Fix overflow issue on iOS autocomplete, among other things

[mozzius]

Fixes a few issues with the autocomplete

• Fixes overflow issue on iOS (ripped out a dumb system based on number of characters and just figured out how to do the same behaviour with flexbox)
• Fixes missing display name issue on web (search for @zed.dev to see this)
• Remove use of reading refs in render in favour of the built-in flag on the hook
• Use unicode symbol for ellipsis instead of ... (since this looks weird next to numberOfLines)

Before	After

Test plan

• Check that the overflow issue is indeed fixed (iOS) and check that I didn't break anything (Android)
• Check that it still maintains stale items as you type (this is what the ref did)
• Check that accounts where the displayname is >50% width and handles are short still take up as much space as they can (iOS + Android) - @atproto.com is a good example

[github-actions]

Old size	New size	Diff
8.06 MB	8.06 MB	-1 B (-0.00%)

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[gaearon]

works well in my testing