Fix mini app errors listed in base preview tool #1518
Description
According to the base mini app preview tool, we're not signaling app readiness and are missing a few requirements. This is strange because it does work in the base app. Nonetheless, worth investigating and seeing if we can solve these issues in the preview/understanding why the preview is showing these errors.
https://www.base.dev/preview?url=https://nounspace.com&tab=metadata
Ensure iconUrl, splashImageUrl, heroImageUrl, and ogImageUrl are implemented correctly. Note that we have different preview images for different space types (ie. proposal, user, token, channel).
Ensure we're signaling app readiness correctly. SuggestionsL
- stop calling the Farcaster frame SDK ready action during provider bootstrap and fetch the initial context separately
- add a MiniAppReady client utility that signals ready on the next frame after the UI mounts when running inside a mini app
- render the new readiness utility alongside the global providers so mini app shells hide their splash screens promptly