chore(deps): declare shikiji-core as direct dependency

useMarkdown.hook.ts imports types from shikiji-core, but it was only
present transitively via markdown-it-shikiji. pnpm's strict resolution
blocks importing undeclared transitives, breaking type-check.

Pinned to 0.10.2 to match the version markdown-it-shikiji@0.10.2 pulls
in. The shikiji line is deprecated upstream in favor of shiki; a real
migration is out of scope here.

package.json

@@ -61,6 +61,7 @@
     "register-service-worker": "^1.7.2",
     "retrobus": "^1.9.4",
     "sanitize-html": "^2.17.0",
+    "shikiji-core": "0.10.2",
     "vue": "^3.5.18",
     "vue-i18n": "^11.1.11",
     "vue-router": "^4.5.1",

pnpm-lock.yaml

@@ -140,6 +140,9 @@ importers:
       sanitize-html:
         specifier: ^2.17.0
         version: 2.17.0
+      shikiji-core:
+        specifier: 0.10.2
+        version: 0.10.2
       vue:
         specifier: ^3.5.18
         version: 3.5.18(typescript@5.9.3)
@@ -5710,7 +5713,7 @@ packages:
 
   shikiji-core@0.10.2:
     resolution: {integrity: sha512-9Of8HMlF96usXJHmCL3Gd0Fcf0EcyJUF9m8EoAKKd98mHXi0La2AZl1h6PegSFGtiYcBDK/fLuKbDa1l16r1fA==}
-    deprecated: Shikiji is merged back to Shiki v1.0, please migrate over to get the latest updates
+    deprecated: Deprecated, use @shikijs/core instead
 
   shikiji-transformers@0.10.2:
     resolution: {integrity: sha512-7IVTwl1af205ywYEq5bOAYOTOFW4V1dVX1EablP0nWKErqZeD1o93VMytxmtJomqS+YwbB8doY8SE3MFMn0aPQ==}