Downgrade dev tooling to svelte-3-compatible versions

[Copilot]

The lockfile on main was stale from when the project used svelte 4. The "legacy version bump" commit downgraded svelte to ^3.0.0 in package.json but left all dev tooling at svelte-4+-only versions (SvelteKit 2, svelte-preprocess 6, vite 5). The previous fix bumped svelte back to ^4.0.0 — this instead keeps svelte 3 and downgrades the tooling to match.

Dev dependency downgrades

• @sveltejs/kit: ^2.5.17 → ^1.0.0 (kit 1 supports svelte ≥3.54)
• @sveltejs/adapter-auto: ^3.2.2 → ^2.0.0
• @sveltejs/adapter-static: ^3.0.2 → ^2.0.0
• svelte-preprocess: ^6.0.1 → ^5.0.0 (v6 requires svelte 4+)
• vite: 5.3 → ^4.0.0 (kit 1 peers on vite 4)
• typescript: ^5.4.5 → ~5.4.5 (TS 5.5+ removed importsNotUsedAsValues/preserveValueImports that kit 1's generated tsconfig emits)

Config fix

svelte-preprocess 5 uses a default export; 6 introduced the named export:

// before (v6)
import { sveltePreprocess } from "svelte-preprocess";
// after (v5)
import sveltePreprocess from "svelte-preprocess";

Lockfile

Deleted stale lockfile and regenerated. Resolves to svelte 3.59.2, kit 1.30.4, vite 4.5.14. npm ci and npm run build both pass.

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[thinkle-iacs]

Sorry did you up the svelte version on Main? Main is meant for svelte 3-4 -- it's the svelte5 branch that needs a newer svelte. I'm wondering if I accidentally committed the lock file from the svelte5 branch into the main branch and that's the root problem?

[Copilot]

Pull request overview

Updates the repo’s Svelte devDependency spec to align with the existing lockfile resolution, preventing npm ci failures in the deploy-docs workflow on Node 20 / npm 10+ due to dependency spec/lock mismatch.

Changes:

• Bump devDependencies.svelte from ^3.0.0 to ^4.0.0 in package.json.
• Regenerate package-lock.json to synchronize root package metadata and dependency specs (including the Svelte range).

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated no comments.

File	Description
package.json	Updates Svelte devDependency range to allow the locked Svelte 4.x version.
package-lock.json	Syncs lockfile root metadata and dependency specs with package.json (including Svelte).

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