[Bug] Multiple [inx-search-form] instances share/update "number of matches" across unrelated submit buttons

[tobaco]

Summary

With multiple inx-search-form shortcodes on one page, changing form A updates the submit-button match count in form B/C as well.

Expected

Each submit button should show only the count of its own form (form-index scoped).

Actual

Counts are updated across unrelated forms.

Reproduction

1. Add 2+ inx-search-form shortcodes to one page.
2. Change filters in one form.
3. See submit-button counts changing in other forms too.

Suspected cause

In src/js/property_search.js:

• Count update listener is attached globally:
  • $('.inx-property-search').on('search:change', ...)
• Count update also writes a global fallback:
  • inx_state.search.number_of_matches = response.data (for formIndex === 0)
• This can leak count state between form instances despite form-index.