feat(web): sprint1 ui core with global toasts and improved chat layout

web/src/app/App.tsx

@@ -1,4 +1,5 @@
 import { useEffect } from "react";
+import { ToastViewport } from "../components/ToastViewport";
 import { AuthPage } from "../pages/AuthPage";
 import { ChatsPage } from "../pages/ChatsPage";
 import { useAuthStore } from "../store/authStore";
@@ -27,5 +28,10 @@ export function App() {
   if (!accessToken || !me) {
     return <AuthPage />;
   }
-  return <ChatsPage />;
+  return (
+    <>
+      <ChatsPage />
+      <ToastViewport />
+    </>
+  );
 }

web/src/components/ChatInfoPanel.tsx

@@ -17,6 +17,7 @@ import { blockUser, getUserById, listBlockedUsers, searchUsers, unblockUser } fr
 import type { AuthUser, ChatAttachment, ChatDetail, ChatMember, UserSearchItem } from "../chat/types";
 import { useAuthStore } from "../store/authStore";
 import { useChatStore } from "../store/chatStore";
+import { useUiStore } from "../store/uiStore";
 
 interface Props {
   chatId: number | null;
@@ -28,6 +29,7 @@ export function ChatInfoPanel({ chatId, open, onClose }: Props) {
   const me = useAuthStore((s) => s.me);
   const loadChats = useChatStore((s) => s.loadChats);
   const setActiveChatId = useChatStore((s) => s.setActiveChatId);
+  const showToast = useUiStore((s) => s.showToast);
   const [chat, setChat] = useState<ChatDetail | null>(null);
   const [members, setMembers] = useState<ChatMember[]>([]);
   const [memberUsers, setMemberUsers] = useState<Record<number, AuthUser>>({});
@@ -223,6 +225,7 @@ export function ChatInfoPanel({ chatId, open, onClose }: Props) {
                         setInviteLink(link.invite_url);
                         if (navigator.clipboard?.writeText) {
                           await navigator.clipboard.writeText(link.invite_url);
+                          showToast("Invite link copied");
                         }
                       } catch {
                         setError("Failed to create invite link");
@@ -489,7 +492,9 @@ export function ChatInfoPanel({ chatId, open, onClose }: Props) {
             onClick={async () => {
               try {
                 await navigator.clipboard.writeText(attachmentCtx.url);
+                showToast("Link copied");
               } catch {
+                showToast("Copy failed");
                 return;
               } finally {
                 setAttachmentCtx(null);

web/src/components/MessageList.tsx

@@ -10,6 +10,7 @@ import {
 import type { Message, MessageReaction } from "../chat/types";
 import { useAuthStore } from "../store/authStore";
 import { useChatStore } from "../store/chatStore";
+import { useUiStore } from "../store/uiStore";
 import { formatTime } from "../utils/format";
 import { formatMessageHtml } from "../utils/formatMessage";
 
@@ -45,6 +46,7 @@ export function MessageList() {
   const updateChatPinnedMessage = useChatStore((s) => s.updateChatPinnedMessage);
   const removeMessage = useChatStore((s) => s.removeMessage);
   const restoreMessages = useChatStore((s) => s.restoreMessages);
+  const showToast = useUiStore((s) => s.showToast);
 
   const [ctx, setCtx] = useState<ContextMenuState>(null);
   const [forwardMessageId, setForwardMessageId] = useState<number | null>(null);
@@ -58,7 +60,6 @@ export function MessageList() {
   const [pendingDelete, setPendingDelete] = useState<PendingDeleteState>(null);
   const [undoTick, setUndoTick] = useState(0);
   const [reactionsByMessage, setReactionsByMessage] = useState<Record<number, MessageReaction[]>>({});
-  const [toast, setToast] = useState<string | null>(null);
 
   const messages = useMemo(() => {
     if (!activeChatId) {
@@ -113,14 +114,6 @@ export function MessageList() {
     setReactionsByMessage({});
   }, [activeChatId]);
 
-  useEffect(() => {
-    if (!toast) {
-      return;
-    }
-    const timer = window.setTimeout(() => setToast(null), 2200);
-    return () => window.clearTimeout(timer);
-  }, [toast]);
-
   useEffect(() => {
     if (!pendingDelete) {
       return;
@@ -339,6 +332,12 @@ export function MessageList() {
 
         {messages.map((message, messageIndex) => {
           const own = message.sender_id === me?.id;
+          const prev = messageIndex > 0 ? messages[messageIndex - 1] : null;
+          const groupedWithPrev = Boolean(
+            prev &&
+            prev.sender_id === message.sender_id &&
+            Math.abs(new Date(message.created_at).getTime() - new Date(prev.created_at).getTime()) < 4 * 60 * 1000
+          );
           const replySource = message.reply_to_message_id ? messagesMap.get(message.reply_to_message_id) : null;
           const isSelected = selectedIds.has(message.id);
           const messageReactions = reactionsByMessage[message.id] ?? [];
@@ -355,13 +354,13 @@ export function MessageList() {
                 </div>
               ) : null}
 
-              <div className={`mb-2 flex ${own ? "justify-end" : "justify-start"}`}>
+              <div className={`${groupedWithPrev ? "mb-1" : "mb-2"} flex ${own ? "justify-end" : "justify-start"}`}>
                 <div
                   id={`message-${message.id}`}
-                  className={`max-w-[90%] rounded-2xl px-3 py-2.5 shadow-sm md:max-w-[70%] ${
+                  className={`max-w-[90%] px-3 py-2.5 shadow-sm md:max-w-[70%] ${
                     own
-                      ? "rounded-br-md bg-gradient-to-b from-sky-500/95 to-sky-600/90 text-slate-950"
+                      ? `${groupedWithPrev ? "rounded-2xl rounded-tr-md" : "rounded-2xl rounded-br-md"} bg-gradient-to-b from-sky-500/95 to-sky-600/90 text-slate-950`
-                      : "rounded-bl-md border border-slate-700/60 bg-slate-900/80 text-slate-100"
+                      : `${groupedWithPrev ? "rounded-2xl rounded-tl-md" : "rounded-2xl rounded-bl-md"} border border-slate-700/60 bg-slate-900/80 text-slate-100`
                   } ${isSelected ? "ring-2 ring-sky-400/80" : ""} ${focusedMessageId === message.id ? "ring-2 ring-amber-300" : ""}`}
                   onClick={() => {
                     if (selectedIds.size > 0) {
@@ -534,9 +533,9 @@ export function MessageList() {
                       }
                       try {
                         await downloadFileFromUrl(url);
-                        setToast("File downloaded");
+                        showToast("File downloaded");
                       } catch {
-                        setToast("Download failed");
+                        showToast("Download failed");
                       } finally {
                         setCtx(null);
                       }
@@ -554,9 +553,9 @@ export function MessageList() {
                       }
                       try {
                         await navigator.clipboard.writeText(url);
-                        setToast("Link copied");
+                        showToast("Link copied");
                       } catch {
-                        setToast("Copy failed");
+                        showToast("Copy failed");
                       } finally {
                         setCtx(null);
                       }
@@ -657,11 +656,6 @@ export function MessageList() {
           </div>
         </div>
       ) : null}
-      {toast ? (
-        <div className="pointer-events-none absolute bottom-3 left-0 right-0 z-[120] flex justify-center px-3">
-          <div className="rounded-lg border border-slate-700/80 bg-slate-900/95 px-3 py-2 text-xs text-slate-100 shadow-xl">{toast}</div>
-        </div>
-      ) : null}
     </div>
   );
 }

web/src/components/ToastViewport.tsx

@@ -0,0 +1,30 @@
+import { useEffect } from "react";
+import { createPortal } from "react-dom";
+import { useUiStore } from "../store/uiStore";
+
+export function ToastViewport() {
+  const message = useUiStore((s) => s.toastMessage);
+  const clearToast = useUiStore((s) => s.clearToast);
+
+  useEffect(() => {
+    if (!message) {
+      return;
+    }
+    const timer = window.setTimeout(() => clearToast(), 2200);
+    return () => window.clearTimeout(timer);
+  }, [message, clearToast]);
+
+  if (!message) {
+    return null;
+  }
+
+  return createPortal(
+    <div className="pointer-events-none fixed bottom-3 left-0 right-0 z-[300] flex justify-center px-3">
+      <div className="rounded-lg border border-slate-700/80 bg-slate-900/95 px-3 py-2 text-xs text-slate-100 shadow-xl">
+        {message}
+      </div>
+    </div>,
+    document.body
+  );
+}
+

web/src/pages/ChatsPage.tsx

@@ -104,21 +104,21 @@ export function ChatsPage() {
   }, [notificationsOpen]);
 
   return (
-    <main className="h-screen w-full p-2 text-text md:p-4">
+    <main className="h-screen w-full p-2 text-text md:p-3">
-      <div className="mx-auto flex h-full max-w-[1500px] gap-2 md:gap-4">
+      <div className="mx-auto flex h-full max-w-[1500px] gap-2 md:gap-3">
         <section className={`tg-panel overflow-hidden rounded-2xl ${activeChatId ? "hidden md:block md:w-[360px]" : "w-full md:w-[360px]"}`}>
           <ChatList />
         </section>
 
         <section className={`tg-panel tg-chat-wallpaper min-w-0 flex-1 overflow-hidden rounded-2xl ${activeChatId ? "flex" : "hidden md:flex"} flex-col`}>
-          <div className="flex items-center justify-between border-b border-slate-700/50 bg-slate-900/55 px-4 py-3">
+          <div className="flex h-16 items-center justify-between border-b border-slate-700/50 bg-slate-900/65 px-4">
             <div className="flex min-w-0 items-center gap-3">
               <button className="rounded-full bg-slate-700/70 px-2 py-1 text-xs md:hidden" onClick={() => setActiveChatId(null)}>
                 Back
               </button>
               {activeChatId ? (
-                <button className="rounded-full bg-slate-700/70 px-2 py-1 text-xs" onClick={() => setInfoOpen(true)}>
+                <button className="flex h-8 w-8 items-center justify-center rounded-full bg-slate-700/70 text-xs font-semibold" onClick={() => setInfoOpen(true)}>
-                  Info
+                  i
                 </button>
               ) : null}
               <div className="min-w-0">
@@ -126,9 +126,9 @@ export function ChatsPage() {
                 <p className="truncate text-xs text-slate-300/80">{activeChat ? headerMetaLabel(activeChat) : "Select a chat"}</p>
               </div>
             </div>
-            <div className="flex items-center gap-2">
+            <div className="flex items-center gap-1.5">
               <button
-                className="relative rounded-full bg-slate-700/70 px-3 py-1.5 text-xs font-semibold hover:bg-slate-600/80"
+                className="relative rounded-full bg-slate-700/70 px-2.5 py-1.5 text-xs font-semibold hover:bg-slate-600/80"
                 onClick={() => setNotificationsOpen(true)}
               >
                 Notifications
@@ -136,10 +136,10 @@ export function ChatsPage() {
                   <span className="ml-1 rounded-full bg-sky-500 px-1.5 py-0.5 text-[10px] text-slate-950">{notifications.length}</span>
                 ) : null}
               </button>
-              <button className="rounded-full bg-slate-700/70 px-3 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={() => setSearchOpen(true)}>
+              <button className="rounded-full bg-slate-700/70 px-2.5 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={() => setSearchOpen(true)}>
                 Search
               </button>
-              <button className="rounded-full bg-slate-700/70 px-3 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={logout}>
+              <button className="rounded-full bg-slate-700/70 px-2.5 py-1.5 text-xs font-semibold hover:bg-slate-600/80" onClick={logout}>
                 Logout
               </button>
             </div>

web/src/store/uiStore.ts

@@ -0,0 +1,14 @@
+import { create } from "zustand";
+
+interface UiState {
+  toastMessage: string | null;
+  showToast: (message: string) => void;
+  clearToast: () => void;
+}
+
+export const useUiStore = create<UiState>((set) => ({
+  toastMessage: null,
+  showToast: (message) => set({ toastMessage: message }),
+  clearToast: () => set({ toastMessage: null })
+}));
+