feat: add independent CLI launches and preserve shared video bookmarks

Sources/CLI/TerebiCLI.swift

@@ -14,7 +14,7 @@ enum TerebiCLI {
         switch command {
         case .help:
             print(PlayerCommand.usage)
-        case .launch(let url):
+        case .launch(let url, let newInstance):
             guard let executable = Bundle.main.executableURL else {
                 fail("Could not locate the CLI executable.", code: 69)
             }
@@ -24,10 +24,14 @@ enum TerebiCLI {
                 fail(error, code: 69)
             }
             let configuration = NSWorkspace.OpenConfiguration()
+            configuration.createsNewApplicationInstance = newInstance
+            if newInstance, let url {
+                configuration.arguments = ["--open-media", url.absoluteString]
+            }
             do {
-                // Launch without media first so SwiftUI creates its singleton window.
+                // Launch an application, not a document, so SwiftUI creates its singleton window.
                 _ = try await NSWorkspace.shared.openApplication(at: app, configuration: configuration)
-                if let url {
+                if !newInstance, let url {
                     _ = try await NSWorkspace.shared.open([url], withApplicationAt: app, configuration: configuration)
                 }
             } catch {