Add contextual user guide help buttons across mapped pages and dialogs

[apodacaduron]

Description

Adds a reusable contextual help button and wires it to relevant Bayanat docs pages across mapped admin pages/dialogs.
Also adds revision-history help links in entity cards and OCR help in media dashboard/transcription..

How to Test

1. Open mapped pages/dialogs (Bulletins, Actors, Incidents, Users, Roles, Activity, Import/Export, Media, Dynamic Fields).
2. Confirm help icon appears in toolbar and tooltip says Learn about .
3. Click help icon and verify it opens the expected docs.bayanat.org/guide/... page in a new tab.
4. Check entity cards (bulletin/actor/incident/location) have revision-history help next to log/history actions.

Jira ID (if applicable)

BYNT-1560

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-contextual-help-and-tooltips

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