Filings UI: Digital Business Card tasks for entities UI upgrades

When Entities UI's (create/filings/edit UI) are upgraded from Vue to Nuxt, work is needed to ensure that Digital Business Card continues to work. Information is required on the tasks that are needed.

The DBC functionality on the UI is contained in [business-filings-ui](https://github.com/bcgov/business-filings-ui/). If the Filings UI is to get migrated out of the current Vue 2 architecture then the DBC code that lives in there would need to be taken into account.

One decision point would be based on finding out which of the following strategies is going forward for moving Filings from Vue2 to Nuxt (assume that's the case)

1. Is "Filings UI" moving forward as a frontend project/component? If so, is DBC functionality be shifted along with that project.
2. or, should DBC be shifted into it's own standalone component separate from Filings. Or is this a necessity anyways if the Filings UI ceases to exist as a grouped project, but Filings are moved elsewhere. **[LO: Having a standalone Nuxt DBC web project/component/whatever seems to me the best/cleanest thing if possible from an encapsulation and separation-of-concerns aspect. It has nothing to do with Filings]** If separating out, this could _probaby_ (haven't verified) be done prior to shifting filings UI over as a standalone task, reducing the scope of a Filings UI shift.

Most of the relevant code is under `src/components/DigitalCredentials/` in Filings UI.

Note there is an LD flag for the ui that gates the entire DBC as an on/off in the frontend: `enable-digital-credentials`
There is `getAllowedActions.digitalBusinessCard` from the backend (which bases decision on business logic and additional LD flags) as well.

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Note for other UIs that have any DBC reference should they need adjusting (unlikely in scope with this ticket):
- **business-dashboard-ui**: `LinkActions.vue` exposes the "Digital Business Card" link that links out to `/filings/{businessId}/digital-credentials/`. Same LD flag + allowed action check as filings UI.
- **business-ui** base layer: just defines LDFlag.EnableDigitalCredentials. No usage.

Review business-filings-ui, especially src/components/DigitalCredentials/, and trace the enable-digital-credentials flag and getAllowedActions.digitalBusinessCard checks. Also inspect business-dashboard-ui's LinkActions.vue for related references. Document whether DBC should move with Filings UI or become a standalone Nuxt component, and list the migration tasks and flag/action behavior that must remain supported.

Written by the indexing model from the issue text.