feat(posting): add scoped options and qst formatting (#1135)

* feat(posting): add scoped options and qst formatting

* fix(posting): address post options review feedback

* fix(posting): sync option content before publish

* fix(posting): handle final review nits

src/lib/utils/__tests__/post-options-utils.test.ts

@@ -0,0 +1,8 @@
+import { describe, expect, it } from 'vitest';
+import { getUnsupportedPostOptionsMessage } from '../post-options-utils';
+
+describe('post-options-utils', () => {
+  it('rejects additional dice options instead of dropping them', () => {
+    expect(getUnsupportedPostOptionsMessage('dice+1d6 dice+1d20', 'qst')).toBe('unsupported options: dice+1d20');
+  });
+});