chore: remove trailing slashes from URL environment variables

[Copilot]

Widget connections fail when REACT_APP_WIDGETS_URL ends with a trailing slash, causing double-slash artifacts in constructed URLs (https://example.com//path).

Changes

• Added removeTrailingSlash() utility to strip trailing slashes from URL strings
• Applied to REACT_APP_WIDGETS_URL, REACT_APP_DAPP_VIEW_MODE, and REACT_APP_DR_CENTER_VIEW_MODE at config load time

Implementation

export function removeTrailingSlash(url: string | undefined): string {
  if (!url) return "";
  return url.endsWith("/") ? url.slice(0, -1) : url;
}

const widgetsUrl = removeTrailingSlash(process.env.REACT_APP_WIDGETS_URL);

Normalizes https://widgets.bosonprotocol.io/ → https://widgets.bosonprotocol.io before use in iframe src construction and origin checks.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Env variables that link to website URL should not end with "/". Ensure the "/" is removed in the code, if any.</issue_title>
<issue_description>when setting
REACT_APP_WIDGETS_URL=https://widgets.bosonprotocol.io/
instead of
REACT_APP_WIDGETS_URL=https://widgets.bosonprotocol.io
the connection with widget is not working well.

Make the necessary changes in the code so that the "/" is removed at the end of the variable value, in case it exists
This has to be done with the following env vars:

• REACT_APP_WIDGETS_URL
• REACT_APP_DAPP_VIEW_MODE
• REACT_APP_DR_CENTER_VIEW_MODE

This could be done in the file 'src\lib\config.ts', when the env var values are read and copied into the CONFIG object
</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Env variables that link to website URL should not end with "/". Ensure the "/" is removed in the code, if any. #1158

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