Chore/165 upgrade to react 19 #167
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build: 🔒 update react to 19; make security updates incl. axios
Made other updates and changes as required to work with React 19,
most significantly updating @material-ui to @mui (Material v5).
Also updatded testing-library packages and made them dev-dependencies.
Bootstrap required Header properties to maintain appearance.
Made security updates to axios and web-vitals, unrelated to React 19.
test: add snapshot test of Header
Added snapshot test of Header to catch broken classes
seen after React update for #165.
Tested the test; it successfully catches reversion of the Header fix.