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_idaa_stores.ts

@@ -23,30 +23,12 @@ const idaa_local_data_struct: key_val = {
     // Timestamp (ms since epoch) when the last successful verification occurred.
     // Used to cache verification results and avoid repeated Novi API calls.
     novi_verified_ts: null,
-    // If set to a ms timestamp, verification attempts should be skipped until this time.
-    // Used to honor rate-limits and Retry-After behavior.
-    novi_rate_limited_until: null,
     // Populated from $ae_loc.site_cfg_json at IDAA layout mount — not managed here.
     // See routes/idaa/(idaa)/+layout.svelte for the override logic.
     novi_admin_li: [],
     novi_trusted_li: [],
     novi_jitsi_mod_li: [],
 
-    novi_archives_base_url: 'https://www.idaa.org/idaa-archives',
-    novi_bb_base_url: 'https://www.idaa.org/idaa-bulletin-board',
-    novi_meetings_base_url: 'https://www.idaa.org/idaa-meetings',
-
-    ds: {},
-
-    idaa_cfg_json: {},
-
-    // all, disabled, enabled
-    qry__enabled: 'enabled',
-    // all, hidden, not_hidden
-    qry__hidden: 'not_hidden',
-    qry__limit: 20,
-    qry__offset: 0,
-
     archives: {
         enabled: 'enabled', // all, disabled, enabled
         hidden: 'not_hidden', // all, hidden, not_hidden