feat: add support for Astro 6

[trueberryless]

Needs to wait for withastro/astro#15753
Needs to wait for withastro/astro#15888 as well

Summary by CodeRabbit

• Chores
  • Updated all project dependencies and development tooling to latest compatible versions.
  • Node.js engine requirement updated: all users must now use version 22.12.0 or higher.
  • Upgraded core documentation framework, build system tooling, validation packages, and related components to enhance stability, improve security standards, and enable access to latest ecosystem features.

[changeset-bot]

🦋 Changeset detected

Latest commit: 09c6b99

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[netlify]

❌ Deploy Preview for starlight-latest-version failed.

Name	Link
🔨 Latest commit	09c6b99
🔍 Latest deploy log	https://app.netlify.com/projects/starlight-latest-version/deploys/69b7f33b8c95260008bc9f14

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 731e8ce8-f267-46b1-a85f-a1b435fc8591

📥 Commits

Reviewing files that changed from the base of the PR and between 2b6af49 and 09c6b99.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (4)

• .changeset/silent-monkeys-admire.md
• package.json
• packages/starlight-latest-version/libs/config.ts
• packages/starlight-latest-version/package.json

Walkthrough

The docs/package.json file was updated with upgraded dependency versions: astro (5.16.5 to 6.0.4), netlify (6.6.3 to 7.0.2), starlight (0.37.1 to 0.38.1), and starlight-links-validator (0.19.2 to 0.20.0). The Node.js engine constraint was changed from supporting versions ^18.17.1, ^20.3.0, or >=21.0.0 to requiring >=22.12.0.

Changes

Cohort / File(s)	Summary
Dependency & Engine Updates docs/package.json	Upgraded astro, netlify, starlight, and starlight-links-validator to newer major/minor versions. Restricted Node.js engine requirement from flexible ranges to >=22.12.0.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Poem

🐰 Hops of joy through version trees,
Astro hops to six with ease,
Starlight twinkles, netlify flows,
Node grows stronger as we go,
Dependencies dance, shiny and new! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Title check	✅ Passed	The PR title 'feat: add support for Astro 6' clearly and accurately summarizes the main change: upgrading Astro from v5 to v6 with supporting dependency updates.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/upgrade-astro

📝 Coding Plan

• Generate coding plan for human review comments

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@docs/package.json`:
- Around line 29-36: The starlight-latest-version workspace plugin declares a
Starlight peer but lacks an explicit Astro peer while the docs app uses Astro 6;
update the plugin package manifest (packages/starlight-latest-version
package.json) to add a peerDependencies entry for "astro" (e.g., "astro": "^6"
or an appropriate range), run the plugin against Astro 6 to verify
compatibility, and if any dev or test tooling is pinned to Astro 5
(devDependencies or local test env pinned to 5.16.5), update those pins to a
matching 6.x version or run compatibility fixes; alternatively, if you cannot
confirm compatibility, revert the docs app Astro version to the supported Astro
5 range instead.

---

ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8881f6f7-f694-4fcc-b8c8-a2cdc896a240

📥 Commits

Reviewing files that changed from the base of the PR and between bf10134 and 2b6af49.

⛔ Files ignored due to path filters (1)

• pnpm-lock.yaml is excluded by !**/pnpm-lock.yaml

📒 Files selected for processing (1)

• docs/package.json