fix(command-menu): replace hardcoded neutral-* utilities with theme tokens

[creazyfrog]

Summary

• Fixes [bug]: command menu hardcodes neutral-* colors instead of theme tokens #10819: The docs command menu (apps/v4/components/command-menu.tsx) hardcoded neutral-* Tailwind utilities for the dialog chrome and footer bar instead of using CSS theme tokens
• On the shadcn default theme this looks identical, but the hardcoded colors drift when the component is used under any non-neutral base theme (where --popover, --muted, and --border are retinted)

Changes

• apps/v4/components/command-menu.tsx line 403 (DialogContent): replaced ring-neutral-200/80 dark:bg-neutral-900 dark:ring-neutral-800 with bg-popover ring-foreground/5 dark:ring-foreground/10
• apps/v4/components/command-menu.tsx line 442 (footer bar): replaced border-t-neutral-100 bg-neutral-50 dark:border-t-neutral-700 dark:bg-neutral-800 with border-border bg-muted/50

Testing

Docs-only component change. The visual output under the default (neutral) theme is unchanged — the token values resolve to the same colors. The fix becomes visible under non-neutral themes where --popover/--muted/--border differ from the neutral palette.

Closes #10819

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