Enable plugin registry installs by default (#6224)

* feat(plugins): enable registry installs by default

* fix(plugins): explain explicit Git source for missing registry IDs

* fix(plugins): tailor missing registry guidance to installation

* test(app): sample footer geometry in one browser frame

* fix(plugins): make registry source resolution deterministic

Directory existence must not change the meaning of a registry identifier shared by CLI, RPC, and UI installs. Classify explicit host paths in the source parser and explain recovery from registry transport and revision-selection failures.

* fix(plugins): recognize dot and Windows directory sources

* test(cli): wait for readable daemon ownership before cancellation

The cancellation test raced PID-file creation against its first write and parsed empty JSON in CI. Use the public daemon-instance reader to wait for and capture the supervisor PID before asserting cancellation cleanup.

* test(app): expect missing directory install guidance

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

@@ -2160,7 +2160,7 @@ export const en = {
       globalTitle: "Enable plugins",
       globalHint: "Global switch for every configured plugin",
       sourceLabel: "Plugin source",
-      sourcePlaceholder: "Directory, Git URL, or npm package",
+      sourcePlaceholder: "owner/slug, directory, Git URL, or npm package",
       docs: "Docs",
       install: "Install plugin",
       installing: "Installing…",

packages/app/src/i18n/resources/plugin-settings.ts

@@ -27,7 +27,7 @@ export const pluginSettings = {
     globalTitle: "تفعيل الإضافات",
     globalHint: "مفتاح عام لكل الإضافات المضبوطة",
     sourceLabel: "مصدر الإضافة",
-    sourcePlaceholder: "مجلد أو رابط Git أو حزمة npm",
+    sourcePlaceholder: "owner/slug, مجلد أو رابط Git أو حزمة npm",
     docs: "الوثائق",
     install: "تثبيت الإضافة",
     installing: "جارٍ التثبيت…",
@@ -82,7 +82,7 @@ export const pluginSettings = {
     globalTitle: "Activar plugins",
     globalHint: "Interruptor global para todos los plugins configurados",
     sourceLabel: "Fuente del plugin",
-    sourcePlaceholder: "Directorio, URL de Git o paquete npm",
+    sourcePlaceholder: "owner/slug, Directorio, URL de Git o paquete npm",
     docs: "Documentación",
     install: "Instalar plugin",
     installing: "Instalando…",
@@ -137,7 +137,7 @@ export const pluginSettings = {
     globalTitle: "Activer les plugins",
     globalHint: "Interrupteur global pour tous les plugins configurés",
     sourceLabel: "Source du plugin",
-    sourcePlaceholder: "Dossier, URL Git ou paquet npm",
+    sourcePlaceholder: "owner/slug, Dossier, URL Git ou paquet npm",
     docs: "Documentation",
     install: "Installer le plugin",
     installing: "Installation…",
@@ -192,7 +192,7 @@ export const pluginSettings = {
     globalTitle: "プラグインを有効化",
     globalHint: "設定済みプラグインすべての共通スイッチ",
     sourceLabel: "プラグインソース",
-    sourcePlaceholder: "ディレクトリ、Git URL、npm パッケージ",
+    sourcePlaceholder: "owner/slug, ディレクトリ、Git URL、npm パッケージ",
     docs: "ドキュメント",
     install: "プラグインをインストール",
     installing: "インストール中…",
@@ -246,7 +246,7 @@ export const pluginSettings = {
     globalTitle: "플러그인 활성화",
     globalHint: "설정된 모든 플러그인의 전역 스위치",
     sourceLabel: "플러그인 소스",
-    sourcePlaceholder: "디렉터리, Git URL 또는 npm 패키지",
+    sourcePlaceholder: "owner/slug, 디렉터리, Git URL 또는 npm 패키지",
     docs: "문서",
     install: "플러그인 설치",
     installing: "설치 중…",
@@ -301,7 +301,7 @@ export const pluginSettings = {
     globalTitle: "Ativar plugins",
     globalHint: "Controle global para todos os plugins configurados",
     sourceLabel: "Fonte do plugin",
-    sourcePlaceholder: "Diretório, URL Git ou pacote npm",
+    sourcePlaceholder: "owner/slug, Diretório, URL Git ou pacote npm",
     docs: "Documentação",
     install: "Instalar plugin",
     installing: "Instalando…",
@@ -356,7 +356,7 @@ export const pluginSettings = {
     globalTitle: "Включить плагины",
     globalHint: "Общий переключатель для всех настроенных плагинов",
     sourceLabel: "Источник плагина",
-    sourcePlaceholder: "Каталог, URL Git или пакет npm",
+    sourcePlaceholder: "owner/slug, Каталог, URL Git или пакет npm",
     docs: "Документация",
     install: "Установить плагин",
     installing: "Установка…",
@@ -410,7 +410,7 @@ export const pluginSettings = {
     globalTitle: "启用插件",
     globalHint: "所有已配置插件的全局开关",
     sourceLabel: "插件来源",
-    sourcePlaceholder: "目录、Git URL 或 npm 包",
+    sourcePlaceholder: "owner/slug, 目录、Git URL 或 npm 包",
     docs: "文档",
     install: "安装插件",
     installing: "正在安装…",