ci(test-fixtures): override typecheck target for styling fixture apps

The Nx @nx/js/typescript plugin auto-infers `tsc --build --emitDeclarationOnly`
as the typecheck target for any project with a tsconfig.json. The Tailwind
and styled-components fixture apps have `noEmit: true` (they are Vite apps,
not libraries), so the inferred command fails with TS5069.

Override the inferred target with `tsc --noEmit` via the package.json `nx`
field. Type errors are still surfaced; the apps just no longer try to emit
declaration files they don't need.

Pre-existing failure on the base branch (feat/sprint-2734) — surfaced by CI
on this PR's merge gate. Reviewer-pushed fix to unblock the merge.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Narrator

packages/domscribe-test-fixtures/styling/styled-app/package.json

@@ -7,6 +7,17 @@
     "build": "vite build",
     "preview": "vite preview --port 4802 --strictPort"
   },
+  "nx": {
+    "targets": {
+      "typecheck": {
+        "executor": "nx:run-commands",
+        "options": {
+          "command": "tsc --noEmit",
+          "cwd": "packages/domscribe-test-fixtures/styling/styled-app"
+        }
+      }
+    }
+  },
   "dependencies": {
     "react": "^18.3.1",
     "react-dom": "^18.3.1",

packages/domscribe-test-fixtures/styling/tailwind-app/package.json

@@ -7,6 +7,17 @@
     "build": "vite build",
     "preview": "vite preview --port 4801 --strictPort"
   },
+  "nx": {
+    "targets": {
+      "typecheck": {
+        "executor": "nx:run-commands",
+        "options": {
+          "command": "tsc --noEmit",
+          "cwd": "packages/domscribe-test-fixtures/styling/tailwind-app"
+        }
+      }
+    }
+  },
   "dependencies": {
     "react": "^18.3.1",
     "react-dom": "^18.3.1"