fix(ui): group creation error, chat UUIDs, file preview, action menu

Bug fixes:
- Group creation "[object Object]" error: removed dead pkcs8 import code
  that threw before GEK wrapping, added array detail handling in hubFetch
- Chat shows usernames instead of UUIDs (sender_name passed through node)
- Join button: navigate to group on "Already a member" instead of error

UI improvements:
- Loading spinner animation for async states (connecting, fetching)
- File action menu (3-dot dropdown: View, Download, Play)
- Click filename to preview inline (images, text/code files)
- FilePreview overlay for images and text files
- Chat file attachment button (upload to node + structured message)
- Chat attachment display (icon, filename, size)
- Member panel: "Group admin" badge instead of plain "Admin" text

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

1 files changed, 2 insertions, 1 deletions

diff --git a/packages/meshbay-hub/src/meshbay_hub/static/transport.js b/packages/meshbay-hub/src/meshbay_hub/static/transport.js
index 2f6680e..6cbcc3c 100644
--- a/packages/meshbay-hub/src/meshbay_hub/static/transport.js
+++ b/packages/meshbay-hub/src/meshbay_hub/static/transport.js
@@ -164,13 +164,14 @@ class MeshBayTransport {
     return msg.messages || [];
   }
 
-  async sendChat(payload, iteration, threadId) {
+  async sendChat(payload, iteration, threadId, senderName) {
     const msg = await this._sendAndWait({
       type: 'chat_msg',
       v: '0.1',
       payload: payload,
       iteration: iteration || 0,
       thread_id: threadId || null,
+      sender_name: senderName || null,
     });
     return msg;
   }