test: fix 5 TUI rendering tests to use i18n.T() instead of hardcoded strings

- choices_test.go: use i18n.T("choices.input.other") for input field check
- input_test.go: use i18n.T("client.ui.input.placeholder") for placeholder
- statusbar_test.go: use i18n.T("client.status.idle") for state checks
- modelselect_test.go: use i18n.T("setup.model.select.title") for title check

These tests failed after gofmt because source code uses i18n translations
while tests had hardcoded Chinese strings that no longer match.

Author: DotNetAge

internal/client/component/choices/choices_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	tea "charm.land/bubbletea/v2"
+	"github.com/DotNetAge/mindx/internal/i18n"
 	clientmsg "github.com/DotNetAge/mindx/internal/client/msg"
 )
 
@@ -293,7 +294,7 @@ func TestMultiSelectWithTextInput(t *testing.T) {
 	}
 
 	view := p.View()
-	if !strings.Contains(view, "其他:") {
+	if !strings.Contains(view, i18n.T("choices.input.other")) {
 		t.Errorf("view should show custom input field, got %q", view)
 	}
 }

internal/client/component/input/input_test.go

@@ -5,6 +5,7 @@ import (
 	"testing"
 
 	tea "charm.land/bubbletea/v2"
+	"github.com/DotNetAge/mindx/internal/i18n"
 	"github.com/DotNetAge/mindx/internal/client/data"
 	clientmsg "github.com/DotNetAge/mindx/internal/client/msg"
 )
@@ -45,7 +46,7 @@ func TestInputAreaViewEmpty(t *testing.T) {
 	if !strings.Contains(v, "❯") {
 		t.Error("View() should contain prompt '❯'")
 	}
-	if !strings.Contains(v, "发送消息或") {
+	if !strings.Contains(v, i18n.T("client.ui.input.placeholder")) {
 		t.Error("View() should contain placeholder '发送消息或...'")
 	}
 }

internal/client/component/statusbar/statusbar_test.go

@@ -4,6 +4,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/DotNetAge/mindx/internal/i18n"
 	"github.com/DotNetAge/mindx/internal/client/data"
 	clientmsg "github.com/DotNetAge/mindx/internal/client/msg"
 )
@@ -13,8 +14,8 @@ func TestNewStatusBar(t *testing.T) {
 	if s == nil {
 		t.Fatal("New() returned nil")
 	}
-	if s.CurrentState != "空闲" {
-		t.Errorf("expected CurrentState %q, got %q", "空闲", s.CurrentState)
+	if s.CurrentState != i18n.T("client.status.idle") {
+		t.Errorf("expected CurrentState %q, got %q", i18n.T("client.status.idle"), s.CurrentState)
 	}
 	if s.SessionName != "" {
 		t.Errorf("expected empty SessionName, got %q", s.SessionName)
@@ -32,16 +33,16 @@ func TestNewStatusBar(t *testing.T) {
 
 func TestStatusBarViewIdle(t *testing.T) {
 	s := New()
-	s.CurrentState = "空闲"
+	s.CurrentState = i18n.T("client.status.idle")
 	view := s.View()
 	if view == "" {
 		t.Fatal("View() returned empty string")
 	}
 	if !strings.Contains(view, "●") {
 		t.Errorf("View() should contain ●, got %q", view)
 	}
-	if !strings.Contains(view, "空闲") {
-		t.Errorf("View() should contain 空闲, got %q", view)
+	if !strings.Contains(view, i18n.T("client.status.idle")) {
+		t.Errorf("View() should contain %s, got %q", i18n.T("client.status.idle"), view)
 	}
 }
 

internal/setup/component/modelselect/modelselect_test.go

@@ -5,6 +5,7 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/DotNetAge/mindx/internal/i18n"
 	setupdata "github.com/DotNetAge/mindx/internal/setup/data"
 )
 
@@ -25,7 +26,7 @@ func TestViewContainsGradientTitle(t *testing.T) {
 	t.Logf("\n=== View Output ===\n%s\n=== End ===", view)
 
 	plain := stripANSI(view)
-	if !strings.Contains(plain, "选择一个 AI 模型") {
+	if !strings.Contains(plain, i18n.T("setup.model.select.title")) {
 		t.Error("View output does NOT contain '选择一个 AI 模型'")
 	} else {
 		t.Log("✅ View output contains '选择一个 AI 模型'")