fix(web): apply WEB_DOCS_URL to mobile nav button and SEO artifacts

[yannickmonney]

Summary

Two follow-ups to #1686 caught when verifying the deployment:

1. Mobile-nav "Read Docs" button still hardcoded. The previous replace_all in feat(web): make docs URL configurable via WEB_DOCS_URL build arg #1686 only matched the desktop button because the mobile one inside the <div className="mt-2 flex flex-col gap-2"> block sits at a different indentation level. The bundle still ships a literal https://docs.tale.dev for the mobile menu. This commit switches it to DOCS_URL like the desktop sibling.

2. build-llms-artifacts.ts changes never reached production. The web Dockerfile only ran vite build + the server bundle — it never invoked scripts/build-llms-artifacts.ts, so services/web/public/robots.txt (a stale checked-in file containing Sitemap: https://docs.tale.dev/sitemap.xml) was what vite build copied into dist/. The npm build and dev scripts run the artifact builder before vite, so this is purely a Dockerfile inconsistency. Mirror that order in the Dockerfile.

Pre-PR checklist

• Ran bun run check — not run by author; please verify locally
• Updated services/platform/messages/{en,de,fr}.json — N/A
• Updated /docs/{en,de,fr}/ — N/A
• Ran bun run --filter @tale/web lint and bun run --filter @tale/web test — not run by author; please verify locally
• Updated README.md and translations — N/A

Test plan

• Build with WEB_DOCS_URL=https://tale.dev/docs. Confirm the bundled JS no longer contains the literal "https://docs.tale.dev" outside of the fallback constant declaration, and that dist/robots.txt's second Sitemap: line points at https://tale.dev/docs/sitemap.xml.
• Default build (no env): bundle and robots.txt still reference https://docs.tale.dev as before.

Summary by CodeRabbit

Release Notes

• Build Updates

  • Web build process now generates and includes additional site-related assets during the build phase.

• Mobile Navigation

  • The documentation link in mobile navigation is now configurable and can be customized through environment settings, replacing the previously hardcoded URL.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 43e32a43-132d-4d98-bbf7-067e6d2db66f

📥 Commits

Reviewing files that changed from the base of the PR and between 9b6ebb0 and 64a2482.

📒 Files selected for processing (2)

• services/web/Dockerfile
• services/web/app/components/layout/site-header.tsx

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📝 Walkthrough

Walkthrough

This PR extends the Docker build process for services/web to generate LLMS-related artifacts and sitemap/robots files before running Vite build, ensuring these assets are available in the final output. Additionally, the SiteHeader component's mobile documentation link is made configurable through the VITE_DOCS_URL environment variable instead of using a hardcoded URL.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the two main changes: applying WEB_DOCS_URL to the mobile nav button and fixing SEO artifacts in the Dockerfile.
Description check	✅ Passed	The description provides a clear summary of the changes, explains the context from PR #1686, details test cases, and completes the pre-merge checklist with appropriate N/A markings.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/web-docs-url-mobile

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