Delete manual transactions and sign-in fixes

A few fixes and one quality-of-life improvement we have wanted for a while.

Transactions

• Manual transactions can now be deleted on every plan, not just paid subscriptions
• The select-all checkbox was removed to prevent accidental bulk selection

Signing in

• Sign-in with multi-factor authentication and email verification codes is working again. We tried a custom sign-in form but it did not handle those flows correctly in production, so we switched back to Clerk's prebuilt component while keeping the custom forgot-password flow

Insights

• The Account Distribution Sankey diagram now stays inside its container instead of growing wider with each node, and category nodes have tighter padding so related items stay visually grouped

Bank connections

• When you relink a bank account, Copia now keeps your active connection instead of restoring a deleted one. If no active replacement exists, the deleted connection is still restored