feat: init

apps/space/core/components/ui/icon.tsx

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+import React from "react";
+
+type Props = {
+  iconName: string;
+  className?: string;
+};
+
+export const Icon: React.FC<Props> = ({ iconName, className = "" }) => (
+  <span className={`material-symbols-rounded text-sm font-light leading-5 ${className}`}>{iconName}</span>
+);

apps/space/core/components/ui/index.ts

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+export * from "./icon";
+export * from "./reaction-selector";

apps/space/core/components/ui/not-found.tsx

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+"use client";
+
+import React from "react";
+import Image from "next/image";
+// images
+import Image404 from "@/public/404.svg";
+
+export const PageNotFound = () => (
+  <div className={`h-screen w-full overflow-hidden bg-custom-background-100`}>
+    <div className="grid h-full place-items-center p-4">
+      <div className="space-y-8 text-center">
+        <div className="relative mx-auto h-60 w-60 lg:h-80 lg:w-80">
+          <Image src={Image404} layout="fill" alt="404- Page not found" />
+        </div>
+        <div className="space-y-2">
+          <h3 className="text-lg font-semibold">Oops! Something went wrong.</h3>
+          <p className="text-sm text-custom-text-200">
+            Sorry, the page you are looking for cannot be found. It may have been removed, had its name changed, or is
+            temporarily unavailable.
+          </p>
+        </div>
+      </div>
+    </div>
+  </div>
+);

apps/space/core/components/ui/reaction-selector.tsx

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+import { Fragment } from "react";
+
+// headless ui
+import { Popover, Transition } from "@headlessui/react";
+
+// helper
+import { Icon } from "@/components/ui";
+import { renderEmoji } from "@/helpers/emoji.helper";
+
+// icons
+
+const reactionEmojis = ["128077", "128078", "128516", "128165", "128533", "129505", "9992", "128064"];
+
+interface Props {
+  onSelect: (emoji: string) => void;
+  position?: "top" | "bottom";
+  selected?: string[];
+  size?: "sm" | "md" | "lg";
+}
+
+export const ReactionSelector: React.FC<Props> = (props) => {
+  const { onSelect, position, selected = [], size } = props;
+
+  return (
+    <Popover className="relative">
+      {({ open, close: closePopover }) => (
+        <>
+          <Popover.Button
+            className={`${
+              open ? "" : "text-opacity-90"
+            } group inline-flex items-center rounded-md bg-custom-background-80 focus:outline-none`}
+          >
+            <span
+              className={`flex items-center justify-center rounded-md px-2 ${
+                size === "sm" ? "h-6 w-6" : size === "md" ? "h-7 w-7" : "h-8 w-8"
+              }`}
+            >
+              <Icon iconName="add_reaction" className="scale-125 text-custom-text-100" />
+            </span>
+          </Popover.Button>
+          <Transition
+            as={Fragment}
+            enter="transition ease-out duration-200"
+            enterFrom="opacity-0 translate-y-1"
+            enterTo="opacity-100 translate-y-0"
+            leave="transition ease-in duration-150"
+            leaveFrom="opacity-100 translate-y-0"
+            leaveTo="opacity-0 translate-y-1"
+          >
+            <Popover.Panel
+              className={`absolute -left-2 z-10 bg-custom-sidebar-background-100 ${
+                position === "top" ? "-top-12" : "-bottom-12"
+              }`}
+            >
+              <div className="rounded-md border border-custom-border-200 bg-custom-sidebar-background-100 p-1 shadow-custom-shadow-sm">
+                <div className="flex gap-x-1">
+                  {reactionEmojis.map((emoji) => (
+                    <button
+                      key={emoji}
+                      type="button"
+                      onClick={() => {
+                        onSelect(emoji);
+                        closePopover();
+                      }}
+                      className={`grid select-none place-items-center rounded-md p-1 text-sm ${
+                        selected.includes(emoji) ? "bg-custom-primary-100/10" : "hover:bg-custom-sidebar-background-80"
+                      }`}
+                    >
+                      {renderEmoji(emoji)}
+                    </button>
+                  ))}
+                </div>
+              </div>
+            </Popover.Panel>
+          </Transition>
+        </>
+      )}
+    </Popover>
+  );
+};