fix(migration): overwrite workspace yaml overrides and handle force-mode vite-plus

Always overwrite pnpm-workspace.yaml overrides when migrating from
package.json, since the package.json value was the effective one
(pnpm ignores workspace overrides when pnpm.overrides exists).

Also write the vite-plus override to pnpm-workspace.yaml in force
mode for standalone projects without existing pnpm config.

Author: fengmk2

packages/cli/snap-tests-global/migration-monorepo-pnpm-overrides-dependency-selector/snap.txt

@@ -45,7 +45,7 @@ catalog:
 
 overrides:
   '@vitejs/plugin-react>vite': 'npm:vite@<semver>'
-  'supertest>superagent': '9.0.2'
+  'supertest>superagent': <semver>
   vite: 'catalog:'
   vitest: 'catalog:'
   react-click-away-listener>react: <semver>

packages/cli/src/migration/migrator.ts

@@ -730,6 +730,13 @@ export function rewriteStandaloneProject(
       usePnpmWorkspaceYaml = !pkg.pnpm;
       if (usePnpmWorkspaceYaml) {
         rewritePnpmWorkspaceYaml(projectPath);
+        // In force-override mode, also override vite-plus itself so transitive
+        // deps resolve to the local tgz instead of the published version.
+        if (isForceOverrideMode() && !VITE_PLUS_VERSION.startsWith('file:')) {
+          migratePnpmOverridesToWorkspaceYaml(projectPath, {
+            [VITE_PLUS_NAME]: VITE_PLUS_VERSION,
+          });
+        }
       }
       const overrideKeys = Object.keys(VITE_PLUS_OVERRIDE_PACKAGES);
       if (!usePnpmWorkspaceYaml) {
@@ -1056,9 +1063,9 @@ function migratePnpmOverridesToWorkspaceYaml(
   const pnpmWorkspaceYamlPath = path.join(projectPath, 'pnpm-workspace.yaml');
   editYamlFile(pnpmWorkspaceYamlPath, (doc) => {
     for (const [key, value] of Object.entries(overrides)) {
-      if (!doc.hasIn(['overrides', key])) {
-        doc.setIn(['overrides', scalarString(key)], scalarString(value));
-      }
+      // Always overwrite: package.json value was the effective one before migration
+      // (pnpm ignores workspace overrides when pnpm.overrides exists in package.json)
+      doc.setIn(['overrides', scalarString(key)], scalarString(value));
     }
   });
 }