Pin dependency versions and fix nested .yarn gitignore

Remove ^ prefixes from all dependencies for reproducible installs.
Dependabot will handle version bumps via PRs.

Also add defaultSemverRangePrefix: "" to .yarnrc.yml so future
yarn add commands pin exact versions, and fix .gitignore to cover
nested .yarn/ directories.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ksroda-sa

.gitignore

@@ -4,7 +4,7 @@ dist/
 !.env.example
 *.local
 .angular/
-.yarn/*
-!.yarn/releases
+**/.yarn/*
+!**/.yarn/releases
 docs/
 

samples/react/login-pkce/.yarnrc.yml

@@ -1,3 +1,5 @@
+defaultSemverRangePrefix: ""
+
 nodeLinker: node-modules
 
 npmRegistryServer: "https://registry.npmjs.org"

samples/react/login-pkce/package.json

@@ -12,22 +12,22 @@
     "format:check": "prettier --check ."
   },
   "dependencies": {
-    "oidc-client-ts": "^3.2.0",
-    "react": "^19.1.0",
-    "react-dom": "^19.1.0",
-    "react-oidc-context": "^3.2.0"
+    "oidc-client-ts": "3.5.0",
+    "react": "19.2.5",
+    "react-dom": "19.2.5",
+    "react-oidc-context": "3.3.1"
   },
   "devDependencies": {
-    "@testing-library/dom": "^10.4.1",
-    "@testing-library/jest-dom": "^6.9.1",
-    "@testing-library/react": "^16.3.2",
-    "@types/react": "^19.1.0",
-    "@types/react-dom": "^19.1.0",
-    "@vitejs/plugin-react": "^4.5.0",
-    "happy-dom": "^20.8.9",
-    "prettier": "^3.8.1",
-    "typescript": "^5.8.0",
-    "vite": "^6.3.0",
-    "vitest": "^4.1.3"
+    "@testing-library/dom": "10.4.1",
+    "@testing-library/jest-dom": "6.9.1",
+    "@testing-library/react": "16.3.2",
+    "@types/react": "19.2.14",
+    "@types/react-dom": "19.2.3",
+    "@vitejs/plugin-react": "6.0.1",
+    "happy-dom": "20.8.9",
+    "prettier": "3.8.2",
+    "typescript": "6.0.2",
+    "vite": "8.0.8",
+    "vitest": "4.1.4"
   }
 }