Improve onboarding defaults and issue goal fallback

server/src/services/issue-goal-fallback.ts

@@ -0,0 +1,30 @@
+type MaybeId = string | null | undefined;
+
+export function resolveIssueGoalId(input: {
+  projectId: MaybeId;
+  goalId: MaybeId;
+  defaultGoalId: MaybeId;
+}): string | null {
+  if (!input.projectId && !input.goalId) {
+    return input.defaultGoalId ?? null;
+  }
+  return input.goalId ?? null;
+}
+
+export function resolveNextIssueGoalId(input: {
+  currentProjectId: MaybeId;
+  currentGoalId: MaybeId;
+  projectId?: MaybeId;
+  goalId?: MaybeId;
+  defaultGoalId: MaybeId;
+}): string | null {
+  const projectId =
+    input.projectId !== undefined ? input.projectId : input.currentProjectId;
+  const goalId =
+    input.goalId !== undefined ? input.goalId : input.currentGoalId;
+
+  if (!projectId && !goalId) {
+    return input.defaultGoalId ?? null;
+  }
+  return goalId ?? null;
+}