fix(page-controller): support ARIA dropdown option selection

[voidborne-d]

Summary

• keep native <select> handling as-is
• add a combobox fallback that opens the trigger, resolves popup roots via aria-controls / aria-owns, and clicks visible matching options
• support common portaled dropdown patterns used by Ant Design, Element Plus, and other ARIA listbox implementations

Validation

• npm install
• npm run build:libs
• npm run lint -- packages/page-controller/src/actions.ts

Closes #290

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