feat: with nothing to show, the right pane says how to get started

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

internal/ui/app/app_test.go

@@ -1236,3 +1236,36 @@ func TestStatusPane(t *testing.T) {
 		t.Errorf("back to %v", d.m.focus)
 	}
 }
+
+// empty is an account with nothing in it, like Databricks without profiles.
+type empty struct{ provider.Provider }
+
+func (empty) Sources(context.Context) ([]provider.Source, error) { return nil, nil }
+
+func TestGetStarted(t *testing.T) {
+	t.Parallel()
+	d := newDriverOpts(t, Options{}, signedOut{fake.Azure(0)}, empty{fake.Databricks(0)})
+	scr := d.screen()
+	for _, want := range []string{"get started", "Azure      az login", "L runs it here",
+		"databricks auth login --host", "lazysecrets --demo"} {
+		if !strings.Contains(scr, want) {
+			t.Errorf("missing %q:\n%s", want, scr)
+		}
+	}
+	d.keys("l", "j")
+	if a := d.m.loginFor(); a == nil || a.Account != "Azure · admin" {
+		t.Errorf("L signs in to %+v", a)
+	}
+	d.keys("y")
+	if got := d.clip().content; got != "az login" {
+		t.Errorf("y copied %q", got)
+	}
+
+	// Once an account has something, an empty one says what it needs.
+	d = newDriverOpts(t, Options{}, fake.Azure(0), empty{fake.Databricks(0)})
+	d.m.sources.SelectWhere(func(r sourceRow) bool { return r.kind == rowGroup && r.provider == fake.Databricks(0).ID() })
+	d.send(nil)
+	if scr := d.screen(); strings.Contains(scr, "get started") || !strings.Contains(scr, "databricks auth login") {
+		t.Errorf("empty Databricks:\n%s", scr)
+	}
+}