Upgrade all Javascript dependencies

Changes which were needed after the upgrade:

• Replace vite-plugin-virtual (vite 8 incompatible) with vite’s built-in define for the buildTimeConfig injection

• tsconfig: drop deprecated baseUrl (TS 5+ resolves paths relative to tsconfig)

• Vitest 4: import defineConfig from vitest/config so test is valid in vite configs

• Zod 4: rename .errors to .issues, make ZodSchema a type-only import, drop the removed SafeParseReturnType

• Tighten/loosen generic casts in localStore to match stricter zod 4 inference

• ESLint 9 no-useless-assignment: remove redundant initializers and dead reassignments; disable the rule where Svelte’s reactive blocks confuse the analyser

• Svelte/eslint prefer-svelte-reactivity: disable for legacy Svelte usages of URL / Set

• Misc naming-convention and prefer-const fixes

👉 Workflow runs 👉 Branch on GitHub

Build looks fine.

Not directly related by I saw that the build is 2,745.98 kB │ gzip: 627.12 kB. Have you considered using dynamic imports to improve the initial load, or done any lighthouse testing?

I did some brief research, here are some relevant resources:

• https://web.dev/articles/vitals-spa-faq
• https://developer.chrome.com/docs/web-platform/soft-navigations-experiment

Rebase

Get rid of warnings in dev mode

Key Playwright browser cache on Playwright version

To avoid missing browsers in feature branches.

Pin npm version to stabilize lockfile

Update lockfile