ui: incoming call button hierarchy + EventReaders timestamp glow

- IncomingCall: Reject uses variant=Critical (red), Ignore uses variant=Secondary
  — previously both were variant=Success (green), making them visually identical
  to the Answer button
- EventReaders: TDS timestamp glow reduced from double-layer to single-layer
  (was 0 0 6px + 0 0 14px, now just 0 0 5px at 0.45 opacity)

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

src/app/components/CallEmbedProvider.tsx

@@ -235,7 +235,7 @@ function IncomingCall({ dm, info, onIgnore, onAnswer, onReject }: IncomingCallPr
                   </Button>
                   <Button
                     style={{ flexGrow: 1 }}
-                    variant="Success"
+                    variant={dm ? 'Critical' : 'Secondary'}
                     fill="Soft"
                     size="400"
                     radii="400"

src/app/components/event-readers/EventReaders.tsx

@@ -145,7 +145,7 @@ export const EventReaders = as<'div', EventReadersProps>(
                             lotusTerminal
                               ? {
                                   color: '#FFB300',
-                                  textShadow: '0 0 6px #FFB300, 0 0 14px rgba(255,179,0,0.40)',
+                                  textShadow: '0 0 5px rgba(255,179,0,0.45)',
                                   fontSize: '0.72rem',
                                 }
                               : { opacity: 0.6 }