chore: vite 5 test compatibility

[bluwy]

Fix some Vite 5 compat issues:

1. SVGs are now inline-able: A test was fetching an SVG path but it's data: now, so it's unfetch-able. I refactored to use large.png from the /asset-import route instead.
2. Rollup file name hash are now url-safe base64, so I updated the test to match that regex

https://rollupjs.org/migration/:

Otherwise, an obvious change is that Rollup now uses url-safe base64 hashes in file names instead of the older base16 hashes. This provides more hash safety but means that hash length is now limited to at most 22 characters for technical reasons.

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