bug(cli): white dot appears at top of logo in --help output

[mynameistito]

The logo in opencode --help is broken — the first row's whitespace gets stripped by yargs' .usage(), collapsing the ▄ ('d' bump) to the far left and rendering it in the wrong color.

The upgrade command is unaffected since it calls UI.logo() directly without going through yargs.

Related: #10912

[mynameistito]

fixed