Update docs and examples with Svelte 5 references and syntax

[kaechele]

Changes

1. Adapts the SvelteKit example to Svelte 5 runes syntax.
2. Update dependencies
3. Move openapi-fetch to devDependencies (Svelte is a compiler and doesn't need openapi-fetch at runtime).
4. Remove unneeded @sveltejs/vite-plugin-svelte-inspector and tslib dependencies.
5. Update SvelteKit boilerplate to what would be generated by a current sv create invocation.
6. Consistently use async/await syntax.

also:

Update links to Svelte documentation in docs.

How to Review

1. pnpm check shows no errors for SvelteKit example.
2. pnpm dev still delivers a functioning example application.
3. SvelteKit example uses current Svelte and TypeScript best practices.

Checklist

• Unit tests updated
• docs/ updated (if necessary)
• pnpm run update:examples run (only applicable for openapi-typescript)

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[Copilot]

Pull Request Overview

This PR updates the SvelteKit example to match Svelte 5 syntax and conventions while also updating dependencies, configuration files, and documentation links.

• Adapt SvelteKit examples to new Svelte 5 patterns (e.g. use of PageLoad type, $props(), and $state()).
• Update dependency versions and move/removal of unneeded packages.
• Revise documentation links to point to the current Svelte documentation.

Reviewed Changes

Copilot reviewed 9 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/openapi-fetch/examples/sveltekit/tsconfig.json	Update compiler options and comment URLs to reflect current Svelte docs.
packages/openapi-fetch/examples/sveltekit/svelte.config.js	Update comment URLs for SvelteKit integrations.
packages/openapi-fetch/examples/sveltekit/src/routes/page-data/+page.ts	Update load function to use the PageLoad type and new URL syntax in comments.
packages/openapi-fetch/examples/sveltekit/src/routes/page-data/+page.svelte	Change to new reactive syntax with $props() and update comments; note update of event binding attribute.
packages/openapi-fetch/examples/sveltekit/src/routes/+page.svelte	Use async/await in onMount and update reactive state initialization; update event binding attribute.
packages/openapi-fetch/examples/sveltekit/package.json	Update dependency versions and adjust dependency grouping.
docs/*	Update documentation URLs to reflect Svelte 5 documentation.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (2)

packages/openapi-fetch/examples/sveltekit/src/routes/page-data/+page.svelte:16

• Svelte components typically use the 'on:click' directive for event binding instead of the standard 'onclick' attribute. Reverting to 'on:click' may ensure consistent event handling within Svelte.

  <button type="button" onclick={() => location.reload()}>Another fact!</button>

packages/openapi-fetch/examples/sveltekit/src/routes/+page.svelte:30

• Consider using Svelte's 'on:click' event binding syntax instead of the 'onclick' attribute to maintain consistency with Svelte best practices and framework reactivity.

  <button type="button" onclick={async () => (fact = await getFact())}>

[gzm0]

TY very much for taking the time to do this! Much appreciated.