Realign docs sidebar with section tabs and explicit page order

- Add root:true to language/ and ai-tools/ meta.json so Fumadocs
  registers them as isolated sidebar sections (Helius-style tabs)
- Rename ai-tools section title from "AI Tools" to "Agents" throughout
  (meta.json title, top navbar link in layout.shared.tsx)
- Reorder content/docs/meta.json pages explicitly instead of relying
  on wildcard expansion
- Wire DocsLayout tabs in $.tsx: Documentation → Language Reference →
  Agents → Community & Support, using getLayoutTabs() with manual
  ordering to guarantee correct tab sequence regardless of meta.json order

Author: Aliserag

content/docs/ai-tools/meta.json

@@ -1,5 +1,6 @@
 {
-  "title": "AI Tools",
+  "title": "Agents",
+  "root": true,
   "pages": [
     "skills",
     "mcp-server",

content/docs/language/meta.json

@@ -1,5 +1,6 @@
 {
   "title": "Language Reference",
+  "root": true,
   "pages": [
     "syntax",
     "constants-and-variables",

content/docs/meta.json

@@ -1,16 +1,19 @@
 {
   "pages": [
-    "...",
+    "index",
     "why",
+    "ai-tools",
     "solidity-to-cadence",
-    "json-cadence-spec",
+    "tutorial",
+    "language",
     "design-patterns",
     "anti-patterns",
     "project-development-tips",
+    "security-best-practices",
+    "json-cadence-spec",
+    "contract-upgrades",
     "measuring-time",
     "testing-framework",
-    "contract-upgrades",
-    "security-best-practices",
-    "ai-tools"
+    "cadence-migration-guide"
   ]
 }

src/lib/layout.shared.tsx

@@ -24,7 +24,7 @@ export function baseOptions(): BaseLayoutProps {
         external: true,
       },
       { text: 'Language Reference', url: '/docs/language' },
-      { text: 'AI Tools', url: '/docs/ai-tools' },
+      { text: 'Agents', url: '/docs/ai-tools' },
       {
         type: 'icon',
         text: 'GitHub',