fix(tui): share overlay close controls

- add reusable overlay key and help-text helpers for picker-style overlays
- make model, session, skills, and pager hints consistently support Esc/q close behavior

ui-tui/packages/hermes-ink/src/ink/dom.ts

@@ -345,6 +345,7 @@ const measureTextNode = function (
     // pathological frames where yoga probes many widths.
     if (cache.entries.size >= MEASURE_CACHE_CAP) {
       const firstKey = cache.entries.keys().next().value
+
       if (firstKey !== undefined) {
         cache.entries.delete(firstKey)
       }