UI Design: Show total business count on MBR

https://www.figma.com/design/OaPfGKJAlUSdADsKGttn0M/My-Business-Registry?node-id=2080-1066

When MBR was updated to NUXT we lost the ability to use total number of businesses within the table. In lieu of that, we should show a static total count (number of business afiliated to this account) as well as the ability to show a running total based on filter settings but load it separately from the page. Only prompt for it if user selects some sort of button.

**Notes**
Rationale for Using a Static Total Count
- Supports key user tasks like audit, and verification (especially for law firms managing many businesses).
- Avoids performance issues caused by recalculating counts on every filter or search action.
- Reduces confusion compared to removing the count entirely, which may lead to uncertainty or support requests.

**Recommended Approach**
- Display a static total count once on page load (e.g., “356 businesses affiliated with this account”).
- Do not update the count dynamically when filters are applied.
- Optionally, offer a manual “Show filtered count” trigger for power users who need that detail on demand.