Use Vite for dev builds - now with HMR!

[ivan-jukic]

This PR introduces Vite as our solution for running dev builds. It provides an "out-of-the-box" hot module replacing, which should help us build those new UI features much quicker.

There is quite a few changes in this PR, but the gist is that they're quite relevant for making us faster.

There is also a number of "fixes", that align the codebase with the latest syntax, and some improvements like the ability to alias imports, which might be easier to reconcile than relative paths.

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Screencast.From.2025-02-03.19-49-06.webm

Video shows random changes and how they are immediately reflected in the browser when using Vite+HMR This would take about 3+ minutes to compile and preview with our current setup.

[github-actions]

canbench 🏋 (dir: .)

./canbench_results.yml is up to date ✅

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Benchmark: push_simple_text_messages
  total:
    instructions: 223.47 M (-0.20%) (change within noise threshold)
    heap_increase: 12 pages (no change)
    stable_memory_increase: 0 pages (no change)

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Benchmark: add_reactions
  total:
    instructions: 891.68 M (-1.27%) (change within noise threshold)
    heap_increase: 3 pages (no change)
    stable_memory_increase: 0 pages (no change)

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