chore(ci): use Node 20 and fix version-check paths

- Bump CI NODE_VERSION to 20 to satisfy cross-env/cypress engine
- Make check-version.js use absolute paths so it works from any cwd
- Version consistency job now passes in CI

Author: decode2

.github/workflows/ci.yml

@@ -7,7 +7,7 @@ on:
     branches: [ main, develop ]
 
 env:
-  NODE_VERSION: '18'
+  NODE_VERSION: '20'
   DOTNET_VERSION: '9.0.x'
 
 jobs:

scripts/check-version.js

@@ -10,9 +10,9 @@ const path = require('path');
 
 // Configuration
 const CONFIG = {
-  versionFile: 'VERSION',
-  packageJson: 'client-ts/package.json',
-  csprojFile: 'TaskManagerApp.csproj'
+  versionFile: path.join(__dirname, '..', 'VERSION'),
+  packageJson: path.join(__dirname, '..', 'client-ts', 'package.json'),
+  csprojFile: path.join(__dirname, '..', 'TaskManagerApp.csproj')
 };
 
 // ANSI Colors