` records linked to members during import
-- [ ] Update error messages to include custom field validation errors (if needed)
-- [ ] Add UI help text explaining custom field requirements (pending Issue #7):
+- [x] Validate custom field values and return structured errors with custom field name and reason
+- [x] UI help text and link to custom field management (implemented in Issue #7)
+- [x] Update error messages to include custom field validation errors (format: `custom_field: <name> – expected <type>, got: <value>`)
+- [x] Add UI help text explaining custom field requirements (completed in Issue #7):
   - "Custom fields must be created in Mila before importing"
   - "Use the custom field name as the CSV column header (same normalization as member fields)"
   - Link to custom fields management section
-- [ ] Update CSV templates documentation to explain custom field columns (pending Issue #1)
+- [x] Update CSV templates documentation to explain custom field columns (documented in Issue #1)
 - [x] Add tests for custom field import (valid, invalid name, type validation, warning for unknown)
 
 **Definition of Done:**
 - [x] Custom field columns are recognized by name (with normalization)
 - [x] Warning messages shown for unknown custom field columns (import continues)
 - [x] Custom field values are created and linked to members
-- [x] Type validation works for all custom field types
-- [ ] UI clearly explains custom field requirements (pending Issue #7)
+- [x] Type validation works for all custom field types (string, integer, boolean, date, email)
+- [x] UI clearly explains custom field requirements (completed in Issue #7)
 - [x] Tests cover custom field import scenarios (including warning for unknown names)
+- [x] Error messages include custom field validation errors with proper formatting
 
 **Implementation Notes:**
 - Custom field lookup is built in `prepare/2` and passed via `custom_field_lookup` in opts