appview: settings: use `chi.Router.Mount`

and move appview/state/settings to appview/settings

appview/state/router.go

···
 
 	"github.com/go-chi/chi/v5"
 	"tangled.sh/tangled.sh/core/appview/middleware"
-	"tangled.sh/tangled.sh/core/appview/state/settings"
+	"tangled.sh/tangled.sh/core/appview/settings"
 	"tangled.sh/tangled.sh/core/appview/state/userutil"
 )
 
···
 		r.Delete("/", s.Star)
 	})
 
-	r.Route("/settings", s.SettingsRouter)
+	r.Mount("/settings", s.SettingsRouter())
 
 	r.Get("/keys/{user}", s.Keys)
 
···
 	return r
 }
 
-func (s *State) SettingsRouter(r chi.Router) {
+func (s *State) SettingsRouter() http.Handler {
 	settings := &settings.Settings{
 		Db:     s.db,
 		Auth:   s.auth,
···
 		Config: s.config,
 	}
 
-	settings.Router(r)
+	return settings.Router()
 }

appview/state/settings/settings.go appview/settings/settings.go

···
 	Config *appview.Config
 }
 
-func (s *Settings) Router(r chi.Router) {
+func (s *Settings) Router() http.Handler {
+	r := chi.NewRouter()
+
 	r.Use(middleware.AuthMiddleware(s.Auth))
 
 	r.Get("/", s.settings)
-	r.Put("/keys", s.keys)
-	r.Delete("/keys", s.keys)
-	r.Put("/emails", s.emails)
-	r.Delete("/emails", s.emails)
-	r.Get("/emails/verify", s.emailsVerify)
-	r.Post("/emails/verify/resend", s.emailsVerifyResend)
-	r.Post("/emails/primary", s.emailsPrimary)
+
+	r.Route("/keys", func(r chi.Router) {
+		r.Put("/", s.keys)
+		r.Delete("/", s.keys)
+	})
+
+	r.Route("/emails", func(r chi.Router) {
+		r.Put("/", s.emails)
+		r.Delete("/", s.emails)
+		r.Get("/verify", s.emailsVerify)
+		r.Post("/verify/resend", s.emailsVerifyResend)
+		r.Post("/primary", s.emailsPrimary)
+	})
 
+	return r
 }
 
 func (s *Settings) settings(w http.ResponseWriter, r *http.Request) {

flake.lock

···
     "indigo": {
       "flake": false,
       "locked": {
-        "lastModified": 1738491661,
-        "narHash": "sha256-+njDigkvjH4XmXZMog5Mp0K4x9mamHX6gSGJCZB9mE4=",
+        "lastModified": 1745333930,
+        "narHash": "sha256-83fIHqDE+dfnZ88HaNuwfKFO+R0RKAM1WxMfNh/Matk=",
         "owner": "oppiliappan",
         "repo": "indigo",
-        "rev": "feb802f02a462ac0a6392ffc3e40b0529f0cdf71",
+        "rev": "e4e59280737b8676611fc077a228d47b3e8e9491",
         "type": "github"
       },
       "original": {