feat(ui): rebuild all tools pages on Carbon Design System web components

- @carbon/web-components v2.50.0 via the IBM CDN (version-pinned);
  @carbon/styles CSS + IBM Plex Sans for tokens/typography
- landing: Carbon header + cds-tile tool cards
- fingerprint wizard: Carbon-styled form controls, cds-progress-bar scan
  progress, cds-tag badges, cds-inline-notification replacing swal
- cropper: cds-toast replacing toastr, cds-checkbox review reasons,
  cds-tag process badge; vue-croppa pad kept in the Carbon layout
- Bootstrap 4, swal, toastr and jQuery removed from all pages
- behavior frozen: same flows, endpoints, validation and copy

openspec/changes/archive/2026-10-01-carbon-ui-redesign/tasks.md

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+# Tasks
+
+- [x] 1. Retheme `style.css` on Carbon tokens (Plex, dark header, layers,
+  sharp corners); drop Bootstrap/swal/toastr/jQuery from all pages; load
+  pinned Carbon CDN artifacts + Plex + @carbon/styles CSS.
+- [x] 2. Rebuild the landing page (Carbon header + cds-tile tool cards).
+- [x] 3. Rebuild the fingerprint wizard with Carbon components (inputs,
+  dropdown, cds-progress-bar scan progress, cds-tag badges,
+  cds-inline-notification replacing swal); verify at 390/768/1280 via the
+  visual harness.
+- [x] 4. Rebuild the cropper page with Carbon components (cds-toast replacing
+  toastr, cds-checkbox reasons, cds-tag); verify at 390/768/1280.
+- [x] 5. Run unit tests + docker smoke; sync/archive the change and commit.