Review the Portuguese translation catalogue as a native speaker

[ralleur]

Goal

Review the Portuguese interface catalogue as a native speaker so the first public beta uses natural, consistent wording.

Scope

• Review app/messages/pt.json against app/messages/en.json and app/messages/de.json.
• State whether the review targets European or Brazilian Portuguese and keep the choice internally consistent.
• Cover setup, room/device management, connection errors and normal panel/phone navigation.
• Preserve every key, placeholder and formatting marker exactly.
• Do not change product behaviour or add new messages in this issue.

Acceptance criteria

• The target Portuguese variant is stated in the pull request.
• Every Portuguese key has been reviewed in context.
• Placeholders and message structure still match the source catalogues.
• Terminology for Home Assistant, rooms, devices, setup and actions is consistent.
• cd app && npm test passes.
• cd app && npm run check passes.
• The Portuguese locale is smoke-tested in the app with no visibly truncated setup labels.