Two independent bugs caused the slash-command autocomplete to render
`/goal` as `/goa` (and `/gquota` as `/gquot` for that matter) in the TUI:
1. `tui_gateway/server.py` was forwarding `c.display` from
prompt_toolkit's `Completion` straight into the JSON-RPC payload.
prompt_toolkit normalizes `display=` into `FormattedText` (a `list`
subclass), so the wire format became `[["", "/goal"]]` instead of
the `string` that `CompletionItem.display` in the TUI declares.
`meta` already went through `to_plain_text` — `display` did not.
2. The dropdown row in `appOverlays.tsx` used `flexDirection="row"`
with the display `<Text>` and the (very long) meta `<Text>` as
siblings. When the meta overflows the row width, Ink/Yoga shrinks
the *first* column by one cell, lopping the trailing character off
the command name. `/goal` triggers it reliably because its meta
string is the longest of any built-in command (description +
embedded `[text | pause | resume | clear | status]` usage hint).
Wrapping the display column in `<Box flexShrink={0}>` keeps it at
its natural width and lets the meta wrap or truncate instead.
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