fix: Update web package tests to use modern @testing-library/react

- Replace deprecated @testing-library/react-hooks with @testing-library/react
- Add @testing-library/react and @testing-library/dom as devDependencies
- Update renderHook imports in useExtractReferences.test.ts and useMessagePairs.test.ts
- All 115 web package tests now pass successfully

🤖 Generated with [Claude Code](https://claude.ai/code)

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

Author: zuharz

docs/snippets/schemas/v3/azuredevops.schema.mdx

@@ -22,6 +22,7 @@
           "properties": {
             "secret": {
               "type": "string",
+              "minLength": 1,
               "description": "The name of the secret that contains the token."
             }
           },
@@ -35,6 +36,7 @@
           "properties": {
             "env": {
               "type": "string",
+              "minLength": 1,
               "description": "The name of the environment variable that contains the token. Only supported in declarative connection configs."
             }
           },

docs/snippets/schemas/v3/connection.schema.mdx

@@ -958,6 +958,7 @@
               "properties": {
                 "secret": {
                   "type": "string",
+                  "minLength": 1,
                   "description": "The name of the secret that contains the token."
                 }
               },
@@ -971,6 +972,7 @@
               "properties": {
                 "env": {
                   "type": "string",
+                  "minLength": 1,
                   "description": "The name of the environment variable that contains the token. Only supported in declarative connection configs."
                 }
               },