fix: consolidate API key settings URL into a single constant

The old /settings/api path no longer exists. Replace all occurrences
with the working https://app.heygen.com/settings?nav=API URL and
extract it as APIKeySettingsURL in internal/errors so every hint
references the same constant.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: somanshreddy

cmd/heygen/auth.go

@@ -1,10 +1,14 @@
 package main
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/spf13/cobra"
+
+	clierrors "github.com/heygen-com/heygen-cli/internal/errors"
+)
 
 // authGuidance is the single source of truth for how to set up CLI auth.
 // Referenced by auth_login.go, auth_status.go, and the auth group help below.
-const authGuidance = `Three ways to provide your API key:
+var authGuidance = `Three ways to provide your API key:
   1. Environment variable (current shell only):
        export HEYGEN_API_KEY=<your-key>
   2. Pipe to auth login (saves to ~/.heygen/credentials):
@@ -14,7 +18,7 @@ const authGuidance = `Three ways to provide your API key:
 
 When both env var and stored credential are set, the env var takes priority.
 
-Get a key: https://app.heygen.com/settings/api`
+Get a key: ` + clierrors.APIKeySettingsURL
 
 func newAuthCmd(ctx *cmdContext) *cobra.Command {
 	cmd := newCommandGroup("auth", "Manage authentication")

cmd/heygen/auth_status_test.go

@@ -82,7 +82,7 @@ func TestAuthStatus_AuthError_AddsHint(t *testing.T) {
 	if !strings.Contains(res.Stderr, "HEYGEN_API_KEY environment variable") {
 		t.Fatalf("stderr should mention env var source:\n%s", res.Stderr)
 	}
-	if !strings.Contains(res.Stderr, "app.heygen.com/settings/api") {
+	if !strings.Contains(res.Stderr, "app.heygen.com/settings?nav=API") {
 		t.Fatalf("stderr should contain key generation URL:\n%s", res.Stderr)
 	}
 }
@@ -124,7 +124,7 @@ func TestAuthStatus_NoKey(t *testing.T) {
 	if !strings.Contains(res.Stderr, "Three ways to provide your API key") {
 		t.Fatalf("stderr = %s, want auth guidance", res.Stderr)
 	}
-	if !strings.Contains(res.Stderr, "app.heygen.com/settings/api") {
+	if !strings.Contains(res.Stderr, "app.heygen.com/settings?nav=API") {
 		t.Fatalf("stderr = %s, want key URL in hint", res.Stderr)
 	}
 }

cmd/heygen/context.go

@@ -79,9 +79,9 @@ func enrichAuthHint(cliErr *clierrors.CLIError, source auth.CredentialSource) {
 	credPath := filepath.Join(paths.ConfigDir(), "credentials")
 	switch source {
 	case auth.SourceEnv:
-		cliErr.Hint = "The HEYGEN_API_KEY environment variable contains an invalid or expired key.\nGenerate a new key: https://app.heygen.com/settings/api"
+		cliErr.Hint = "The HEYGEN_API_KEY environment variable contains an invalid or expired key.\nGenerate a new key: " + clierrors.APIKeySettingsURL
 	case auth.SourceFile:
-		cliErr.Hint = fmt.Sprintf("The stored API key (%s) is invalid or expired.\nReplace it: heygen auth login\nGenerate a new key: https://app.heygen.com/settings/api", credPath)
+		cliErr.Hint = fmt.Sprintf("The stored API key (%s) is invalid or expired.\nReplace it: heygen auth login\nGenerate a new key: %s", credPath, clierrors.APIKeySettingsURL)
 	}
 }
 

cmd/heygen/context_test.go

@@ -27,7 +27,7 @@ func TestEnrichAuthHint_EnvSource_401(t *testing.T) {
 	if !strings.Contains(res.Stderr, "HEYGEN_API_KEY environment variable") {
 		t.Fatalf("stderr should mention env var source:\n%s", res.Stderr)
 	}
-	if !strings.Contains(res.Stderr, "app.heygen.com/settings/api") {
+	if !strings.Contains(res.Stderr, "app.heygen.com/settings?nav=API") {
 		t.Fatalf("stderr should contain key generation URL:\n%s", res.Stderr)
 	}
 }

internal/errors/errors.go

@@ -12,6 +12,8 @@ const (
 	ExitTimeout = 4
 )
 
+const APIKeySettingsURL = "https://app.heygen.com/settings?nav=API"
+
 // CLIError is the canonical error type for all CLI operations.
 type CLIError struct {
 	Code      string // machine-readable: "auth_error", "not_found", "network_error"
@@ -131,7 +133,7 @@ func hintForAPICode(code string) string {
 	case "voice_not_found":
 		return "This voice does not exist. Retrying the same ID is unlikely to help. List voices: heygen voice list"
 	case "insufficient_credit":
-		return "Check your credit balance: heygen user me get. Purchase API credits: https://app.heygen.com/settings?nav=API"
+		return "Check your credit balance: heygen user me get. Purchase API credits: " + APIKeySettingsURL
 	case "invalid_parameter":
 		return "Use --request-schema on the command to see expected fields"
 	case "rate_limited":