Dynamic Content for Elementor v3.4.13 Plugin

What’s New (Changelog) in Dynamic Content for Elementor v3.4.13

* Improvement - Settings → Indexing: combined section intro with scannable structure (benefit, when to use, warning, maintenance).
* Improvement - Pricing: `calculate_appointment_cost()` can skip `is_appointable()` for display-only quotes — post `wc_appointments_field_quote_only` or filter `woocommerce_appointments_calculate_cost_validate_appointable`; add-to-cart still validates separately.
* Performance - Removed ~1 MB of unused Moment.js from storefront scripts.
* Dev - PHPStan: third-party and WP-CLI stubs, admin include `@var` docblocks, Sprint 5–6 cleanup — baseline cleared (0 suppressed errors).
* Fix - REST API: allowlist availability `filter` column keys before SQL (closes unauthenticated injection on public `/availabilities`).
* Fix - Storefront timezone **Default**: persist site-timezone choice via `appointments_use_site_timezone` (not a fixed IANA string); custom zones still use `appointments_time_zone`; first visit uses timezone AJAX.
* Fix - Availability / slots: past-date guard uses Fake UTC civil day (`gmdate`, not `wp_date`) for minute/hour tokens; day/month posts omit `_time` so same-day all-day add-to-cart is not rejected after midnight; legacy timed data stores the same Fake UTC instant as listed slots.
* Fix - Availability rules: initialize `$rule_val` each iteration; `offsetSet( 'id', … )` assigns the posted id (was parameterless `set_id()`).
* Fix - Pricing: multi-day day-unit totals sum each civil day in the span (checkout uses same per-day engine as slot preview; PAO duration flat prices skipped when already billed per day).
* Improvement - Recurring package footer: single cost summary list (no duplicate Total/Due today on prepaid); session count under the hero price; deposits excluded from package preview (matches admin). Series preview summary no longer returns deprecated `checkout_footer_html` (use `total_price_html` only).
* Fix - Per-day inventory: in-cart recurring `session_starts` occupancy included when marking civil days sold out (calendar/conflict checks match slots overlap index).
* Fix - Storefront: unavailable `?time=HHMM` shows selected time with "(Selected time is unavailable)" instead of auto-picking first slot.
* Fix - Admin add appointment: reject missing posted date before parsing year/month/day.
* Fix - Admin panel: create panel anchors beside the calendar slot when **Add New Appointment** is opened first and a date/time is picked afterward (clear centered mode on calendar trigger).
* Fix - Admin product staff panel: fix assign-staff AJAX scope (`$staff_base_cost`, `$staff_qty`) and staff view `self::` call (`WC_Appointments_Admin::get_appointment_staff()`).
* Fix - Google Calendar: sync errors log exception messages; HTTP backoff returns explicit error when retry loop exits without a response.
* Fix - Partial refunds: each reduced-qty appointment keeps the correct per-line-item `$remaining_qty`.
* Fix - Series My Account: invalid action redirect no longer leaves `$result` / `$notice` undefined.
* Fix - Helpers: remove undefined `$gmt_offset` / `$cart_item` reads in `wc_appointment_get_timezone_offset()` and `wc_appointment_pretty_addon_duration()`.
* Fix - Privacy: exporter registration returns exporters array from `register_exporters()`.
* Fix - CRM integration: initialize note strings before appending comment HTML.
* Fix - Webtomizer deposits: check `$appointment_ids` array before updating partial-payment status.
* Fix - Product Vendors integration: declare `global $wp_roles` before role cap setup.
* Fix - Follow-Up Emails: pass `null` appointment to variable-replacement filter when queue item has no appointment context.
* Fix - Admin calendar: server preload always spans prev/current/next month grids regardless of default view (day/week/month/list), so switching views serves preloaded appointments instantly instead of refetching via REST.
* Fix - Availability rules: priority input fills column width on global (Settings → Appointments) and staff availability tables (site and synced tabs).