* fix(vue): initialized the 'app' variable earlier in the client.js script by assigning the 'appInstance' reference to it so that it is available for the later established 'astro:unmount' event listener
* Add changeset
* fix(vue): reverted the last change and instead moved the 'astro:unmount' event listener to inside of the 'if' statement where the 'app' variable is initialized
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Co-authored-by: Matt Kane <m@mk.gg>
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