release(7.0.0): updated release notes & version

[GitToTheHub]

Platforms affected

• Android
• iOS

Motivation and Context

• Fixes layout issues with XCode 26 and iOS 26
• Fixes a layout issue on Android, when the footer is displayed
• Fixes problems with the beforeload event
• Fixes: Cookies were persisting despite clearcache/clearsessioncache options because navigation started before async clearing operations finished, causing a race condition.
• Cleanup, refactoring and more
• Updated version headings on README.md to second level ## instead of third level ###

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[NiklasMerz]

Version bump looks good.

Updating the changelog format should be discussed and consistent.

[NiklasMerz]

I like the new format you introduced here. If we keep doing that for every new release let's go for it.