fix(docs): use v2 Svelte documentation domain

[dancormier]

Summary

• point V2 Svelte documentation links at v2.svelte.stackoverflow.design
• generate V2 LLM documentation and story links with the V2 hostname
• document installation through the compatible legacy-v2 npm tags
• use Netlify’s BRANCH value in extractor logging

Jira

STACKS-855

Verification

The current Netlify configuration does not create a stacks-svelte deploy preview for this branch. Verify the generated V2 site locally:

1. Install and build using the environment Netlify will supply for v2:

   npm ci
   BRANCH=v2 CONTEXT=branch-deploy npm run storybook:build -w packages/stacks-svelte

2. Serve the generated output:

   python3 -m http.server 4173 --directory packages/stacks-svelte/netlify/dist

3. Open these representative pages:

   • Getting Started documentation
   • Avatar component story
   • Generated LLM documentation

4. Confirm:

   • the documentation and component story render with their assets;
   • the browser console has no errors or failed asset requests;
   • Getting Started recommends @stackoverflow/stacks-svelte@legacy-v2 and @stackoverflow/stacks@legacy-v2;
   • public documentation links identify v2.svelte.stackoverflow.design;
   • documentation and story links in llms.txt use https://v2.svelte.stackoverflow.design.

5. Verify the documented npm aliases:

   npm view @stackoverflow/stacks-svelte@legacy-v2 version
   npm view @stackoverflow/stacks@legacy-v2 version

   Expected results:

   0.7.0
   2.9.0
   

Accessibility

No semantic or interaction changes. Svelte lint completed with no errors and nine existing Popover warnings.

Changeset

Not required. This changes documentation for the maintained V2 release.

Deployment

This PR does not change live Netlify settings. Its merged commit is a prerequisite for enabling the V2 branch deployment and domain.

[changeset-bot]

⚠️ No Changeset found

Latest commit: d21a5bc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

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[netlify]

✅ Deploy Preview for stacks ready!

Name	Link
🔨 Latest commit	d21a5bc
🔍 Latest deploy log	https://app.netlify.com/projects/stacks/deploys/6aa9b7b88256ec0008ff701e
😎 Deploy Preview	https://deploy-preview-2401--stacks.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.
🤖 Make changes	Run an agent on this branch

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