Release (v1.4.0): link previews, connection reliability and QR improvements - #113

New features

• linkPreview: Text messages can now include link previews with the page title, description and image. Supports previews for bare domains such as www.site.com. Preview failures gracefully fall back to a small card or plain text without failing the message.

Fixes

• Connect endpoints now return 200 while QR code generation is still in progress instead of returning 500 after the wait window expires;
• QR and pairing-code generation now use independent timeouts;
• Instance lookup no longer crashes the process when Redis is unavailable;
• linkPreview now blocks internal/private destinations and protects image uploads with the preview timeout.

Dependencies / Performance

• golang.org/x/image added for the link card thumbnail resize;
• Regenerated the Swagger contract for the new API changes.

Tests

• Added 659 lines of unit tests covering link previews, URL safety guards, QR generation and pairing-code timeout behavior.