Mobile app doesn't show threaded replies visible on Desktop

Replies sent via the Buzz CLI (`buzz messages send --reply-to `) into a channel thread are visible in Buzz Desktop but do not appear in the mobile app, even after the parent message and thread are open.

**Steps to reproduce:**
1. Have an agent reply to a channel message using `--reply-to ` (creates a NIP-10 threaded reply).
2. View the channel on mobile — the reply doesn't show up.
3. View the same channel/thread on Desktop — the reply shows up correctly.

**Example event IDs** (all correctly tagged as replies, confirmed via `buzz messages get`):
- `455d40444e458ed53e3d6dd141b398736fe3f5fef3cfb0a2195d6c60a7553c6d`
- `768e6f62d4b47cd253eae0131452cbabc2e92f8d65a4373fa6b415bd2f4e17a2`
- `137841583fa64ce6a332e067cfc59a28a0b8750257281c41034797101e318ead`

Channel: `94314e5c-436c-43f6-828a-32b2ac589d3f`