svelte memory leak repro

1. Run pnpm i then pnpm build
2. Serve the build output with pnpx serve dist
3. Preview the served application, open Chrome developer tools and navigate to the Memory tab.
4. Take a heap snapshot before doing anything.
5. Click the toggle button on the left of the app several times to simulate navigation (changing between components)
6. Take a new heap snapshot
7. Observe the memory usage increase that doesn't go away over time.