Move container divs for components into those components.

The styles for the `MessageInput` and `CreateConversationForm` components assume that the container div will be present, and the components will not render as intended without them. Therefore: they are "part of" the component in most of the ways that matter, not part of the context in which the component is used. Moving the divs into the component will make it easier to reuse these components (for example, in swatches).

The diff for this looks worse than it is because of indentation changes.

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