refactor: split main.ts into domain runtimes

backlog/tasks/task-262 - Create-overlay-UI-bootstrap-input-helper.md

@@ -0,0 +1,27 @@
+---
+id: TASK-262
+title: Create overlay UI bootstrap input helper
+status: To Do
+assignee: []
+created_date: '2026-03-31 17:04'
+labels:
+  - refactor
+  - main
+  - overlay-ui
+dependencies: []
+---
+
+## Description
+
+<!-- SECTION:DESCRIPTION:BEGIN -->
+Add a coarse input-builder/helper module to reduce the large createOverlayUiRuntime(...) callsite in src/main.ts without changing runtime behavior. Do not edit src/main.ts in this task.
+<!-- SECTION:DESCRIPTION:END -->
+
+## Acceptance Criteria
+<!-- AC:BEGIN -->
+- [ ] #1 New helper module(s) live under src/main/
+- [ ] #2 Helper accepts grouped overlay UI/domain inputs instead of giant inline literals
+- [ ] #3 Helper keeps files under 500 LOC
+- [ ] #4 Optional focused tests added if useful
+- [ ] #5 No runtime behavior changes
+<!-- AC:END -->