refactor: replace hardcoded error string with i18n translation lookup

- Remove `NoSessionPatternUserMessages` constant from `chatter.go`
- Replace direct constant reference with `i18n.T()` translation call
- Update test import from `core` package to `i18n` package
- Update test assertion to use localized error message lookup

internal/cli/cli_test.go

@@ -4,7 +4,7 @@ import (
 	"os"
 	"testing"
 
-	"github.com/danielmiessler/fabric/internal/core"
+	"github.com/danielmiessler/fabric/internal/i18n"
 
 	"github.com/stretchr/testify/assert"
 )
@@ -17,5 +17,5 @@ func TestCli(t *testing.T) {
 	os.Args = []string{os.Args[0]}
 	err := Cli("test")
 	assert.Error(t, err)
-	assert.Equal(t, core.NoSessionPatternUserMessages, err.Error())
+	assert.Equal(t, i18n.T("chatter_error_no_session_pattern_user_messages"), err.Error())
 }

internal/core/chatter.go

@@ -17,8 +17,6 @@ import (
 	"github.com/danielmiessler/fabric/internal/plugins/template"
 )
 
-const NoSessionPatternUserMessages = "no session, pattern or user messages provided"
-
 type Chatter struct {
 	db *fsdb.Db