Bot Goals page redesign and more resilient widget and previews.

Improved: The Goals page has a two-column layout, a performance strip showing how often the goal is offered and clicked, a test chat, and guards against saving a goal that cannot work.
Improved: Goal availability follows the plan of the organization that owns the bot.
Fixed: The widget renders inside iframes and private windows where browser storage is blocked; before, it could fail to appear.
Fixed: Dashboard tabs left open across an update recover automatically instead of showing a broken page.
Fixed: The bot test page and preview no longer break under a browser translator, and the preview's Replay button works again.
Fixed: Install detection on the Deploy page now recognizes inline page embeds, not only the floating widget.
Security: Tightened access checks across the dashboard backend so every request is verified against your sign-in and bot permissions.