feat(migrate): retarget ts/jsconfig at $app/tsconfig

[jycouet]

SvelteKit 3 no longer writes .svelte-kit/tsconfig.json - the generated config now lives at node_modules/$app/tsconfig and no longer carries include. Existing projects break on upgrade (e.g. better-auth can't read its config, the drizzle addon's typescript.config hook throws on config.include.push).

New tsconfig task in the sveltekit-3 migration:

• points extends at $app/tsconfig and gives the project its own include
• drops compiler options that just duplicate the generated ones
• moves paths added by the now-deprecated typescript.config hook into include, flagging hooks that do more

It will help: #1185

[pkg-svelte-dev]

Install the latest version of sv from 3cc2c44:

pnpm add https://pkg.svelte.dev/sv/c/3cc2c4402d373fbce92405ffbba32b70f2470658

Open in pkg.svelte.dev: https://pkg.svelte.dev/repos/cli/pr/1197

[changeset-bot]

🦋 Changeset detected

Latest commit: 3cc2c44

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

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sv	Minor

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[svelte-docs-bot]

Preview: https://svelte-dev-git-preview-cli-1197-svelte.vercel.app/