Svelte Transitions break the back button

[Bob Walton]

Including svelte transitions in a child component of a Route throws runtime errors when you navigate back from that route.

Here's a REPL that repros the issue: https://svelte.dev/repl/fbf4cecab51842758c2e3e5a746a7dc3?version=3.50.1

1. Go to the REPL above
2. Click on 'Press for Error Test'
3. Press the back button
4. See error

Replicated on desktop:

• OS: MacOS 12.4
• Browser Safari
• Version 15.5

[Simon Conrad]

Append |local to the transition declaration (e.g. transition:fade → transition:fade|local). See also: https://svelte.dev/tutorial/local-transitions