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gsxdsm 4a9fe9957d FN-6504: allow attachment-only chat sends

Allow chat composers and API routes to deliver attachment-only messages without placeholder text.

- Permit main chat sends when staged attachments exist even if the textarea is blank.
- Accept upload-backed and referenced attachment-only payloads in chat and room message routes while still rejecting fully empty messages.
- Add UI/API regression coverage, documentation, and a patch changeset for attachment-only chat sends.

Files changed:
 .changeset/fn-6504-attachment-only-send.md         |  5 ++
 docs/dashboard-guide.md                            |  1 +
 packages/dashboard/app/components/ChatView.tsx     | 72 ++++++++++++++++++++--
 .../app/components/__tests__/ChatView.test.tsx     | 39 ++++++++++++
 .../src/__tests__/chat-attachment-routes.test.ts   | 24 +++++++-
 .../src/__tests__/chat-routes.rooms.test.ts        | 62 +++++++++++++------
 .../src/routes/register-chat-room-routes.ts        | 13 +++-
 .../dashboard/src/routes/register-chat-routes.ts   | 21 ++++---
 8 files changed, 205 insertions(+), 32 deletions(-)

Fusion-Task-Id: FN-6504

Fusion-Task-Lineage: f64f7874-4e32-4ae5-a5b1-d8c4b78e23dd

2026-06-17 02:39:36 -07:00