Show Add Project search loading state (#1762)

* fix(app): show add project search loading state

The Add Project picker now treats a typed value that is ahead of the debounced directory search as an active search, so empty results show a loading message instead of the initial prompt or a blank list.

* fix(app): avoid overlapping project picker states

packages/app/src/i18n/resources.test.ts

@@ -388,6 +388,7 @@ describe("translation resources", () => {
   it("includes picker, file pane, and tool detail keys for the Batch 4L migration", () => {
     expect(en.projectPicker.placeholder).toBe("Type a directory path...");
     expect(en.projectPicker.opening).toBe("Opening project...");
+    expect(en.projectPicker.searching).toBe("Searching...");
     expect(en.projectPicker.empty).toBe("Start typing a path");
     expect(en.branchSwitcher.currentBranch).toBe(
       "Current branch: {{branchName}}. Press to switch branch.",

packages/app/src/i18n/resources/ar.ts

@@ -1054,6 +1054,7 @@ export const ar: TranslationResources = {
   projectPicker: {
     placeholder: "اكتب مسار الدليل...",
     opening: "افتتاح المشروع...",
+    searching: "جارٍ البحث...",
     empty: "ابدأ بكتابة المسار",
     errors: {
       directory_not_found: "لم يتم العثور على الدليل.",

packages/app/src/i18n/resources/en.ts

@@ -1060,6 +1060,7 @@ export const en = {
   projectPicker: {
     placeholder: "Type a directory path...",
     opening: "Opening project...",
+    searching: "Searching...",
     empty: "Start typing a path",
     errors: {
       directory_not_found: "Directory not found.",

packages/app/src/i18n/resources/es.ts

@@ -1087,6 +1087,7 @@ export const es: TranslationResources = {
   projectPicker: {
     placeholder: "Escriba una ruta de directorio...",
     opening: "Proyecto de apertura...",
+    searching: "Buscando...",
     empty: "Comience a escribir una ruta",
     errors: {
       directory_not_found: "No se encontró el directorio.",

packages/app/src/i18n/resources/fr.ts

@@ -1089,6 +1089,7 @@ export const fr: TranslationResources = {
   projectPicker: {
     placeholder: "Tapez un chemin de répertoire...",
     opening: "Projet d'ouverture...",
+    searching: "Recherche en cours...",
     empty: "Commencez à taper un chemin",
     errors: {
       directory_not_found: "Répertoire introuvable.",

packages/app/src/i18n/resources/ja.ts

@@ -1067,6 +1067,7 @@ export const ja: TranslationResources = {
   projectPicker: {
     placeholder: "ディレクトリパスを入力...",
     opening: "プロジェクトを開いています...",
+    searching: "検索中...",
     empty: "パスを入力してください",
     errors: {
       directory_not_found: "ディレクトリが見つかりません。",

packages/app/src/i18n/resources/pt-BR.ts

@@ -1073,6 +1073,7 @@ export const ptBR: TranslationResources = {
   projectPicker: {
     placeholder: "Digite um caminho de diretório...",
     opening: "Abrindo projeto...",
+    searching: "Buscando...",
     empty: "Comece digitando um caminho",
     errors: {
       directory_not_found: "Diretório não encontrado.",

packages/app/src/i18n/resources/ru.ts

@@ -1077,6 +1077,7 @@ export const ru: TranslationResources = {
   projectPicker: {
     placeholder: "Введите путь к каталогу...",
     opening: "Открытие проекта...",
+    searching: "Идет поиск...",
     empty: "Начните вводить путь",
     errors: {
       directory_not_found: "Каталог не найден.",

packages/app/src/i18n/resources/zh-CN.ts

@@ -1039,6 +1039,7 @@ export const zhCN: TranslationResources = {
   projectPicker: {
     placeholder: "输入目录路径...",
     opening: "正在打开 project...",
+    searching: "正在搜索...",
     empty: "开始输入路径",
     errors: {
       directory_not_found: "找不到目录。",