Hide secondary windows until the login UI is painted, open external links in the default browser, and add signed Githop auto-updates

Hop-State: A_06FPJAAEMY0VXGY9S90PE90
Hop-Proposal: R_06FPJA9RY0ZAWJ1K0K760W8
Hop-Task: T_06FPJ5688NFG8VWKSFCTZEG
Hop-Attempt: AT_06FPJ5688M08V2K0PEFVQX0

src-tauri/build.rs

@@ -8,6 +8,8 @@ fn main() {
             "has_web_session",
             "open_web_app",
             "open_login_window",
+            "open_external_url",
+            "reveal_window",
         ]),
     ))
     .unwrap();