The `useFocusManager().activeId` entry conflated two things and buried the
load-bearing one. Split and reframe:
- The real divergence is framework-semantic, not API-specific: a React hook
re-runs each render so it can return a plain snapshot, whereas a Vue
composable's setup() runs once and must wrap reactive state in a `shallowRef`.
Moved to the Vue != React section as a general rule; `activeId` is now just
one example of it.
- Folded the empty-value convention (`null` vs Ink's `undefined`) into that
entry as a Vue ecosystem idiom rather than a separate headline.
Doc-only.
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Yunfei He
11e9a2e684