feat(nx-dev): use textarea for prompts and show a better "no results"error

[jaysoo]

This PR makes the AI chat prompt a textarea so code snippets can be pasted. Also improves the "no results" message to be less jarring.

Try it: https://nx-dev-git-fork-jaysoo-feat-ai-textarea-and-better-errors-nrwl.vercel.app/ai

ai-page.mp4

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 25, 2023 0:34am

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• linux nx affected --target=e2e --base=577f8201582cfed29743299cbe78978bda528d74 --head=3b6f83c172d0d04fe4bad8f1d3f26f398b993cd4 --parallel=1
• linux nx affected --target=build --base=577f8201582cfed29743299cbe78978bda528d74 --head=3b6f83c172d0d04fe4bad8f1d3f26f398b993cd4 --parallel=3
• linux nx affected --target=lint --base=577f8201582cfed29743299cbe78978bda528d74 --head=3b6f83c172d0d04fe4bad8f1d3f26f398b993cd4 --parallel=3
• linux nx affected --target=test --base=577f8201582cfed29743299cbe78978bda528d74 --head=3b6f83c172d0d04fe4bad8f1d3f26f398b993cd4 --parallel=1
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• macos nx affected -t e2e-macos --parallel=1 --base=577f8201582cfed29743299cbe78978bda528d74 --head=3b6f83c172d0d04fe4bad8f1d3f26f398b993cd4

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[FrozenPandaz]

Looks good, can we add some padding-right to save room for the submit button? Can we have the submit button on the bottom right?

[jaysoo]

@FrozenPandaz Done

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