fix(soundboard): let the clip-name field fill its available width

The folds Input container is display:flex with no width, so inside the row's
grow="Yes" wrapper the wrapper grew but the input collapsed to content width.
Set width:100% on the Input so the name field uses the space the row gives it.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/app/components/soundboard-pack-view/SoundboardPackEditor.tsx

@@ -317,6 +317,7 @@ export function SoundboardPackEditor({ pack, canEdit, onUpdate }: SoundboardPack
             readOnly={!canEdit || markedDeleted}
             onChange={(e: React.ChangeEvent<HTMLInputElement>) => commit({ body: e.target.value })}
             aria-label="Clip name"
+            style={{ width: '100%' }}
           />
         </Box>
         <Box