testing: cover select and dropdown behavior

[RtlZeroMemory]

Summary

• cover app-level select keyboard progression with disabled-option skipping and visible value updates
• cover dropdown outside-click close at the app contract level while retaining the existing item-click selection coverage
• keep the existing shared select scenario and lower-level dropdown routing/overlay suites in place

Families Covered

• select
• dropdown

Tests Added, Rewritten, Removed

• added app-level tests in packages/core/src/app/__tests__/widgetBehavior.contracts.test.ts for select keyboard progression and dropdown outside-click close
• rewrote no existing tests in this PR
• removed no tests in this PR because the retained shared scenario and lower-level dropdown suites still protect keyboard routing, overflow windowing, and overlay ownership contracts

Implementation Bugs Fixed

• none; the behavior-first tests passed once added

Commands Run

• ./node_modules/.bin/tsc -b packages/core/tsconfig.json --pretty false
• node --test packages/core/dist/app/__tests__/widgetBehavior.contracts.test.js
• node --test packages/core/dist/testing/__tests__/referenceScenario.semantic.test.js
• node --test packages/core/dist/app/__tests__/widgetRenderer.integration.test.js
• node --test packages/core/dist/widgets/__tests__/dropdown.position.test.js packages/core/dist/runtime/__tests__/overlayUnification.test.js

Unresolved Areas Left Explicit

• dropdown shortcut behavior remains covered at lower fidelity only; no new app-level shortcut assertion was added here
• long-menu visible-window behavior remains protected by retained lower-level dropdown windowing tests rather than a new app-level contract test
• table, tree, and virtual list re-audit remains separate from this PR

Dependency Note

• stacked on testing: cover modal, dialog, select, and dropdown behavior #370

#Closes 345

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