Update app to SvelteKit static build with Oxc tooling

[Hashory]

Summary

• Migrate the UI from vanilla DOM code to SvelteKit with static adapter output.
• Update Vite to 8.x and declare Node >=22 with pnpm 10.33.0.
• Replace Biome with Oxfmt/Oxlint, including import sorting configuration.
• Add Dependabot plus CI checks for formatting, linting, and typechecking.
• Generate static robots.txt and sitemap.xml via prerendered SvelteKit endpoints.

Testing

• pnpm run format:check
• pnpm run lint
• pnpm run check
• pnpm run build
• pnpm run test

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Deploying a4toa3 with    Cloudflare Pages

Latest commit:	cd9ffed
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Branch Preview URL:	https://2026-04-12.a4toa3.pages.dev

View logs

[Copilot]

Pull request overview

This PR migrates the app from a vanilla Vite/DOM setup to a prerendered SvelteKit static build, updates the toolchain (Vite 8 / Node 22 / pnpm 10), and replaces Biome with Oxc-based formatting/linting, alongside new CI + Dependabot automation.

Changes:

• Replace the vanilla DOM UI with a SvelteKit (Svelte 5) UI, using adapter-static prerender output.
• Replace sitemap generation via Vite plugin with prerendered SvelteKit endpoints (/robots.txt, /sitemap.xml).
• Update tooling and automation: Vite 8, TypeScript 6, oxfmt/oxlint, Dependabot, and a CI workflow.

Reviewed changes

Copilot reviewed 20 out of 23 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
vite.config.ts	Switch Vite config to SvelteKit plugin.
tsconfig.json	Adopt SvelteKit-generated tsconfig base and simplify compiler options.
svelte.config.js	Configure adapter-static output to build/ with strict prerendering.
src/routes/+layout.ts	Enable prerendering and configure trailing slash behavior.
src/routes/+layout.svelte	Move global body styling into the SvelteKit layout.
src/routes/+page.svelte	Implement the UI in Svelte (file selection, mode selection, conversion, download).
src/routes/robots.txt/+server.ts	Add prerendered robots.txt endpoint.
src/routes/sitemap.xml/+server.ts	Add prerendered sitemap.xml endpoint.
src/app.html	Add SvelteKit app template (HTML shell).
src/core.ts / src/core.test.ts	Keep conversion logic; apply formatting-only changes in core + tests.
package.json / pnpm-lock.yaml	Add SvelteKit + Oxc tooling, bump Vite/TS/Vitest, set Node/pnpm engines.
.oxlintrc.json / .oxfmtrc.json	Add Oxlint/Oxfmt configuration (including import sorting).
.github/workflows/ci.yml	Add CI workflow for format/lint/typecheck.
.github/dependabot.yml	Add Dependabot for npm + GitHub Actions.
.gitignore	Ignore SvelteKit build artifacts and preview logs.
index.html / src/main.ts / src/style.css / biome.json	Remove legacy entrypoint/style and Biome config.
README.md	Minor formatting tweaks.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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