fix: dealt with var declarations in bracket issue

[ngtr6788]

"Successor" to #8442, fixes #6706 (because I closed it and deleted the branch)

This PR simplifies the solution done in the previous PR, up to date with version 4, and keeps most of the tests. However, I do not expect this PR to be merged, as per #8442, it is best to hold off until version 5. Therefore, this PR would be more of a reference for potential version 5 compiler output overhaul on how to solve this issue, so feel free to put this in One Day, I don't really mind.

HEADS UP: BIG RESTRUCTURING UNDERWAY

The Svelte repo is currently in the process of heavy restructuring for Svelte 4. After that, work on Svelte 5 will likely change a lot on the compiler aswell. For that reason, please don't open PRs that are large in scope, touch more than a couple of files etc. In other words, bug fixes are fine, but feature PRs will likely not be merged.

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
• Prefix your PR title with feat:, fix:, chore:, or docs:.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with pnpm test and lint the project with pnpm lint

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[ngtr6788]

Will close this issue because of Svelte 5