chore: fix --version weird error

tsdown.config.ts

@@ -7,6 +7,16 @@ dotenvLoad();
 // Get all TM_PUBLIC_* env variables for build-time injection
 const getBuildTimeEnvs = () => {
 	const envs: Record<string, string> = {};
+
+	// Inject package.json version at build time
+	try {
+		const packageJson = JSON.parse(require('fs').readFileSync('package.json', 'utf8'));
+		envs['TM_PUBLIC_VERSION'] = packageJson.version || 'unknown';
+	} catch (error) {
+		console.warn('Could not read package.json version during build:', error);
+		envs['TM_PUBLIC_VERSION'] = 'unknown';
+	}
+
 	for (const [key, value] of Object.entries(process.env)) {
 		if (key.startsWith('TM_PUBLIC_')) {
 			// Return the actual value, not JSON.stringify'd