v0.1.3 — failed fetches stay visible, joined groups on screen

Three fixes found while staging screenshots — one of them matters.

• daemon: a failed fetch reported the offer as "available" — the file vanished from every "new in your groups" list and looked complete, though the bytes never arrived. failed is its own status now, and both apps show failed offers next to missing ones, ready to retry (asking is still the consent).
• macOS: joined groups were invisible in the window — the Sharing list filtered to drops you created, so there was no way to see or Leave a group you'd joined. There's a Groups section now, and the menu bar lists every drop you serve.
• macOS: transfers started from the CLI or another client showed as "file" after an app restart; the name table now also learns from offer listings.

104 tests passing, clippy clean. If you installed 0.1.2, replace it with this one.