fix(ci): add typescript as explicit devDependency

pnpm strict hoisting means only direct deps are on PATH. The overrides
entry pins the version but does not install tsc as a binary. Without an
explicit devDependency entry pnpm run tsc fails with "tsc: not found".

package.json

@@ -73,6 +73,7 @@
     "react-dom": "^18.3.1",
     "react-router-dom": "^5.3.0",
     "typedoc": "^0.28.16",
+    "typescript": "~5.6.2",
     "typedoc-plugin-markdown": "^4.10.0",
     "vitest": "^3.2.4"
   }

pnpm-lock.yaml

@@ -69,6 +69,9 @@ importers:
       typedoc-plugin-markdown:
         specifier: ^4.10.0
         version: 4.11.0(typedoc@0.28.18(typescript@5.6.2))
+      typescript:
+        specifier: ~5.6.2
+        version: 5.6.2
       vitest:
         specifier: ^3.2.4
         version: 3.2.4(@types/debug@4.1.13)(@types/node@20.19.37)(jsdom@24.1.3)(msw@2.4.9(typescript@5.6.2))(terser@5.46.1)(yaml@2.8.3)