Upgrade astro to v6

package.json

@@ -19,15 +19,15 @@
     "test": "node --test --import ./test/register-loader.js test/**/*.test.ts"
   },
   "dependencies": {
-    "@astrojs/check": "^0.9.4",
-    "@astrojs/partytown": "^2.1.4",
-    "@astrojs/starlight": "^0.36.0",
-    "@astrojs/vercel": "^8.2.8",
+    "@astrojs/check": "^0.9.9",
+    "@astrojs/partytown": "^2.1.7",
+    "@astrojs/starlight": "^0.38.4",
+    "@astrojs/vercel": "^10.0.6",
     "@expressive-code/plugin-collapsible-sections": "^0.41.3",
     "@expressive-code/plugin-line-numbers": "^0.41.3",
     "@nomicfoundation/hardhat-errors": "^3.0.10",
     "@types/tar-stream": "^3.1.4",
-    "astro": "^5.6.1",
+    "astro": "^6.2.2",
     "cspell": "^9.2.2",
     "github-slugger": "^2.0.0",
     "gsap": "^3.13.0",
@@ -37,8 +37,8 @@
     "prettier-plugin-solidity": "2.1.0",
     "sass": "^1.93.2",
     "sharp": "^0.34.2",
-    "starlight-links-validator": "^0.18.0",
-    "starlight-sidebar-topics": "^0.6.1",
+    "starlight-links-validator": "^0.24.0",
+    "starlight-sidebar-topics": "^0.7.1",
     "tar-stream": "^3.1.7",
     "typescript": "5.9.3",
     "undici": "^7.16.0"

src/components/starlight-overrides/Sidebar.astro

@@ -9,7 +9,7 @@ import TopicsDropdown from "./TopicsDropdown.astro";
 <Default><slot /></Default>
 
 {/* Make the the nested group labels have the same size as links */}
-{/* Based on SidebarSublist.astro of @astrojs/starlight@0.36.0 */}
+{/* Based on SidebarSublist.astro of @astrojs/starlight@0.38.4 */}
 <style is:global>
   .sidebar-content details details .group-label > .large {
     font-size: var(--sl-text-sm);

src/content.config.ts

@@ -1,4 +1,5 @@
-import { defineCollection, z } from "astro:content";
+import { defineCollection } from "astro:content";
+import { z } from "astro/zod";
 import { docsLoader } from "@astrojs/starlight/loaders";
 import { docsSchema } from "@astrojs/starlight/schema";
 import { githubReleases } from "./content/githubReleases";

src/content/blogposts.ts

@@ -1,5 +1,5 @@
 import { defineCollection } from "astro:content";
-import { z } from "astro:schema";
+import { z } from "astro/zod";
 
 const blogpostsCollectionSchema = z.object({
   id: z.string(),

src/content/community-plugins.ts

@@ -1,5 +1,5 @@
 import { defineCollection } from "astro:content";
-import { z } from "astro:schema";
+import { z } from "astro/zod";
 
 import { styleText } from "node:util";
 import path from "node:path";

src/content/githubReleases.ts

@@ -1,5 +1,5 @@
 import { defineCollection } from "astro:content";
-import { z } from "astro:schema";
+import { z } from "astro/zod";
 
 const githubRelaseApiSchema = z.object({
   id: z.number(),

src/content/officialPlugins.ts

@@ -1,6 +1,6 @@
 import type { Loader } from "astro/loaders";
 import { defineCollection } from "astro:content";
-import { z } from "astro:schema";
+import { z } from "astro/zod";
 
 import fs from "node:fs/promises";
 import path from "node:path";

src/pages/llms.txt.ts

@@ -1,14 +1,13 @@
 import { getCollection } from "astro:content";
 import type { StarlightSidebarTopicsUserConfig } from "starlight-sidebar-topics";
+import type { StarlightUserConfig } from "@astrojs/starlight/types";
 import { sidebarTopics } from "../sidebar";
 
 type SidebarTopic = StarlightSidebarTopicsUserConfig[number];
 
 // Sidebar items are a recursive union — Starlight types them via z.any(),
 // so we narrow with property checks at runtime.
-type SidebarItem = NonNullable<
-  Extract<SidebarTopic, { items: unknown }>["items"]
->[number];
+type SidebarItem = NonNullable<StarlightUserConfig["sidebar"]>[number];
 
 interface DocEntry {
   id: string;