chore(stores): remove unused default properties from ae_loc, ae_sess, events_slct, idaa_loc

Audited all three legacy persisted-store files for properties with zero
references in src/. Removed ~119 lines of dead defaults:

- ae_loc: qr_scanner_version, ds, entire mod block (archives/events/journals/posts/sponsorships)
- ae_sess: hub, mod block (archives/events/journals/posts/sponsorships/testing), download
- events_loc: ds
- events_sess: ds_loaded
- events_slct: abstract_*, badge_template_*, device_*, exhibit_tracking_*, lq__presenter_obj
- idaa_loc: ds, idaa_cfg_json, top-level qry__* (each submodule has its own), novi_rate_limited_until, novi_*_base_url (read from site_cfg_json, not idaa_loc)

No version bumps needed — removing fields from defaults is backwards-compatible.
svelte-check passes: 0 errors, 0 warnings.

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

src/lib/stores/ae_events_stores.ts

@@ -40,8 +40,6 @@ const events_local_data_struct: key_val = {
     name: 'Aether - Events',
     title: `OSIT's Æ Events`,
 
-    ds: {},
-
     events_cfg_json: {},
 
     event_id: null,
@@ -102,7 +100,6 @@ const events_session_data_struct: key_val = {
     ds: {
         submit_status: null
     },
-    ds_loaded: {},
 
     qry__enabled: 'enabled', // all, disabled, enabled
     qry__hidden: 'not_hidden', // all, hidden, not_hidden
@@ -162,31 +159,14 @@ const events_slct_obj_template: key_val = {
     event_obj_li: [],
 
     // Sub-level event_
-    abstract_id: null,
-    abstract_obj: {},
-    abstract_obj_li: [],
-
     badge_id: null,
     badge_obj: {},
     badge_obj_li: [],
 
-    badge_template_id: null,
-    badge_template_obj: {},
-    badge_template_obj_li: [],
-
-    device_id: null,
-    device_obj: {},
-    device_obj_li: [],
-
     exhibit_id: null,
     exhibit_obj: {},
     exhibit_obj_li: [],
 
-    // Rename these to badge_tracking_*?
-    exhibit_tracking_id: null,
-    exhibit_tracking_obj: {},
-    exhibit_tracking_obj_li: [],
-
     file_id: null,
     file_obj: {},
     file_obj_li: [],
@@ -218,8 +198,6 @@ const events_slct_obj_template: key_val = {
     session_obj_li: [],
     event_session_obj: {},
 
-    lq__presenter_obj: {}, // Testing passing a LiveQuery object around...
-
     auth__event_presenter_id: null,
     auth__event_presentation_id: null
 };