rename admin-submit-wrap → admin-form-footer across all templates and CSS

- Updated 6 admin templates: add.php, edit.php, login.php, account.php,
  import.php, pages-edit.php — replaced <div class="admin-submit-wrap">
  with <div class="admin-form-footer">
- Updated 8 CSS selectors in admin.css:
  - .admin-form-footer { margin-top/padding-top } (was .admin-submit-wrap)
  - .admin-form > div:not(.admin-form-footer) grid exclusion guard (×3)
  - .admin-login-box .admin-form > div:not(.admin-form-footer) overrides (×2)
  - .admin-login-box .admin-form-footer compact spacing override
- No visual change; purely a semantic rename to a descriptive class name
- Also marked status-badge.php partial and WCAG 1.3.1 badge tasks as
  already-done in todo/02-php-components.md and todo/04-accessibility.md
  (partial + CSS were fully implemented but todo had not been updated)

todo/02-php-components.md

@@ -11,7 +11,7 @@
 ## Shared UI partials — `templates/partials/`
 
 - [x] **`pagination.php`** — partial created and used in both `search.php` and (now) `admin/index.php`; `admin/index.php` also gained proper server-side pagination (25/page) with filter-aware `$baseParams`
-- [ ] **`status-badge.php`** — published/pending badge + access badge pattern repeated in `index.php` admin table rows; extract into a partial
+- [x] **`status-badge.php`** — partial fully implemented (`templates/partials/status-badge.php`) with `$badgeType`/`$badgeValue` API; CSS rules in `admin.css`; used in `admin/index.php` for publish + access badges
 - [ ] **`admin-alert.php`** — rename/merge `flash-messages.php` to also handle the 3 different legacy flash key patterns (`$_SESSION['error']`, `$_SESSION['admin_error']`, `$_SESSION['edit_error']`, etc.) that pages still consume manually instead of via `App::consumeFlash()`
 
 ## Controller Extraction (In Progress)