chore(next): release 0.13.0

[github-actions]

🤖 I have created a release beep boop

0.13.0 (2026-08-04)

Features

• add email body cleanup job to remove old email content after 90 days (cef8ce0)
• api: insert steps mid-transition and validate connections (6343ef5)
• classify emails and build headers based on email type (8f23d8a), closes #411
• hide signup link from login when DISABLE_SIGNUPS is set (21ea0b8)
• i18n: add Swedish (sv) translations (1fbaccc)
• i18n: add Swedish (sv) translations (bdd5ab7)
• implement idempotency for POST /v1/track and POST /v1/send with cleanup job (94c85ac)
• insert, disconnect and reconnect steps in the workflow editor (aa4b011)
• web: insert, disconnect and reconnect steps in the workflow editor (68cd243)
• web: scope email editor 'Preview as' to the campaign's segment (abef349)
• web: scope email editor 'Preview as' to the campaign's segment (184f019)

Bug Fixes

• refine date filtering logic for activity feeds and pagination (3b86873)

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