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/specs/tools-app/spec.md

@@ -0,0 +1,16 @@
+# Spec Delta: tools-app
+
+## ADDED Requirements
+
+### Requirement: Carbon Design System UI
+The tools pages SHALL be built on the Carbon Design System: Carbon web
+components (version-pinned via CDN) for buttons, notifications, toasts, tags,
+progress and tiles; Carbon-styled native form controls; IBM Plex Sans
+typography and Carbon color tokens for layout. Errors, confirmations and
+successes SHALL surface as Carbon notifications rather than ad-hoc alert
+dialogs.
+
+#### Scenario: Pages render with Carbon components
+- **WHEN** any tools page is opened
+- **THEN** its interactive controls are Carbon components (or Carbon-styled
+  native controls) and its notifications render as Carbon notifications