added Feedback page, added braindump backend

hooks/firebase/useUpdateNote.ts

@@ -0,0 +1,65 @@
+import { useAuthContext } from "@/contexts/AuthContext";
+import { useMutation, useQueryClient } from "react-query";
+import firestore from "@react-native-firebase/firestore";
+import { IBrainDump } from "@/contexts/DumpContext";
+
+interface UpdateNoteParams {
+  id: number;
+  changes: Partial<IBrainDump>;
+}
+
+export const useUpdateNote = () => {
+  const { user: currentUser } = useAuthContext();
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationKey: ["updateNote"],
+    mutationFn: async ({ id, changes }: UpdateNoteParams) => {
+      try {
+        const snapshot = await firestore()
+          .collection("BrainDumps")
+          .where("id", "==", id)
+          .get();
+
+        if (snapshot.empty) {
+          throw new Error("Note not found");
+        }
+
+        const docId = snapshot.docs[0].id;
+        const noteData = snapshot.docs[0].data();
+
+        if (noteData.creatorId !== currentUser?.uid) {
+          throw new Error(
+            "Unauthorized: You can only update your own note"
+          );
+        }
+
+        await firestore()
+          .collection("BrainDumps")
+          .doc(docId)
+          .update({
+            ...changes,
+            updatedAt: firestore.FieldValue.serverTimestamp(),
+            lastModifiedBy: currentUser?.uid,
+          });
+
+        return {
+          id,
+          ...noteData,
+          ...changes,
+        };
+      } catch (e) {
+        console.error("Error updating note: ", e);
+        throw e;
+      }
+    },
+    onSuccess: (updatedNote) => {
+      queryClient.invalidateQueries("braindumps");
+
+      queryClient.setQueryData(
+        ["feedback", updatedNote.id],
+        updatedNote
+      );
+    },
+  });
+};