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xchainjs-lib
Lightweight typescript library for cross-chain wallets. Connect with multiple blockchains via a common interface, with support for the minimum features necessary.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
Just to clarify, I haven't looked at the ThorSwap code in a while, but you're not sending your keystore file + password to their server. For keystores, all the magic is done via https://github.com/xchainjs/xchainjs-lib on the frontend. I believe XDEFI is using the same library. Transactions are signed frontend and sent to their respective chains. That said, I feel bad for OP, and not sure how they were hacked. If the keystore was created on ThorSwap, it's definitely worth bringing it up on their Discord. But just to affirm, using a hardware wallet is preferable.