feat: chat notifications via hub, file delete, upload fix, cached display, inline thumbnails

Backend:
- Chat store persists sender_name (SQLite migration, no more UUID display)
- FILE_DELETE / FILE_DELETE_ACK MNP types — node admin can delete files
- Node sends chat_notify to hub WS — hub creates notifications for offline members
- Hub revocation.py handles chat_notify, creates per-member notifications

Frontend:
- Upload chunk size 64KB (was 1MB) — fixes WebRTC DataChannel max-message-size
- Show cached files immediately while WebRTC connects
- ChatImage component — inline image thumbnails in chat (download+decrypt)
- File delete action in menu (group admin, with confirm dialog)
- Member panel: "Owner" label instead of confusing "Group admin"
- Create group page: hint about needing a node
- Refresh index after chat attachment upload

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 36 insertions, 0 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/api/revocation.py b/packages/meshbay-hub/src/meshbay_hub/api/revocation.py
index 8f65f89..00258c1 100644
--- a/packages/meshbay-hub/src/meshbay_hub/api/revocation.py
+++ b/packages/meshbay-hub/src/meshbay_hub/api/revocation.py
@@ -99,6 +99,36 @@ def _sign_revocation(target: str, target_id: str, reason: str) -> str:
 # ── WebSocket endpoint ────────────────────────────────────────────────────────
 
 @router.websocket("/v1/nodes/ws")
+async def _handle_chat_notify(group_id: str, sender_name: str, sender_user_id: str) -> None:
+    """Node informs hub that a chat message was posted — create notifications for offline members."""
+    if not group_id:
+        return
+    try:
+        from meshbay_hub.db.engine import get_session_factory
+        from meshbay_hub.db.models import GroupMember, Group
+        from meshbay_hub.api.notifications import create_notification
+
+        async with get_session_factory()() as db:
+            group = await db.get(Group, group_id)
+            if not group:
+                return
+            result = await db.execute(
+                select(GroupMember.user_id).where(GroupMember.group_id == group_id)
+            )
+            member_ids = [r[0] for r in result.all()]
+            for uid in member_ids:
+                if uid == sender_user_id:
+                    continue
+                await create_notification(
+                    db, uid, "chat_message",
+                    f"{sender_name or 'Someone'} posted in {group.name}",
+                    link=f"#/group/{group_id}",
+                )
+            await db.commit()
+    except Exception as e:
+        log.warning("Chat notify failed: %s", e)
+
+
 async def node_websocket(ws: WebSocket):
     """
     Persistent WebSocket connection for nodes.
@@ -145,6 +175,12 @@ async def node_websocket(ws: WebSocket):
             elif msg.get("type") == "webrtc_answer":
                 from meshbay_hub.api.signaling import handle_webrtc_answer
                 handle_webrtc_answer(msg)
+            elif msg.get("type") == "chat_notify":
+                asyncio.ensure_future(_handle_chat_notify(
+                    msg.get("group_id", ""),
+                    msg.get("sender_name", ""),
+                    decoded.get("sub", ""),
+                ))
 
     except WebSocketDisconnect:
         log.info("Node WS disconnected: %s", (node_id or "unknown")[:8])