fix: prevent message horizontal overflow with proper text wrapping

Message Layout Improvements:
- Added proper padding to message items (px-3 py-2)
- Added flex-1 min-w-0 to message content container to allow shrinking
- Added break-words and overflow-hidden to prevent horizontal overflow
- Ensures long URLs and unbreakable text wrap properly

Message Composer Improvements:
- Added border-t and consistent padding (px-3 py-2)
- Added border and rounded-md to textarea for better visual separation
- Added min-w-0 to textarea to prevent overflow in flex layout
- Added flex-shrink-0 to Send button to prevent squishing
- Added mb-2 to reply preview for spacing

These changes ensure:
- Long messages and URLs wrap correctly without horizontal scroll
- Consistent spacing throughout the chat interface
- Proper flex behavior prevents layout breaks
- Professional chat UI appearance

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/components/ChatViewer.tsx

@@ -39,15 +39,15 @@ const MessageItem = memo(function MessageItem({
   conversation: Conversation;
 }) {
   return (
-    <div className="group flex items-start hover:bg-muted/50">
+    <div className="group flex items-start hover:bg-muted/50 px-3 py-2">
-      <div className="">
+      <div className="flex-1 min-w-0">
         <div className="flex items-center gap-2">
           <UserName pubkey={message.author} className="font-semibold text-sm" />
           <span className="text-xs text-muted-foreground">
             <Timestamp timestamp={message.timestamp} />
           </span>
         </div>
-        <div className="text-sm leading-relaxed">
+        <div className="text-sm leading-relaxed break-words overflow-hidden">
           {message.event ? (
             <RichText event={message.event}>
               {message.replyTo && (
@@ -59,7 +59,9 @@ const MessageItem = memo(function MessageItem({
               )}
             </RichText>
           ) : (
-            <span className="whitespace-pre-wrap">{message.content}</span>
+            <span className="whitespace-pre-wrap break-words">
+              {message.content}
+            </span>
           )}
         </div>
       </div>
@@ -177,9 +179,9 @@ export function ChatViewer({
       </div>
 
       {/* Message composer */}
-      <div className="">
+      <div className="border-t px-3 py-2">
         {replyTo && (
-          <div className="flex items-center gap-2 rounded bg-muted px-2 py-1 text-xs">
+          <div className="flex items-center gap-2 rounded bg-muted px-2 py-1 text-xs mb-2">
             <span>Replying to {replyTo.slice(0, 8)}...</span>
             <button
               onClick={() => setReplyTo(undefined)}
@@ -207,7 +209,7 @@ export function ChatViewer({
             name="message"
             autoFocus
             placeholder="Type a message..."
-            className="flex-1 resize-none bg-background px-2 py-1.5 text-sm"
+            className="flex-1 resize-none bg-background px-3 py-2 text-sm border rounded-md min-w-0"
             rows={1}
             onKeyDown={(e) => {
               // Submit on Enter (without Shift)
@@ -217,7 +219,7 @@ export function ChatViewer({
               }
             }}
           />
-          <Button type="submit" variant="secondary">
+          <Button type="submit" variant="secondary" className="flex-shrink-0">
             Send
           </Button>
         </form>

src/lib/chat/adapters/nip-29-adapter.ts

@@ -282,7 +282,7 @@ export class Nip29Adapter extends ChatProtocolAdapter {
     const filter: Filter = {
       kinds: [9],
       "#h": [groupId],
-      limit: options?.limit || 200,
+      limit: options?.limit || 50,
     };
 
     if (options?.before) {