fix(llc): Fixed build in dart2wasm environment

[ebraminio]

According to https://dart.dev/interop/js-interop/past-js-interop we should now "prefer using dart:js_interop going forwards and migrate usages of old interop libraries when possible" and this change does that in order to make the library compatible with --wasm builds.

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Linear: FLU-

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CLA

• I have signed the Stream CLA (required).
• The code changes follow best practices
• Code changes are tested (add some information if not applicable): No test is added yet as support of --wasm on this project needs Avoid incorrect cast in sql_js in wasm builds simolus3/drift#3657 (already merged but not released) and Migrate to package:web Alberto-Monteiro/video_thumbnail#9 also but having all of them it's possible to make it in the CI also AFAICS.

Description of the pull request

When I'm building example of this project in flutter run -d chrome --wasm mode the web mode isn't recognized correctly and raises errors like this on the console

Which this change fixes

Summary by CodeRabbit

• Bug Fixes

  • Fixed web build issues (including dart2wasm) to improve stability for web users.

• Refactor

  • Standardized web platform detection and handling across core, attachment handling, and persistence layers.

• Chores

  • Aligned web targeting with current Dart/Flutter tooling for broader browser compatibility.
  • No public API changes.