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/lib/ae_events/ae_events__exhibit.ts

@@ -309,9 +309,9 @@ export async function create_ae_obj__exhibit({
 }): Promise<ae_EventExhibit | null> {
 	const result = await api.create_nested_obj_v3({
 		api_cfg,
-		for_obj_type: 'event',
-		for_obj_id: event_id,
-		obj_type: 'event_exhibit',
+		parent_type: 'event',
+		parent_id: event_id,
+		child_type: 'event_exhibit',
 		fields: { ...data_kv },
 		log_lvl
 	});
@@ -353,10 +353,10 @@ export async function update_ae_obj__exhibit({
 }): Promise<ae_EventExhibit | null> {
 	const result = await api.update_nested_obj_v3({
 		api_cfg,
-		for_obj_type: 'event',
-		for_obj_id: event_id,
-		obj_type: 'event_exhibit',
-		obj_id: exhibit_id,
+		parent_type: 'event',
+		parent_id: event_id,
+		child_type: 'event_exhibit',
+		child_id: exhibit_id,
 		fields: data_kv,
 		log_lvl
 	});

src/lib/ae_events/ae_events__exhibit_tracking.ts

@@ -326,9 +326,9 @@ export async function create_ae_obj__exhibit_tracking({
 }): Promise<ae_EventExhibitTracking | null> {
 	const result = await api.create_nested_obj_v3({
 		api_cfg,
-		for_obj_type: 'event_exhibit',
-		for_obj_id: exhibit_id,
-		obj_type: 'event_exhibit_tracking',
+		parent_type: 'event_exhibit',
+		parent_id: exhibit_id,
+		child_type: 'event_exhibit_tracking',
 		fields: {
 			event_badge_id: event_badge_id,
 			external_person_id,
@@ -374,10 +374,10 @@ export async function update_ae_obj__exhibit_tracking({
 }): Promise<ae_EventExhibitTracking | null> {
 	const result = await api.update_nested_obj_v3({
 		api_cfg,
-		for_obj_type: 'event_exhibit',
-		for_obj_id: exhibit_id,
-		obj_type: 'event_exhibit_tracking',
-		obj_id: exhibit_tracking_id,
+		parent_type: 'event_exhibit',
+		parent_id: exhibit_id,
+		child_type: 'event_exhibit_tracking',
+		child_id: exhibit_tracking_id,
 		fields: data,
 		log_lvl
 	});