feat: leads QR UX — merged confirm modes, faster scanning, correct capture identity

- Merge Rapid + Qualify scan modes into single Confirm mode with two-button card:
  "Add & Scan Next" (resets) and "Add & View Lead" (navigates to detail). Same
  two-button pattern on the reenable card: "Restore & Scan Next" / "Restore & View Lead".
  Stale 'qualify' localStorage values normalized to 'rapid' via $derived.by().
- QR scanner speed: fps 10→25, qrbox 82%→88%, useBarCodeDetectorIfSupported (native
  BarcodeDetector API on Chrome/Edge — significantly faster than ZXing JS fallback)
- Fix capture identity stored in external_person_id / group:
  licensed exhibit user → their email; shared passcode → 'shared_passcode' label
  (not the raw passcode); Aether user bypassing exhibit sign-in → access_type string
  ('trusted', 'manager', 'super', etc.). Consistent across all three lead capture
  components (single scanner, multi scanner, manual search).

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

src/routes/events/[event_id]/(badges)/badges/[badge_id]/ae_comp__badge_obj_view.svelte

@@ -186,7 +186,7 @@
         if (layout === 'badge_3.5x5.5_pvc') {
             // 3.5" × 5.5" PVC card — single-sided, compact
             return {
-                grp_name_title:      '1.8in',
+                grp_name_title:      '1.6in',
                 grp_name_title_flex: 'around',
                 name:                '1.4in',
                 title:               '0.55in',
@@ -446,7 +446,7 @@
             m-0 p-0
             px-1
             overflow-clip
-            flex flex-col gap-1
+            flex flex-col
             items-stretch justify-between
             "
             >