feat(messaging-ui): Slack-style threaded-replies side panel

Replies (messages with parentInteractionId) now open in a right-hand ThreadPane instead of inline quoting: - extracted a shared Composer (draft + @mention autocomplete + attach) and MessageItem (bubble + mentions + attachment + reactions + reply affordance) - Thread shows top-level messages only; a message with replies gets a '💬 N replies' link, and hovering shows 💬 'Reply in thread' - ThreadPane renders the root + its replies + a composer that posts back with parentInteractionId; Messenger becomes 3-column (list | thread | pane), pane closes on conversation switch - no contract/adapter/backend change (parentInteractionId was already wired) - thread-pane render test (open → reply → parent shows the count); 58 green Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-22 00:29:54 +05:30
parent 7a0fb2ca97
commit fa93173b1f
8 changed files with 452 additions and 188 deletions
@@ -0,0 +1,107 @@
+import { useState } from 'react';
+import { highlightMentions } from '../mentions';
+import type { Attachment } from '../types';
+import type { UiMessage } from '../hooks/use-messages';
+
+const REACTION_EMOJIS = ['👍', '❤️', '😂', '🎉', '👀'];
+
+const isImage = (mime: string): boolean => mime.startsWith('image/');
+
+function AttachmentView({ att }: { att: Attachment }) {
+  if (isImage(att.mime)) {
+    return (
+      <a href={att.url} target="_blank" rel="noreferrer" className="miu-att-img-link">
+        <img src={att.url} alt={att.name} className="miu-att-img" />
+      </a>
+    );
+  }
+  return (
+    <a href={att.url} target="_blank" rel="noreferrer" className="miu-att-file">
+      📎 {att.name}
+    </a>
+  );
+}
+
+/** One rendered message: bubble (with @mention highlighting), attachment, reactions, seen tick,
+ *  and — in the main thread only — a thread/reply affordance. */
+export function MessageItem({
+  message,
+  memberNames,
+  canReact,
+  onReact,
+  seen,
+  replyCount,
+  onOpenThread,
+}: {
+  message: UiMessage;
+  memberNames: string[];
+  canReact: boolean;
+  onReact: (messageId: string, emoji: string) => void;
+  seen: boolean;
+  /** Present only in the main thread (not inside the pane). undefined => no thread affordance. */
+  replyCount?: number;
+  onOpenThread?: (messageId: string) => void;
+}) {
+  const [pickerOpen, setPickerOpen] = useState(false);
+  const m = message;
+
+  return (
+    <div className={`miu-msg${message.mine ? ' is-mine' : ''}${message.pending ? ' is-pending' : ''}`}>
+      <div className="miu-bubble-row">
+        <div className="miu-bubble">
+          {m.text ? highlightMentions(m.text, memberNames) : null}
+          {m.attachment ? <AttachmentView att={m.attachment} /> : null}
+        </div>
+        <div className="miu-msg-actions">
+          {canReact ? (
+            <div className="miu-react-wrap">
+              <button type="button" className="miu-react-btn" title="React" onClick={() => setPickerOpen((p) => !p)}>
+                🙂
+              </button>
+              {pickerOpen ? (
+                <div className="miu-react-picker">
+                  {REACTION_EMOJIS.map((e) => (
+                    <button
+                      key={e}
+                      type="button"
+                      className="miu-react-emoji"
+                      onClick={() => {
+                        onReact(m.id, e);
+                        setPickerOpen(false);
+                      }}
+                    >
+                      {e}
+                    </button>
+                  ))}
+                </div>
+              ) : null}
+            </div>
+          ) : null}
+          {onOpenThread ? (
+            <button type="button" className="miu-react-btn" title="Reply in thread" onClick={() => onOpenThread(m.id)}>
+              💬
+            </button>
+          ) : null}
+        </div>
+      </div>
+
+      {m.reactions && m.reactions.length > 0 ? (
+        <div className="miu-reactions">
+          {m.reactions.map((r) => (
+            <button key={r.emoji} type="button" className={`miu-reaction${r.mine ? ' is-mine' : ''}`} onClick={() => canReact && onReact(m.id, r.emoji)}>
+              {r.emoji} {r.count}
+            </button>
+          ))}
+        </div>
+      ) : null}
+
+      {replyCount !== undefined && replyCount > 0 && onOpenThread ? (
+        <button type="button" className="miu-thread-link" onClick={() => onOpenThread(m.id)}>
+          💬 {replyCount} {replyCount === 1 ? 'reply' : 'replies'}
+        </button>
+      ) : null}
+
+      {message.mine && seen ? <span className="miu-seen">Seen</span> : null}
+    </div>
+  );
+}