fix: invert control of chat controls upstream

[abvthecity]

this PR improves the ergonomics of defining the chat component and binding it with the useChat hook, and in the process improve some UX glitches:

1. align the radix versions across all packages to fix bugs related to popover/dialog focus scopes. (TODO: This needs to continuously be monitored, because it keeps breaking— causing autofocus problems)
2. when typing, always scroll to the selected cmdk-item. this fixes a bug with the cmdk-item today where it doesn't scroll because it doesn't know that its children has been updated.
3. wrapping the useChat inside of the component feels convoluted; in this PR i'm moving the useChat hook upstream (inverted) so that this can be refined/hot-swapped as needed— which better aligns with the goal of multiplexing across different llm providers and backend (i.e. trieve and vellum).

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Name	Status	Preview	Updated (UTC)
rbac.ferndocs.com	❌ Failed (Inspect)		Dec 17, 2024 0:52am

1 Skipped Deployment

Name	Status	Preview	Updated (UTC)
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📦 Next.js Bundle Analysis for fern-platform-monorepo

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Playwright test results

 95 passed
 4 flaky
 4 skipped

Details

 103 tests across 10 suites
 1 minute, 42 seconds
 d467f60

Flaky tests

chromium › forward-proxy/nextjs.spec.ts › capture the flag
chromium › smoke/favicon.spec.ts › Check if favicon exists and URL does not return 404 for docs.boundaryml.com
chromium › smoke/favicon.spec.ts › Check if favicon exists and URL does not return 404 for docs.cable.tech
chromium › smoke/favicon.spec.ts › Check if favicon exists and URL does not return 404 for docs.givechariot.com

Skipped tests

chromium › posthog.spec.ts › Posthog loads successfully
chromium › proxy.spec.ts › multipart-form upload
chromium › proxy.spec.ts › json request
chromium › websockets/websocket.spec.ts › websocket test