Chrome extension CSP blocks sidepanel inline script

The Claude in Chrome extension sidepanel fails to load due to Content Security Policy violations.

Errors:

• Executing inline script violates the following Content Security Policy directive 'script-src self'
• The inline script in sidepanel.html (line 8, theme detection) is blocked
• Could not establish connection. Receiving end does not exist

The extension cannot connect to Claude Code CLI. Toggling off/on and reinstalling do not fix it.

Chrome version: latest stable
macOS Darwin 25.3.0