perf: monorepo improvements

[Hugos68]

Improves monorepo performance:

• Use rolldown-vite
• ...

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Latest commit: 9f69f47

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Project	Deployment	Preview	Updated (UTC)
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[Hugos68]

@copilot Can you create a PR against this branch that removes all uses of @/ paths alias inside all packages/* projects, this PR removes the aliases as prep for some upcoming stuff. Just grep @/ inside import paths in pacakges/* and replace them with the correct relative path instead.

[Copilot]

@Hugos68 I've opened a new pull request, #4136, to work on those changes. Once the pull request is ready, I'll request review from you.

[Hugos68]

@copilot This PR moves from testing library to vitest browser mode, please update every test to use vitest browser mode setup:
test('UserProfile handles loading and data states', async () => {
const { getByText } = render()

// Test loading state
await expect.element(getByText('Loading...')).toBeInTheDocument()

// Test for data to load (expect.element auto-retries)
await expect.element(getByText('User: John')).toBeInTheDocument()
})

[Copilot]

@Hugos68 I've opened a new pull request, #4137, to work on those changes. Once the pull request is ready, I'll request review from you.

[Hugos68]

@copilot Your last PR migrated to vites tbrowser mode test setup which is great, but the render function is async, please make all tests that utilize render async and await the render call.

[Copilot]

@Hugos68 I've opened a new pull request, #4138, to work on those changes. Once the pull request is ready, I'll request review from you.

[Hugos68]

@copilot The svelte API actually doesn't need async, so remove any unneccesary ascyn or await keywordsa in the svelte package

[Copilot]

@Hugos68 I've opened a new pull request, #4139, to work on those changes. Once the pull request is ready, I'll request review from you.