fix: Resolve TypeScript errors in Button and ultravoxService

- Button.tsx: Replace `condition && style` with ternary operators
  to ensure array elements are always ViewStyle/TextStyle (not false)
- ultravoxService.ts: Add 'in' type guard before accessing optional
  'location' property on alert objects

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

components/ui/Button.tsx

@@ -34,8 +34,8 @@ export function Button({
     styles.base,
     styles[variant],
     styles[`size_${size}`],
-    fullWidth && styles.fullWidth,
-    isDisabled && styles.disabled,
+    fullWidth ? styles.fullWidth : {},
+    isDisabled ? styles.disabled : {},
     style as ViewStyle,
   ];
 
@@ -43,7 +43,7 @@ export function Button({
     styles.text,
     styles[`text_${variant}`],
     styles[`text_${size}`],
-    isDisabled && styles.textDisabled,
+    isDisabled ? styles.textDisabled : {},
   ];
 
   return (

services/ultravoxService.ts

@@ -88,7 +88,7 @@ CURRENT STATUS (Today - ${todayData?.day || 'Wednesday'}):
       const emoji = alert.severity === 'critical' ? '🔴' : alert.severity === 'high' ? '🟠' : alert.severity === 'medium' ? '🟡' : '🟢';
       context += `  ${emoji} ${alert.type.replace(/_/g, ' ').toUpperCase()} at ${alert.time}`;
       if (alert.note) context += ` - ${alert.note}`;
-      if (alert.location) context += ` (${alert.location})`;
+      if ('location' in alert && alert.location) context += ` (${alert.location})`;
       context += '\n';
     });
   }