feat: add floating button for new forum post

src/navigation/ForumStackNavigator.tsx

@@ -11,7 +11,7 @@ const CreateEcosystemStackNavigator = () => {
       <ForumStack.Screen
         name="AddForumPost"
         component={AddForumPostScreen}
-        options={{ title: "" }}
+        options={({ route }) => ({ title: route.params.headerTitle })}
       />
       <ForumStack.Screen
         name="ForumPostDetail"

src/screens/ecosystem/EcosystemDetailScreen.tsx

 import * as React from "react";
-import { StyleSheet, Image, Alert, ActivityIndicator } from "react-native";
+import {
+  StyleSheet,
+  Image,
+  Alert,
+  ActivityIndicator,
+  TouchableOpacity,
+} from "react-native";
 import { Text, View } from "../../components/Themed";
 import Colors from "../../constants/Colors";
 import SmallButton from "../../components/button/SmallButton";
@@ -189,6 +195,20 @@ const EcosystemDetailScreen = ({
           color="#000000"
         />
       </View>
+      <TouchableOpacity
+        style={styles.floatingTouchable}
+        onPress={() => {
+          nav.navigate("Forum", {
+            screen: "AddForumPost",
+            params: { headerTitle: title, id: id },
+          });
+        }}
+      >
+        <Image
+          source={require("../../../assets/images/plusButton.png")}
+          style={styles.floatingButton}
+        />
+      </TouchableOpacity>
     </View>
   );
 };
@@ -239,6 +259,20 @@ const styles = StyleSheet.create({
     marginTop: 4,
     width: Layout.window.width * 0.9,
   },
+  floatingTouchable: {
+    width: 60,
+    height: 60,
+    position: "absolute",
+    alignItems: "center",
+    justifyContent: "center",
+    right: 21,
+    bottom: 21,
+  },
+  floatingButton: {
+    resizeMode: "contain",
+    width: 72,
+    height: 72,
+  },
 });
 
 export default EcosystemDetailScreen;