feat(gateway): sign in with a Nous account from a chat (/login), one shared sign-in flow (#105261)

* refactor(auth): one sign-in flow behind SignInState, rendered by the CLI and the desktop

* feat(gateway): /signin signs the free tier into a Nous account from a DM

* feat(cli): chat surfaces name /signin as the sign-in verb

* fix(auth): review follow-ups for the shared sign-in flow and /signin

* fix(i18n): carry the /status free-tier line in every locale catalog

* refactor(cli): the chat sign-in command is /login

* fix(auth): durable override cleanup in the /login sweep, and the sign-in flow in its own modules

locales/af.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Laaste aktiwiteit:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · gratis vlak · nous/welcome · /login om aan te meld"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/ar.yaml

@@ -343,6 +343,7 @@ gateway:
     last_activity:         "**آخر نشاط:** {timestamp}"
     model:                 "**النموذج:** `{model}`"
     model_provider:        "**النموذج:** `{model}` ({provider})"
+    free_tier:             "Nous · الخطة المجانية · nous/welcome · /login لتسجيل الدخول"
     context:               "**السياق:** {used} / {total} ({pct}%)"
     context_used:          "**السياق:** ~{used} رمزًا"
     tokens:                "**رموز API التراكمية (تُعاد كل استدعاء):** {tokens}"

locales/de.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Letzte Aktivität:** {timestamp}"
     model:                 "**Modell:** `{model}`"
     model_provider:        "**Modell:** `{model}` ({provider})"
+    free_tier:             "Nous · kostenloser Tarif · nous/welcome · /login zum Anmelden"
     context:               "**Kontext:** {used} / {total} ({pct}%)"
     context_used:          "**Kontext:** ~{used} Tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/en.yaml

@@ -354,6 +354,7 @@ gateway:
     last_activity:         "**Last Activity:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · free tier · nous/welcome · /login to sign in"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/es.yaml

@@ -338,6 +338,7 @@ gateway:
     last_activity:         "**Última actividad:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · plan gratuito · nous/welcome · /login para iniciar sesión"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/fr.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Dernière activité :** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · offre gratuite · nous/welcome · /login pour se connecter"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/ga.yaml

@@ -345,6 +345,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Gníomhaíocht is déanaí:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · plean saor in aisce · nous/welcome · /login chun síniú isteach"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/hu.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Utolsó tevékenység:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · ingyenes csomag · nous/welcome · /login a bejelentkezéshez"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/it.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Ultima attività:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · piano gratuito · nous/welcome · /login per accedere"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/ja.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**最終アクティビティ:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · 無料プラン · nous/welcome · /login でログイン"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/ko.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**최종 활동:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · 무료 요금제 · nous/welcome · /login 명령으로 로그인"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/pt.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Última atividade:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · plano gratuito · nous/welcome · /login para entrar"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/ru.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Последняя активность:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · бесплатный тариф · nous/welcome · /login для входа"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/tr.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Son etkinlik:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · ücretsiz plan · nous/welcome · /login ile giriş yapın"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/uk.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**Остання активність:** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · безкоштовний тариф · nous/welcome · /login для входу"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/zh-hant.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**最近活動：** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · 免費方案 · nous/welcome · /login 登入"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"

locales/zh.yaml

@@ -341,6 +341,7 @@ Future messages in this room will use that transcript until `/reset` or another
     last_activity:         "**最近活动：** {timestamp}"
     model:                 "**Model:** `{model}`"
     model_provider:        "**Model:** `{model}` ({provider})"
+    free_tier:             "Nous · 免费套餐 · nous/welcome · /login 登录"
     context:               "**Context:** {used} / {total} ({pct}%)"
     context_used:          "**Context:** ~{used} tokens"
     tokens:                "**Lifetime tokens billed:** {tokens} _(not your current context size; use `/context`)_"