fix(ui): use folds Text priority instead of raw opacity (native-cinny nit)

Replaced raw style={{ opacity: N }} de-emphasis on folds <Text> with the
`priority` prop across search, schedule, profile, and tray UI. Left the cases
that aren't Text-priority candidates (an Icon opacity, a Box-row opacity, and a
Text with an explicit color token).

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

src/app/features/room/ScheduledMessagesTray.tsx

@@ -140,17 +140,17 @@ export function ScheduledMessagesTray({ roomId }: ScheduledMessagesTrayProps) {
             >
               <Text
                 size="T200"
+                priority="400"
                 style={{
                   flex: 1,
                   overflow: 'hidden',
                   textOverflow: 'ellipsis',
                   whiteSpace: 'nowrap',
-                  opacity: 0.8,
                 }}
               >
                 {typeof msg.content.body === 'string' ? (msg.content.body as string) : '(message)'}
               </Text>
-              <Text size="T200" style={{ opacity: 0.6, whiteSpace: 'nowrap', flexShrink: 0 }}>
+              <Text size="T200" priority="300" style={{ whiteSpace: 'nowrap', flexShrink: 0 }}>
                 {formatSendAt(msg.sendAt)}
               </Text>
               <IconButton