feat(leads): V3 API migration, QR Scanner v3, and Exhibitor Leads UI overhaul

- Migrate event_exhibit and event_exhibit_tracking CRUD to V3 API (parent_type/child_type params).
- Implement Element_qr_scanner_v3.svelte: A Svelte 5 / Runes component using html5-qrcode with auto-start and unique viewfinder IDs.
- Integrate QR Scanner v3 into ae_comp__badge_search.svelte and lead capture.
- Refactor Exhibitor Leads UI:
  - Add 'Rapid Scan' vs 'Qualify Mode' toggles for efficient lead capture.
  - Upgrade ae_comp__lead_detail_form.svelte to support new question/response schema with backward compatibility.
  - Implement 'Sign Out of Booth' functionality in exhibit management.
  - Optimize lead detail layout for mobile readability and high information density.
  - Fix component prop sync for event_id and exhibit_id.
- UI/UX refinements: standardizing icons (SquarePen), cleaning up unused imports, and improving responsive states.

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

@@ -10,16 +10,14 @@
     import {
         Library,
         RemoveFormatting,
-        X,
         QrCode,
         Search,
-        Check,
         LoaderCircle
     } from 'lucide-svelte';
 
     import { ae_loc, ae_api } from '$lib/stores/ae_stores';
     import { events_loc, events_sess } from '$lib/stores/ae_events_stores';
-    import Element_qr_scanner_v2 from '$lib/element_qr_scanner_v2.svelte';
+    import Element_qr_scanner_v3 from '$lib/element_qr_scanner_v3.svelte';
     import { ae_util } from '$lib/ae_utils/ae_utils';
 
     // ISHLT 2024 badge type codes
@@ -53,7 +51,7 @@
         };
     }
 
-    function handle_qr_scan_result(event: CustomEvent) {
+    function handle_qr_scan_result(event: { detail: { result: string; entry_method: string } }) {
         let qr_scan_result = event.detail.result;
         let obj = ae_util.process_data_string(qr_scan_result);
 
@@ -202,9 +200,9 @@
         <div
             class="w-full max-w-2xl mx-auto p-4 bg-surface-100-900 rounded-lg shadow-lg"
         >
-            <Element_qr_scanner_v2
+            <Element_qr_scanner_v3
                 bind:start_qr_scanner={$events_sess.badges.qr_scan_start}
-                on:qr_scan_result={handle_qr_scan_result}
+                on_qr_scan_result={handle_qr_scan_result}
             />
         </div>
     {/if}
@@ -240,24 +238,7 @@
             </button>
         {/if}
 
-        <button
-            type="button"
-            onclick={() => {
-                $events_loc.badges.use_id_li = !$events_loc.badges.use_id_li;
-                handle_search_trigger();
-            }}
-            class="btn btn-sm preset-tonal-secondary border border-secondary-500"
-            title="Toggle using the ID list or not."
-        >
-            {#if $events_loc.badges.use_id_li}
-                <Check size="1.2em" class="text-green-600 mr-1" />
-            {:else}
-                <X size="1.2em" class="text-red-600 mr-1" />
-            {/if}
-            Use ID List
-        </button>
-
-        {#if $ae_loc.edit_mode}
+{#if $ae_loc.edit_mode}
             <label
                 class="flex items-center gap-1 cursor-pointer bg-surface-200-800 px-2 py-1 rounded-token text-xs font-semibold"
             >