Fix stale cmd/ scripts, export LoginWithChromedp, clean up vet warnings

Update 5 cmd/ test utilities that referenced APIs that drifted after
bridge refactors (NewBrowserAuthManager, bridge.NewConfig, changed
function signatures). Rewrite test-kosmi and test-native to use
NewGraphQLWSClient directly. Export LoginWithChromedp for use by cmd
scripts. Fix redundant-newline vet warnings across 5 cmd/ files.
Remove unreachable code and replace deprecated ioutil calls in
bridge/helper/lottie_convert.go.

Made-with: Cursor

bridge/kosmi/kosmi.go

@@ -82,7 +82,7 @@ func (b *Bkosmi) Connect() error {
 		} else {
 			// No valid cache, authenticate with browser
 			b.Log.Info("Authenticating with email/password...")
-			token, err = loginWithChromedp(email, password, b.Log)
+			token, err = LoginWithChromedp(email, password, b.Log)
 			if err != nil {
 				return fmt.Errorf("authentication failed: %w", err)
 			}