fix: terminal output duplication on mobile

Remove duplicate onPtyData call in pty.ts that caused every daemon-backed
PTY data event to be dispatched twice through dataListeners, doubling all
terminal output sent to mobile clients.

Also: clean up registerSubscriptionCleanup to evict stale listeners on
reconnect, add regression tests, fix CI lint/type errors, add mobile UX
improvements (worktree creation, settings, about screen).

Co-authored-by: Orca <help@stably.ai>

Author: Jinwoo-H

mobile/app/_layout.tsx

@@ -23,7 +23,9 @@ export default function RootLayout() {
             headerTitle: () => <OrcaLogo size={22} />
           }}
         />
-        <Stack.Screen name="pair-scan" options={{ title: 'Pair Host' }} />
+        <Stack.Screen name="pair-scan" options={{ headerShown: false }} />
+        <Stack.Screen name="settings" options={{ headerShown: false }} />
+        <Stack.Screen name="about" options={{ headerShown: false }} />
         <Stack.Screen name="h" options={{ headerShown: false }} />
       </Stack>
     </>

mobile/app/about.tsx

@@ -0,0 +1,146 @@
+import { View, Text, StyleSheet, Pressable, Linking } from 'react-native'
+import { useSafeAreaInsets } from 'react-native-safe-area-context'
+import { useRouter } from 'expo-router'
+import { ChevronLeft, Globe } from 'lucide-react-native'
+import Svg, { Path } from 'react-native-svg'
+import { OrcaLogo } from '../src/components/OrcaLogo'
+import { colors, spacing, typography } from '../src/theme/mobile-theme'
+
+function GithubIcon({ size = 16, color = colors.textSecondary }) {
+  return (
+    <Svg width={size} height={size} viewBox="0 0 24 24" fill={color}>
+      <Path d="M12 0C5.37 0 0 5.37 0 12c0 5.31 3.435 9.795 8.205 11.385.6.105.825-.255.825-.57 0-.285-.015-1.23-.015-2.235-3.015.555-3.795-.735-4.035-1.41-.135-.345-.72-1.41-1.23-1.695-.42-.225-1.02-.78-.015-.795.945-.015 1.62.87 1.845 1.23 1.08 1.815 2.805 1.305 3.495.99.105-.78.42-1.305.765-1.605-2.67-.3-5.46-1.335-5.46-5.925 0-1.305.465-2.385 1.23-3.225-.12-.3-.54-1.53.12-3.18 0 0 1.005-.315 3.3 1.23.96-.27 1.98-.405 3-.405s2.04.135 3 .405c2.295-1.56 3.3-1.23 3.3-1.23.66 1.65.24 2.88.12 3.18.765.84 1.23 1.905 1.23 3.225 0 4.605-2.805 5.625-5.475 5.925.435.375.81 1.095.81 2.22 0 1.605-.015 2.895-.015 3.3 0 .315.225.69.825.57A12.02 12.02 0 0 0 24 12c0-6.63-5.37-12-12-12z" />
+    </Svg>
+  )
+}
+
+function XIcon({ size = 16, color = colors.textSecondary }) {
+  return (
+    <Svg width={size} height={size} viewBox="0 0 24 24" fill={color}>
+      <Path d="M18.244 2.25h3.308l-7.227 8.26 8.502 11.24H16.17l-5.214-6.817L4.99 21.75H1.68l7.73-8.835L1.254 2.25H8.08l4.713 6.231zm-1.161 17.52h1.833L7.084 4.126H5.117z" />
+    </Svg>
+  )
+}
+
+export default function AboutScreen() {
+  const router = useRouter()
+  const insets = useSafeAreaInsets()
+
+  return (
+    <View style={[styles.container, { paddingTop: insets.top + spacing.sm }]}>
+      <View style={styles.topRow}>
+        <Pressable style={styles.backButton} onPress={() => router.back()}>
+          <ChevronLeft size={22} color={colors.textSecondary} />
+        </Pressable>
+        <Text style={styles.heading}>About</Text>
+      </View>
+
+      <View style={styles.brand}>
+        <OrcaLogo size={28} />
+        <Text style={styles.brandName}>Orca</Text>
+        <Text style={styles.brandSub}>Open-source agent IDE for 100x builders</Text>
+      </View>
+
+      <View style={styles.section}>
+        <Pressable
+          style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+          onPress={() => void Linking.openURL('https://onOrca.dev')}
+        >
+          <Globe size={16} color={colors.textSecondary} />
+          <Text style={styles.rowLabel}>Website</Text>
+          <Text style={styles.rowValue}>onOrca.dev</Text>
+        </Pressable>
+        <View style={styles.separator} />
+        <Pressable
+          style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+          onPress={() => void Linking.openURL('https://github.com/stablyai/orca')}
+        >
+          <GithubIcon />
+          <Text style={styles.rowLabel}>GitHub</Text>
+          <Text style={styles.rowValue}>stablyai/orca</Text>
+        </Pressable>
+        <View style={styles.separator} />
+        <Pressable
+          style={({ pressed }) => [styles.row, pressed && styles.rowPressed]}
+          onPress={() => void Linking.openURL('https://x.com/orca_build')}
+        >
+          <XIcon />
+          <Text style={styles.rowLabel}>X</Text>
+          <Text style={styles.rowValue}>@orca_build</Text>
+        </Pressable>
+      </View>
+    </View>
+  )
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: colors.bgBase,
+    padding: spacing.lg
+  },
+  topRow: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    marginBottom: spacing.xl
+  },
+  backButton: {
+    width: 36,
+    height: 36,
+    borderRadius: 18,
+    alignItems: 'center',
+    justifyContent: 'center',
+    marginRight: spacing.sm
+  },
+  heading: {
+    fontSize: 20,
+    fontWeight: '700',
+    color: colors.textPrimary
+  },
+  brand: {
+    alignItems: 'center',
+    paddingVertical: spacing.xl,
+    marginBottom: spacing.lg
+  },
+  brandName: {
+    fontSize: 22,
+    fontWeight: '800',
+    color: colors.textPrimary,
+    marginTop: spacing.sm
+  },
+  brandSub: {
+    fontSize: 13,
+    color: colors.textMuted,
+    marginTop: spacing.xs
+  },
+  section: {
+    backgroundColor: colors.bgPanel,
+    borderRadius: 12,
+    overflow: 'hidden'
+  },
+  row: {
+    flexDirection: 'row',
+    alignItems: 'center',
+    gap: spacing.sm + 2,
+    paddingVertical: spacing.md,
+    paddingHorizontal: spacing.md + 2
+  },
+  rowPressed: {
+    backgroundColor: colors.bgRaised
+  },
+  rowLabel: {
+    flex: 1,
+    fontSize: typography.bodySize,
+    fontWeight: '500',
+    color: colors.textPrimary
+  },
+  rowValue: {
+    fontSize: typography.bodySize,
+    color: colors.accentBlue
+  },
+  separator: {
+    height: StyleSheet.hairlineWidth,
+    backgroundColor: colors.borderSubtle,
+    marginHorizontal: spacing.md
+  }
+})