Reliability and sharing fixes

Fixed

• Builder links now stick to the correct retention window.
• Expired artifacts are cleaned up more reliably.
• Support messages from the app now go to the right inbox.
• Public contact links now use the correct support address.
• Login and get started buttons now route correctly.

Improved

• Publishing now has clearer account limits to keep the service stable.
• Project links are better protected from very large or noisy updates.
• Activity tracking is less noisy when the same link is opened repeatedly.
• Failed storage cleanup is now retried automatically.

Why it matters

These updates keep BinHTML predictable for normal use while making it harder for edge cases or heavy automation to create unexpected storage, expiry, or inbox problems.