arreglado path /timeline y añadida logica crearpost al fetch

src/lib/stores/posts.ts

@@ -0,0 +1,22 @@
+import { writable } from 'svelte/store';
+import type { Post } from '../../types';
+
+export const posts = writable<Post[]>([]);
+
+export const setPosts = (newPosts: Post[]) => {
+	posts.set(newPosts);
+};
+
+export const addPost = (post: Post) => {
+	posts.update((currentPosts) => [post, ...currentPosts]);
+};
+
+export const updatePost = (postId: string, updatedData: Partial<Post>) => {
+	posts.update((currentPosts) =>
+		currentPosts.map((post) => (post._id === postId ? { ...post, ...updatedData } : post))
+	);
+};
+
+export const removePost = (postId: string) => {
+	posts.update((currentPosts) => currentPosts.filter((post) => post._id !== postId));
+};