Product Roundup #37: guest preview links, faster Xentral syncing and leaner published pages

A round of smaller improvements that make the Experience Designer, Studio and integrations faster and more dependable.

Designer & Studio

Chat history stays with the conversation. The Designer now keeps your chat history tied to its conversation, so context doesn't get lost as you work.
Share previews via a guest link. Send a Designer preview to anyone through a guest link - no account required to take a look.
Safer Studio starts. Frontic now refuses to start a Studio when the GitHub connection can't support it, so you avoid confusing failures.
Cleaner Studio job list. The Studio jobs list is skipped for users without Studio access.

Clearer storage-field errors. The "field in use" message now includes field context and friendlier wording, so it's obvious what to fix.

Leaner published output. Each experience now ships a single inline bundle instead of one runtime copy per island, trimming page weight.
Preview URLs stick for Shopware. A preview URL set on a Shopware-bound experience now stays put.
More accurate save detection. Experience saves now reflect real changes, with an added guard and typed kinds under the hood.

Fewer requests for product updates. Product syncing now uses the Xentral V3 products API, dramatically cutting the number of requests.
OpenAPI spec renders again. The fetch API's OpenAPI spec is back to rendering correctly.
Recovers from unreachable repositories. Frontic now resets a remembered repository when it can no longer be reached.