fix: update StackBlitz start command to avoid shebang error

Use npm link instead of node dist/index.js to properly install the CLI
in the WebContainer environment. This avoids the shebang parsing error
and makes the 'safe' command available globally in the terminal.

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

Co-Authored-By: Claude <[email protected]>

Author: katspaugh

.stackblitzrc

@@ -1,6 +1,6 @@
 {
   "installDependencies": true,
-  "startCommand": "npm run build && npm start",
+  "startCommand": "npm run build && npm link && echo '\nSafe CLI is ready! Try running: safe --help\n'",
   "env": {
     "NODE_ENV": "development"
   },