Improve readability of workflow history entries

[shivaansh0610-LUFFY]

This change improves the readability of workflow-related history entries by
displaying explicit state transitions (previous → current state) instead of
raw transition titles, making the History view easier to understand.

Closes #6584

[mister-roboto]

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[mister-roboto]

@shivaansh0610-LUFFY you need to sign the Plone Contributor Agreement to merge this pull request.

Learn about the Plone Contributor Agreement: https://plone.org/foundation/contributors-agreement

If you have already signed the agreement, please allow a week for your agreement to be processed.
Once it is processed, you will receive an email invitation to join the plone GitHub organization as a Contributor.

If after a week you have not received an invitation, then please contact [email protected].

[shivaansh0610-LUFFY]

I’ve included the Towncrier changelog entry.

The other failing CIs (unit tests on 22.x/24.x) seem to be unrelated to this purely UI change.
I signed the Plone Contributor Agreement on Jan 21 and am waiting for processing.

Thanks!

[shivaansh0610-LUFFY]

This PR changes the rendered output of the History component, so snapshot updates are expected.

I tried updating the snapshots locally using Node 22 with a clean pnpm workspace install, but Vitest fails during Vite import analysis with @plone/registry resolution before tests execute (tests never start locally).

CI should be able to generate the correct snapshots.