Merge branch 'main' into fix/pkce-flow-session-extend

Both sides extended the OAuth flow entry points: main threads a login hint
through GetOAuthFlow/NewOAuthFlow, this branch threads a sessionExtend flag.
The merged signatures carry both.

client/android/login.go keeps main's structure — the hint reaches the flow
through GetOAuthFlow rather than a loginHintSetter assertion, profile email
helpers live in client/mobile, and runOAuthFlow is the shared driver — with
this branch's sessionExtend plumbing and wrong-account retry layered on top.
The branch's runInteractiveFlow is dropped in favour of runOAuthFlow.

client/android/ssh_client.go is new from main and merged without conflict,
but calls NewOAuthFlow; SSH login is a fresh login, so it passes false.

management.pb.go regenerated with the pinned protoc-gen-go v1.26 from
generate.sh. The .proto merged cleanly: main's LazyState and proxy_embedded
are disjoint from this branch's SessionExtend field.

client/cmd/service_controller.go

@@ -45,8 +45,8 @@ func daemonServerOptions(network string) []grpc.ServerOption {
 		return nil
 	}
 
-	creds := ipcauth.NewTransportCredentials()
-	if creds == nil {
+	creds := ipcauth.NewTransportCredentials() //nolint:staticcheck
+	if creds == nil {                          //nolint:staticcheck // nil only on platforms without a peer-identity primitive
 		log.Warnf("daemon IPC has no peer-identity primitive on %s: privileged operations will be denied", runtime.GOOS)
 		return nil
 	}

client/cmd/service_socket.go

@@ -27,8 +27,8 @@ func listenOnAddress(addr string) (*socketListener, error) {
 	}
 
 	if network == "npipe" {
-		listener, path, err := listenNamedPipe(address)
-		if err != nil {
+		listener, path, err := listenNamedPipe(address) //nolint:staticcheck
+		if err != nil {                                 //nolint:staticcheck // always errors on non-Windows builds
 			return nil, err
 		}
 		return &socketListener{Listener: listener, network: network, address: path}, nil

client/cmd/testutil_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"github.com/golang/mock/gomock"
+	"go.uber.org/mock/gomock"
 	"github.com/stretchr/testify/require"
 	"go.opentelemetry.io/otel"
 	"google.golang.org/grpc"