fix: DM filter input full width — add direction="Column" to wrapper Box

Without direction="Column" the flex container defaults to row, so the
Input only takes its intrinsic width instead of stretching. Matches the
identical Box in Home.tsx which already had direction="Column".

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/app/pages/client/direct/Direct.tsx

@@ -264,6 +264,7 @@ export function Direct() {
             <NavCategory>
               <Box
                 grow="Yes"
+                direction="Column"
                 style={{ padding: `0 ${config.space.S200}`, paddingBottom: config.space.S100 }}
               >
                 <Input