feat: add long-press contextual actions on post cards

Long press any post card to open a context menu with state-aware actions:
- Copy text (all states)
- ERROR: Retry now, Edit & retry, View error message
- QUEUE: Edit, Reschedule (native DateTimePicker → PUT /posts/:id)
- PUBLISHED: Repost
- DRAFT: Edit & schedule

Compose screen now accepts prefillContent/prefillIntegrationIds router
params to pre-fill content and channel selection when editing or reposting.
Adds expo-clipboard for clipboard support.

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

artifacts/postiz-mobile/app/(tabs)/posts.tsx

@@ -1,6 +1,10 @@
 import { Feather } from "@expo/vector-icons";
+import DateTimePicker from "@react-native-community/datetimepicker";
 import { useQuery, useQueryClient } from "@tanstack/react-query";
 import axios from "axios";
+import * as Clipboard from "expo-clipboard";
+import * as Haptics from "expo-haptics";
+import { useRouter } from "expo-router";
 import React, { useMemo, useState } from "react";
 import {
   ActivityIndicator,
@@ -51,9 +55,15 @@ export default function PostsScreen() {
   const insets = useSafeAreaInsets();
   const { client, isConfigured } = usePostiz();
   const queryClient = useQueryClient();
+  const router = useRouter();
   const [filter, setFilter] = useState<FilterType>("all");
   const [refreshing, setRefreshing] = useState(false);
 
+  // reschedule state
+  const [reschedulePost, setReschedulePost] = useState<PostizPost | null>(null);
+  const [rescheduleDate, setRescheduleDate] = useState(new Date());
+  const [rescheduleStep, setRescheduleStep] = useState<"date" | "time" | null>(null);
+
   const { startDate, endDate } = useMemo(() => {
     const s = new Date();
     s.setMonth(s.getMonth() - 3);
@@ -99,6 +109,101 @@ export default function PostsScreen() {
     }
   };
 
+  const handleRetry = async (post: PostizPost) => {
+    if (!client) return;
+    const integrations = post.integrations ?? (post.integration ? [post.integration] : []);
+    try {
+      const payload = {
+        type: "now",
+        date: new Date().toISOString(),
+        shortLink: false,
+        tags: [] as string[],
+        posts: integrations.map((intg) => ({
+          integration: { id: intg.id },
+          value: [{ content: post.content, id: "", image: post.image ?? [] }],
+        })),
+      };
+      await client.post("posts", payload);
+      Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
+      queryClient.invalidateQueries({ queryKey: ["posts-list"] });
+      Alert.alert("Retried", "Post submitted again.");
+    } catch (e: unknown) {
+      const msg = extractError(e);
+      Alert.alert("Retry failed", msg);
+    }
+  };
+
+  const handlePrefillCompose = (post: PostizPost) => {
+    const integrations = post.integrations ?? (post.integration ? [post.integration] : []);
+    router.push({
+      pathname: "/(tabs)/compose",
+      params: {
+        prefillContent: post.content,
+        prefillIntegrationIds: integrations.map((i) => i.id).join(","),
+      },
+    });
+  };
+
+  const startReschedule = (post: PostizPost) => {
+    setReschedulePost(post);
+    setRescheduleDate(new Date(post.publishDate));
+    setRescheduleStep("date");
+  };
+
+  const submitReschedule = async (post: PostizPost, date: Date) => {
+    if (!client) return;
+    try {
+      await client.put(`posts/${post.id}`, { date: date.toISOString() });
+      queryClient.invalidateQueries({ queryKey: ["posts-list"] });
+      Haptics.notificationAsync(Haptics.NotificationFeedbackType.Success);
+      Alert.alert("Rescheduled", `Post moved to ${date.toLocaleDateString("en-US", { month: "short", day: "numeric", hour: "2-digit", minute: "2-digit" })}`);
+    } catch (e: unknown) {
+      const msg = extractError(e);
+      Alert.alert("Reschedule failed", msg);
+    }
+  };
+
+  const showContextMenu = (post: PostizPost) => {
+    Haptics.impactAsync(Haptics.ImpactFeedbackStyle.Medium);
+
+    const preview = post.content.slice(0, 60) + (post.content.length > 60 ? "…" : "");
+
+    const buttons: Array<{ text: string; style?: "cancel" | "destructive" | "default"; onPress?: () => void }> = [];
+
+    buttons.push({
+      text: "Copy text",
+      onPress: () => Clipboard.setStringAsync(post.content),
+    });
+
+    if (post.state === "ERROR") {
+      if (post.errorMessage) {
+        buttons.push({
+          text: "View error",
+          onPress: () => Alert.alert("Error details", post.errorMessage),
+        });
+      }
+      buttons.push({ text: "Retry now", onPress: () => handleRetry(post) });
+      buttons.push({ text: "Edit & retry", onPress: () => handlePrefillCompose(post) });
+    } else if (post.state === "QUEUE") {
+      buttons.push({ text: "Edit", onPress: () => handlePrefillCompose(post) });
+      buttons.push({ text: "Reschedule", onPress: () => startReschedule(post) });
+    } else if (post.state === "PUBLISHED") {
+      buttons.push({ text: "Repost", onPress: () => handlePrefillCompose(post) });
+    } else if (post.state === "DRAFT") {
+      buttons.push({ text: "Edit & schedule", onPress: () => handlePrefillCompose(post) });
+    }
+
+    buttons.push({ text: "Cancel", style: "cancel" });
+
+    Alert.alert(
+      post.state === "ERROR" ? "Failed post" :
+      post.state === "QUEUE" ? "Scheduled post" :
+      post.state === "PUBLISHED" ? "Published post" : "Draft",
+      preview,
+      buttons
+    );
+  };
+
   if (!isConfigured) {
     return (
       <View
@@ -193,7 +298,11 @@ export default function PostsScreen() {
           data={filteredPosts}
           keyExtractor={(item) => item.id}
           renderItem={({ item }) => (
-            <PostCard post={item} onDelete={handleDelete} />
+            <PostCard
+              post={item}
+              onDelete={handleDelete}
+              onLongPress={showContextMenu}
+            />
           )}
           refreshControl={
             <RefreshControl
@@ -220,6 +329,37 @@ export default function PostsScreen() {
           scrollEnabled={filteredPosts.length > 0}
         />
       )}
+
+      {rescheduleStep !== null && reschedulePost !== null && (
+        <DateTimePicker
+          value={rescheduleDate}
+          mode={rescheduleStep}
+          display="default"
+          minimumDate={rescheduleStep === "date" ? new Date() : undefined}
+          textColor={colors.foreground}
+          accentColor={colors.primary}
+          onChange={(_: unknown, date?: Date) => {
+            if (!date) {
+              setRescheduleStep(null);
+              setReschedulePost(null);
+              return;
+            }
+            if (rescheduleStep === "date") {
+              const merged = new Date(rescheduleDate);
+              merged.setFullYear(date.getFullYear(), date.getMonth(), date.getDate());
+              setRescheduleDate(merged);
+              setRescheduleStep("time");
+            } else {
+              const merged = new Date(rescheduleDate);
+              merged.setHours(date.getHours(), date.getMinutes());
+              const post = reschedulePost;
+              setRescheduleStep(null);
+              setReschedulePost(null);
+              submitReschedule(post, merged);
+            }
+          }}
+        />
+      )}
     </View>
   );
 }