Add YouTrack pull/push sync with project settings and time tracking.

Wire manual Y menu and CLI sync for issues and work items, persist
per-project credentials, and keep local edits until an explicit push.

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

internal/ui/views/projectedit_test.go

@@ -0,0 +1,40 @@
+package views_test
+
+import (
+	"testing"
+
+	"task/internal/project"
+	"task/internal/ui/views"
+)
+
+func TestProjectEditMetaKeepsToken(t *testing.T) {
+	prev := project.Meta{
+		YouTrack: &project.YouTrack{
+			BaseURL:    "https://yt.example",
+			Token:      "secret",
+			ProjectKey: "ABC",
+		},
+	}
+	f := views.NewProjectEditForm("inbox", prev, 80)
+	// Leave token blank → keep previous.
+	f.Inputs[views.FieldRemoteURL].SetValue("https://yt.example")
+	f.Inputs[views.FieldProjectKey].SetValue("ABC")
+	f.Inputs[views.FieldToken].SetValue("")
+
+	meta := f.Meta(prev)
+	if meta.YouTrack == nil || meta.YouTrack.Token != "secret" {
+		t.Fatalf("expected kept token, got %+v", meta.YouTrack)
+	}
+	if err := f.Validate(prev); err != nil {
+		t.Fatalf("Validate: %v", err)
+	}
+}
+
+func TestProjectEditValidateIncomplete(t *testing.T) {
+	f := views.NewProjectEditForm("inbox", project.Meta{}, 80)
+	f.Inputs[views.FieldRemoteURL].SetValue("https://yt.example")
+	// missing token + key
+	if err := f.Validate(project.Meta{}); err == nil {
+		t.Fatal("expected incomplete error")
+	}
+}