feat: leads re-enable flow — detect removed leads on scan + Remove/Restore buttons

- QR scanner (single + multi): detect previously-removed leads via IDB enable flag;
  route to 'reenable' state instead of duplicate error; offer Re-activate button
- API fallback: if create fails and no IDB record, search API for disabled tracking
  record by event_exhibit_id + event_badge_id (adds qry_badge_id param to
  search__exhibit_tracking)
- Lead detail page: Replace raw enable checkbox with Remove Lead (two-click confirm,
  navigates back after) and Restore Lead card (shown when enable is falsy)
- Fix flash of disabled records in leads list: filter !enable in both filtered_lead_li
  derived and local IDB fast-path in handle_search_refresh
- eslint.config.js: disable svelte/no-navigation-without-resolve (no base path configured)
- Also includes _random field annotation cleanup (db_events, ae_types), iframe layout
  fixes, badge view tweaks, test updates, and doc updates from prior session

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

eslint.config.js

@@ -32,7 +32,9 @@ export default tseslint.config(
     },
     {
         rules: {
-            '@typescript-eslint/no-unused-vars': 'warn'
+            '@typescript-eslint/no-unused-vars': 'warn',
+            // No base path configured — this rule is not applicable to this project
+            'svelte/no-navigation-without-resolve': 'off'
         }
     }
 );