Clean version management with generated version.js

- Replace package.json modification with generated src/version.js
- App imports VERSION from ./version instead of package.json
- version.js is auto-generated during prebuild and git-ignored
- Provides VERSION, IS_RELEASE, and BUILD_TIME constants
- No more dirty git status from version changes

Development builds show 1.0.4-dev, tagged releases show 1.0.4

scripts/version-check.js

@@ -0,0 +1,46 @@
+#!/usr/bin/env node
+
+const fs = require('fs');
+const path = require('path');
+const { execSync } = require('child_process');
+
+// Read package.json for base version
+const packagePath = './package.json';
+const pkg = JSON.parse(fs.readFileSync(packagePath, 'utf8'));
+
+let version = pkg.version;
+let isRelease = false;
+
+try {
+  // Check if current commit is tagged
+  const gitTag = execSync('git tag --points-at HEAD', { encoding: 'utf8' }).trim();
+
+  if (gitTag) {
+    // We're at a tagged commit - use clean version
+    console.log(`✅ Building release version ${version} (tagged: ${gitTag})`);
+    isRelease = true;
+  } else {
+    // We're not at a tagged commit - add -dev suffix
+    version = `${version}-dev`;
+    console.log(`📦 Building development version ${version}`);
+    isRelease = false;
+  }
+} catch (error) {
+  // Git command failed (maybe not in a git repo)
+  version = `${version}-dev`;
+  console.log(`⚠️  Cannot determine git status, using development version ${version}`);
+  isRelease = false;
+}
+
+// Generate version.js file
+const versionFile = path.join('./src', 'version.js');
+const versionContent = `// Auto-generated version file - do not edit manually
+// Generated at: ${new Date().toISOString()}
+
+export const VERSION = '${version}';
+export const IS_RELEASE = ${isRelease};
+export const BUILD_TIME = '${new Date().toISOString()}';
+`;
+
+fs.writeFileSync(versionFile, versionContent);
+console.log(`📝 Generated ${versionFile} with version ${version}`);