refactor: clean up try_cache defaults and add SWR to sponsorship loaders

- Remove vestigial try_cache param from generate_qr_code (never used in body)
- Remove vestigial try_cache from ae_core_functions: load_ae_obj_id__site_domain,
  update_ae_obj_id_crud, update_ae_obj_id_crud_v2 (none referenced it in body)
- Add proper SWR pattern to load_ae_obj_id__sponsorship_cfg and
  load_ae_obj_id__sponsorship; change defaults from false to true
- Change load_ae_obj_id__event_file default try_cache from false to true
  (consistent with load_ae_obj_li__event_file)
- Change load_ae_obj_id__hosted_file default try_cache from false to true
  (consistent with load_ae_obj_li__hosted_file)
- Remove stale try_cache arg from element_ae_crud.svelte caller

src/lib/ae_core/ae_core_functions.ts

@@ -52,13 +52,11 @@ const ae_promises: key_val = {}; // Promise<any>;
 async function load_ae_obj_id__site_domain({
     api_cfg,
     fqdn,
-    try_cache = false,
     timeout = 7000,
     log_lvl = 0
 }: {
     api_cfg: any;
     fqdn: string;
-    try_cache?: boolean;
     timeout?: number;
     log_lvl?: number;
 }) {
@@ -273,7 +271,6 @@ async function update_ae_obj_id_crud({
     field_name,
     new_field_value,
     params = {},
-    try_cache = false,
     log_lvl = 0
 }: {
     api_cfg: any;
@@ -282,9 +279,8 @@ async function update_ae_obj_id_crud({
     object_reload?: boolean;
     field_name: string;
     new_field_value: any;
-    params: any | key_val;
-    try_cache: boolean;
-    log_lvl: number;
+    params?: any | key_val;
+    log_lvl?: number;
 }) {
     let patch_result: any = null;
 
@@ -365,7 +361,6 @@ async function update_ae_obj_id_crud_v2({
     field_name,
     new_field_value,
     params = {},
-    try_cache = false,
     log_lvl = 0
 }: {
     api_cfg: any;
@@ -375,7 +370,6 @@ async function update_ae_obj_id_crud_v2({
     field_name: string;
     new_field_value: any;
     params?: any | key_val;
-    try_cache?: boolean;
     log_lvl?: number;
 }) {
     if (log_lvl) {

src/lib/ae_core/core__hosted_files.ts

@@ -12,7 +12,7 @@ export async function load_ae_obj_id__hosted_file({
     api_cfg,
     hosted_file_id,
     view = 'default',
-    try_cache = false,
+    try_cache = true,
     log_lvl = 0
 }: {
     api_cfg: any;

src/lib/ae_core/core__qr_code.ts

@@ -19,7 +19,6 @@ export async function generate_qr_code({
     obj_id,
     str, // For encoding a string (like a URL) into a QR code.
     return_blob = true, // blob or url?
-    try_cache = false,
     log_lvl = 0
 }: {
     api_cfg: any;
@@ -31,7 +30,6 @@ export async function generate_qr_code({
     obj_id?: string;
     str?: string;
     return_blob?: boolean;
-    try_cache?: boolean;
     log_lvl?: number;
 }) {
     if (log_lvl) {