Replace rfdc & JSON.parse(JSON.stringify()) with structuredClone

package-lock.json

package.json

src/lib/components/ModificationsPanel.svelte

src/lib/components/parameters/ScaleEdit.svelte

src/lib/components/test_cases/TestCaseCompareModal.svelte

src/lib/components/test_cases/TestCaseGraph.svelte

src/lib/components/test_cases/TestCaseSummary.svelte

src/routes/+layout.svelte