migrate(react/next): Convo Page

[McPizza0]

This is part of the migration from Nuxt to Next
Please check the project here: https://github.com/orgs/un/projects/3?pane=info

What this issue covers

migrating apps/web-app/pages/[orgShortcode]/convo/[convoId].vue
each part of the page should be broken out into separate components, please check other issues first

Resources

All Next items should be created in the /apps/web/ folder
the source of the nuxt versions is in /apps/web-app/
For now this is a 1:1 migration from Nuxt - small code improvements/bug fixes can be included, but please open separate issues for larger re-factors.

The "Platform" backend should not be modified since we'll be running Nuxt and Next in parallel for a while

We'll be using the Radix theme for standard components: https://www.radix-ui.com/
with Radix Colors throughout the app: https://www.radix-ui.com/colors
The radix primitives are also installed, so we can use ShadCN components where they're more suitable: https://ui.shadcn.com/

Instructions

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