docs: add FUTURE_WORK quality standard and close polish gaps

Replace CODE_REVIEW.md with a living maturity checklist, document
session-only History, inject Service into newMainView for testability,
add UI and scheduler regression tests, and fix RunNow error surfacing
plus empty jobs view handling.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/ui/mainwindow_test.go

@@ -0,0 +1,56 @@
+package ui
+
+import (
+	"path/filepath"
+	"testing"
+
+	"gitea.mixdep.ru/mix/gosentry/src/app"
+	"gitea.mixdep.ru/mix/gosentry/src/domain"
+	"gitea.mixdep.ru/mix/gosentry/src/storage"
+
+	"fyne.io/fyne/v2/test"
+)
+
+func newTestService(t *testing.T) *app.Service {
+	t.Helper()
+	dir := t.TempDir()
+	store := &storage.Store{
+		Paths: storage.Paths{
+			ExecutablePath: filepath.Join(dir, "gosentry"),
+			AppDir:         dir,
+			ConfigPath:     filepath.Join(dir, "gosentry.json"),
+			JobsDir:        dir,
+			JobsPath:       filepath.Join(dir, "jobs.json"),
+			LogsDir:        filepath.Join(dir, "logs"),
+		},
+		Config: domain.Config{
+			JobsDir:         ".",
+			LogsDir:         "logs",
+			MaxLogFiles:     100,
+			MaxLogAgeDays:   30,
+			ExecutionMode:   domain.ExecutionModeParallel,
+			OverlapPolicy:   domain.OverlapPolicySkip,
+			KeepRunningInTray: true,
+			NotifyOnFailure:   true,
+		},
+	}
+	return app.NewService(store, nil)
+}
+
+func TestMainViewBuilds(t *testing.T) {
+	testApp := test.NewApp()
+	defer testApp.Quit()
+
+	w := testApp.NewWindow("test")
+	defer w.Close()
+
+	svc := newTestService(t)
+	defer svc.Stop()
+
+	content, recordStartup := newMainView(w, svc)
+	if content == nil {
+		t.Fatal("newMainView returned nil content")
+	}
+	w.SetContent(content)
+	recordStartup(0, true)
+}