feat(desktop): restore message quick reactions (#6892)

## Summary

- restore three learned quick-reaction shortcuts to the desktop message
action rail
- keep Add reaction (`SmilePlus`, `h-4 w-4`) immediately after shortcuts
and left of the restored divider
- preserve Reply, Copy link, More, custom emoji rendering, accessibility
labels, and responsive behavior
- hide shortcuts and the divider below `sm`, while keeping Add reaction
available

## Tests

At `24c4732c2341b846dccf4ae8fdc2455f700fc44d`:

- `pnpm exec biome check src/features/messages/ui/MessageActionBar.tsx
tests/e2e/message-copy-link.spec.ts tests/e2e/custom-emoji.spec.ts`
- `pnpm exec tsc --noEmit`
- `pnpm test` — 5,567 passed
- `pnpm build:e2e`
- `pnpm exec playwright test tests/e2e/message-copy-link.spec.ts
tests/e2e/custom-emoji.spec.ts --project=smoke` — 19 passed
- `pnpm exec playwright test tests/e2e/reaction-order.spec.ts
--project=smoke` — 2 passed
- pre-push: file-size-check, desktop-check, desktop-typecheck,
desktop-test

Vogue design review: **SHIP**.

## Screenshot

Restored desktop message action rail: three learned quick reactions, Add
reaction (`SmilePlus`), divider, Reply, Copy link, and More.

![Restored desktop message action
rail](https://d24qwcpro867f5.cloudfront.net/repos/buzz/prs/6892/restored-message-action-rail.png)

Signed-off-by: Rivet <a08d9a8418c7ff03afe19964724c8fd87bf1776ab9e9b9cafb8cc920edd02a6e@buzz.block.builderlab.xyz>
Co-authored-by: Rivet <a08d9a8418c7ff03afe19964724c8fd87bf1776ab9e9b9cafb8cc920edd02a6e@buzz.block.builderlab.xyz>

desktop/src/features/messages/ui/MessageActionBar.tsx

@@ -18,6 +18,7 @@ import { toast } from "sonner";
 
 import { buildMessageLink } from "@/features/messages/lib/messageLink";
 import { EmojiPicker } from "@/features/custom-emoji/ui/EmojiPicker";
+import { useCustomEmoji } from "@/features/custom-emoji/hooks";
 import { getThreadReference } from "@/features/messages/lib/threading";
 import { ReportMessageDialog } from "@/features/moderation/ui/ReportMessageDialog";
 import { MessageModerationMenuItems } from "@/features/moderation/ui/MessageModerationMenuItems";
@@ -25,9 +26,15 @@ import type {
   TimelineMessage,
   TimelineReaction,
 } from "@/features/messages/types";
-import { recordQuickReactionEmoji } from "@/features/messages/ui/useQuickReactionEmojis";
+import {
+  recordQuickReactionEmoji,
+  useQuickReactionEmojis,
+} from "@/features/messages/ui/useQuickReactionEmojis";
+import { reactionEmojiUrl } from "@/shared/api/customEmoji";
 import { cn } from "@/shared/lib/cn";
 import { copyTextToClipboard } from "@/shared/lib/clipboard";
+import { emojiDisplayName } from "@/shared/lib/emojiName";
+import { rewriteRelayUrl } from "@/shared/lib/mediaUrl";
 import { KIND_HUDDLE_STARTED } from "@/shared/constants/kinds";
 import { Button } from "@/shared/ui/button";
 import { HashArrowIn } from "@/shared/ui/icons";
@@ -329,6 +336,51 @@ function MoreActionsMenu({
   );
 }
 
+function QuickReactionButton({
+  customEmojiUrl,
+  emoji,
+  onSelect,
+}: {
+  customEmojiUrl?: string;
+  emoji: string;
+  onSelect: (emoji: string) => void;
+}) {
+  const displayName = emojiDisplayName(emoji);
+  const mediaUrl = customEmojiUrl ? rewriteRelayUrl(customEmojiUrl) : null;
+
+  return (
+    <Tooltip>
+      <TooltipTrigger asChild>
+        <button
+          aria-label={`React with ${displayName}`}
+          className="flex h-8 w-8 items-center justify-center rounded-full text-base leading-none text-muted-foreground transition-colors hover:bg-muted hover:text-foreground focus-visible:outline-hidden focus-visible:ring-1 focus-visible:ring-ring"
+          onClick={() => onSelect(emoji)}
+          title={displayName}
+          type="button"
+        >
+          {mediaUrl ? (
+            <img
+              alt={emoji}
+              className="h-5 w-5 object-contain"
+              draggable={false}
+              src={mediaUrl}
+            />
+          ) : (
+            <span aria-hidden="true" className="translate-y-px">
+              {emoji}
+            </span>
+          )}
+        </button>
+      </TooltipTrigger>
+      <TooltipContent>{displayName}</TooltipContent>
+    </Tooltip>
+  );
+}
+
+function isCustomEmojiShortcode(emoji: string) {
+  return emoji.startsWith(":") && emoji.endsWith(":");
+}
+
 export const MessageActionBar = React.memo(function MessageActionBar({
   channelId,
   message,
@@ -372,6 +424,20 @@ export const MessageActionBar = React.memo(function MessageActionBar({
 }) {
   const [isReactionPickerOpen, setIsReactionPickerOpen] = React.useState(false);
   const [isDropdownOpen, setIsDropdownOpen] = React.useState(false);
+  const customEmoji = useCustomEmoji();
+  const quickReactionEmojis = useQuickReactionEmojis(3, customEmoji);
+  const quickReactionItems = React.useMemo(
+    () =>
+      quickReactionEmojis
+        .map((emoji) => ({
+          customEmojiUrl: reactionEmojiUrl(emoji, customEmoji),
+          emoji,
+        }))
+        .filter(
+          (item) => !isCustomEmojiShortcode(item.emoji) || item.customEmojiUrl,
+        ),
+    [customEmoji, quickReactionEmojis],
+  );
   const hasReplyAction = Boolean(onReply);
   const hasReactionAction = Boolean(onReactionSelect);
 
@@ -436,6 +502,19 @@ export const MessageActionBar = React.memo(function MessageActionBar({
     >
       <div className="overflow-hidden rounded-full border border-border/70 bg-background/95 shadow-xs backdrop-blur-sm supports-[backdrop-filter]:bg-background/85">
         <div className="flex items-center gap-0.5 p-1">
+          {hasReactionAction && quickReactionItems.length > 0 ? (
+            <div className="hidden items-center gap-0.5 sm:flex">
+              {quickReactionItems.map(({ customEmojiUrl, emoji }) => (
+                <QuickReactionButton
+                  customEmojiUrl={customEmojiUrl}
+                  emoji={emoji}
+                  key={emoji}
+                  onSelect={handleReactionSelection}
+                />
+              ))}
+            </div>
+          ) : null}
+
           {hasReactionAction ? (
             <Popover
               onOpenChange={setIsReactionPickerOpen}
@@ -483,6 +562,14 @@ export const MessageActionBar = React.memo(function MessageActionBar({
             </Popover>
           ) : null}
 
+          {hasReactionAction && quickReactionItems.length > 0 ? (
+            <div
+              aria-hidden="true"
+              className="mx-0.5 hidden h-4 w-px bg-border/70 sm:block"
+              data-testid="message-action-divider"
+            />
+          ) : null}
+
           {hasReplyAction ? (
             <Tooltip>
               <TooltipTrigger asChild>

desktop/tests/e2e/custom-emoji.spec.ts

@@ -285,6 +285,30 @@ async function quickReactionStorageContains(
   }, emoji);
 }
 
+test("message quick reaction stays neutral after selecting a shortcut", async ({
+  page,
+}) => {
+  await openGeneral(page);
+
+  const row = reactionTargetRow(page);
+  await expect(row).toBeVisible();
+  await row.hover();
+
+  const quickReactionButton = row.getByRole("button", {
+    name: "React with :+1:",
+  });
+  await expect(quickReactionButton).toBeVisible();
+  await quickReactionButton.click();
+
+  await expect(row.getByLabel("Toggle 👍 reaction")).toBeVisible();
+  await row.hover();
+  await expect(quickReactionButton).not.toHaveAttribute("aria-pressed", "true");
+  await expect(quickReactionButton).not.toHaveClass(SELECTED_ACTION_CLASS);
+  await expect(messageReactionTrigger(row)).not.toHaveClass(
+    SELECTED_ACTION_CLASS,
+  );
+});
+
 test("message reaction action stays neutral after selecting from the picker", async ({
   page,
 }) => {

desktop/tests/e2e/message-copy-link.spec.ts

@@ -79,22 +79,42 @@ test("message action rail copies the same canonical thread link as More", async
   await replyRow.hover();
 
   const actionBar = replyRow.getByTestId(`message-action-bar-${replyId}`);
-  const quickReactions = actionBar.getByRole("button", {
-    name: /^React with /,
-  });
-  await expect(quickReactions).toHaveCount(0);
   const orderedActionNames = await actionBar
     .getByRole("button")
     .evaluateAll((buttons) =>
       buttons.map((button) => button.getAttribute("aria-label")),
     );
   expect(orderedActionNames).toEqual([
+    "React with :+1:",
+    "React with :heart:",
+    "React with :joy:",
     "Open reactions",
     "Reply",
     "Copy link",
     "More actions",
   ]);
 
+  const pickerButton = actionBar.getByRole("button", {
+    name: "Open reactions",
+  });
+  await expect(pickerButton.locator("svg")).toHaveClass(/lucide-smile-plus/);
+
+  const divider = actionBar.getByTestId("message-action-divider");
+  await expect(divider).toBeVisible();
+  const [pickerBox, dividerBox, replyBox] = await Promise.all([
+    actionBar.getByRole("button", { name: "Open reactions" }).boundingBox(),
+    divider.boundingBox(),
+    actionBar.getByRole("button", { name: "Reply" }).boundingBox(),
+  ]);
+  expect(pickerBox).not.toBeNull();
+  expect(dividerBox).not.toBeNull();
+  expect(replyBox).not.toBeNull();
+  if (!pickerBox || !dividerBox || !replyBox) {
+    throw new Error("Message action order bounds missing.");
+  }
+  expect(pickerBox.x + pickerBox.width).toBeLessThan(dividerBox.x);
+  expect(dividerBox.x + dividerBox.width).toBeLessThan(replyBox.x);
+
   const copyLink = actionBar.getByTestId(`copy-link-message-${replyId}`);
   await expect(copyLink).toHaveAccessibleName("Copy link");
   await copyLink.hover();