Show unit ID on details page and in form (i18n)

[stefan-burke]

Summary

• Adds unit ID display on the unit details page using a localized label
• Renders the unit ID in the unit form for persisted records

Changes

UI

• In app/views/shared/_unit_details.html.erb: inserted a new list item showing the unit ID with label t("units.fields.id").
• In app/views/units/_form.html.erb: within the data fieldset, render the ID field via the existing display_field partial for :id.

i18n

• Uses i18n key units.fields.id for the label; ensure a translation exists for the target locale (e.g., en).

Tests

• Verify the details page shows the ID label and value
• Verify the edit form displays the ID field for persisted units

Notes

• No functional changes beyond exposing the unit ID in details and edit forms.

🌿 Generated by Terry

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📎 Task: https://www.terragonlabs.com/task/a2645f27-5d95-4124-9c23-9957af45b6bf