Update npm dependencies and adapt to Starlight 0.42

[styler]

Updates ten npm dependencies and refreshes the pnpm lockfile. Adapts our mobile menu styles to Starlight 0.42's native popover markup and keeps Escape from closing the whole sidebar when dismissing the product selector.

Package	Before	After
astro	7.1.0	7.3.2
@astrojs/starlight	0.41.3	0.42.0
@astrojs/sitemap	3.7.3	3.7.4
@fontsource-variable/inter	5.2.8	5.3.0
mermaid	11.16.0	11.17.2
sharp	0.35.3	0.35.4
starlight-links-validator	0.25.2	0.26.0
starlight-sidebar-topics	0.8.0	0.9.0
playwright	1.61.1	1.63.0
wrangler	4.112.0	4.131.1

Mermaid stays on the latest 11.x release because astro-mermaid 2.1.0 only declares support for Mermaid 10 and 11. It is the only remaining entry in pnpm outdated.

Validation:

• pnpm install --frozen-lockfile passes.
• pnpm build passes: 203 pages and valid internal links.
• git diff --check passes.
• Chrome: mobile menu styling, nested Escape dismissal, and Mermaid diagram rendering verified.
• Generated llms-full.txt includes Chatbot and SE.Live content.

Known upstream peer warning: starlight-llms-txt 0.11.0 depends on @astrojs/mdx 7.0.3, whose optional @astrojs/markdown-satteri peer expects ^0.3.1; Starlight now supplies 0.4.1. The site and LLM docs build successfully. No dependency overrides or warning suppression added.

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Status	Name	Latest Commit	Updated (UTC)
✅ Deployment successful! View logs	docs	f20a1ac	Sep 13 2026, 12:25 PM

[linear-code]

CORE-1472