USBridge release-v3.0.104

v3.0.103 — Agent

Sunshine now downloads itself on Linux (x86_64) and Apple Silicon too, not just Windows. The agent no longer needs to bundle the Sunshine streaming backend on
these platforms — it fetches the fork's signed release itself on first use and keeps it updated from there, same flow Windows already had. Intel Macs and Linux
arm64 (where the fork doesn't publish a build yet) still ship Sunshine bundled as before.

v3.0.104 — Agent (macOS)

Redesigned the "no USB dongle detected" message. Tapping the USB Passthrough status chip on macOS, when no hardware dongle is plugged in, used to show a bare
technical error ("Plug in the USBridge USB/IP dongle"). It's now a proper info dialog that explains why macOS needs a physical dongle here at all (no USB/IP
driver of its own), and links out to a live example on usbridge.io instead of leaving people to guess what the dongle is even for.

Full Changelog: release-v3.0.102...release-v3.0.104