feat(frontend): add create channel action in channel pane

src/pages/ChatPage.tsx

@@ -19,6 +19,7 @@ export default function ChatPage() {
   const [channels, setChannels] = useState<GuildChannel[]>([])
   const [messages, setMessages] = useState<MessageItem[]>([])
   const [content, setContent] = useState('')
+  const [newChannelName, setNewChannelName] = useState('')
   const [loading, setLoading] = useState(false)
   const [error, setError] = useState('')
 
@@ -97,6 +98,20 @@ export default function ChatPage() {
     }
   }
 
+  async function createChannel() {
+    if (!guild || !guildToken || !newChannelName.trim()) return
+    setError('')
+    try {
+      const res = await guildApi().post('/channels', { name: newChannelName.trim() })
+      const createdId = res.data?.id as string | undefined
+      setNewChannelName('')
+      await loadChannels()
+      if (createdId) setSelectedChannelId(createdId)
+    } catch {
+      setError('Failed to create channel')
+    }
+  }
+
   useEffect(() => {
     void loadChannels()
     setMessages([])
@@ -146,6 +161,15 @@ export default function ChatPage() {
 
         <div className="panel col-list">
           <h3>Channels</h3>
+          <div className="row-wrap" style={{ marginBottom: 8 }}>
+            <input
+              className="input"
+              value={newChannelName}
+              onChange={(e) => setNewChannelName(e.target.value)}
+              placeholder="New channel name"
+            />
+            <button className="btn btn-secondary" onClick={createChannel}>Create channel</button>
+          </div>
           <ul className="list-reset">
             {channels.map((c) => (
               <li key={c.id}>