feat: UX improvements, security hardening, and code cleanup

- Extract shared extractError utility (lib/extractError.ts), remove 3 duplicate copies
- Export DEFAULT_BASE_URL from PostizContext, remove duplicate in settings
- Add 401 interceptor in axios client: fires UnauthorizedHandler in _layout → alert + redirect to Settings
- Calendar day items now tappable: tap opens context menu (Copy / Edit / Repost)
- Persist sort order (newest/oldest) across sessions via AsyncStorage
- Filter chips show post count per status (Queue 3, Error 1, etc.)
- Copy text action now shows a brief "Copied" toast + haptic feedback
- PostCard: swipe right → Reschedule action (QUEUE posts only, amber color)
- Compose: per-network char limit (Twitter 280, Instagram 2200…) with color warning at 90%
- Compose: local draft save/restore via AsyncStorage with restore banner on open
- Compose: prefillImagePath/prefillImageId params allow Edit/Repost to carry over existing media

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

artifacts/postiz-mobile/components/PostCard.tsx

@@ -18,6 +18,7 @@ interface PostCardProps {
   post: PostizPost;
   onDelete: (id: string) => Promise<void>;
   onLongPress: (post: PostizPost) => void;
+  onReschedule?: (post: PostizPost) => void;
 }
 
 function formatDate(dateStr: string): string {
@@ -44,7 +45,7 @@ function getNetworkIcon(type?: string): React.ComponentProps<typeof Feather>["na
   return "globe";
 }
 
-export function PostCard({ post, onDelete, onLongPress }: PostCardProps) {
+export function PostCard({ post, onDelete, onLongPress, onReschedule }: PostCardProps) {
   const colors = useColors();
   const swipeRef = useRef<Swipeable>(null);
 
@@ -88,6 +89,34 @@ export function PostCard({ post, onDelete, onLongPress }: PostCardProps) {
     );
   };
 
+  const renderLeftActions =
+    post.state === "QUEUE" && onReschedule
+      ? (
+          _progress: Animated.AnimatedInterpolation<number>,
+          dragX: Animated.AnimatedInterpolation<number>
+        ) => {
+          const scale = dragX.interpolate({
+            inputRange: [0, 80],
+            outputRange: [0.8, 1],
+            extrapolate: "clamp",
+          });
+          return (
+            <TouchableOpacity
+              style={[styles.rescheduleAction, { backgroundColor: colors.warning }]}
+              onPress={() => {
+                swipeRef.current?.close();
+                onReschedule(post);
+              }}
+              activeOpacity={0.8}
+            >
+              <Animated.View style={{ transform: [{ scale }] }}>
+                <Feather name="clock" size={20} color="#fff" />
+              </Animated.View>
+            </TouchableOpacity>
+          );
+        }
+      : undefined;
+
   const integrations = post.integrations ?? (post.integration ? [post.integration] : []);
   const truncatedContent =
     post.content.length > 140
@@ -98,7 +127,9 @@ export function PostCard({ post, onDelete, onLongPress }: PostCardProps) {
     <Swipeable
       ref={swipeRef}
       renderRightActions={renderRightActions}
+      renderLeftActions={renderLeftActions}
       rightThreshold={40}
+      leftThreshold={40}
       friction={2}
     >
       <TouchableOpacity
@@ -218,4 +249,9 @@ const styles = StyleSheet.create({
     alignItems: "center",
     justifyContent: "center",
   },
+  rescheduleAction: {
+    width: 72,
+    alignItems: "center",
+    justifyContent: "center",
+  },
 });