fix(ui,docs): normalize isOpen handling + fix Input placeholder/label; tidy quotes

[JExcellence]

• Normalize isOpen prop behavior across interactive components and docs/examples
  (consistent controlled/uncontrolled behavior, SSR-safe defaults).
  Touched: Dialog.tsx, DialogExample.tsx, dialog.mdx,
  DropdownWrapper.tsx, DropdownWrapperExample.tsx, dropdownWrapper.mdx,
  ContextMenu.tsx, Select.tsx, Kbar.tsx, ComponentsCheckPage.tsx

• Input: resolve placeholder/label overlap + ID wiring

  • Correct label/placeholder interaction and focus/blur states
  • Ensure htmlFor ↔ id pairing; improve a11y (aria-*)
  • Styling tweaks in Input.module.scss; updated examples
    Touched: Input.module.scss, InputExamples.tsx, TextareaExamples.tsx

• Misc cleanups

  • Quote consistency (' → " where needed), minor TS/prop nits
  • Example + demo updates (Countdown/Count/TypeFx, Date* pickers, CTA, Button, etc.)
    Touched: Accordion.tsx, Button.tsx, ChartHeader.tsx, CountdownFxExample.tsx,
    CountFxExample.tsx, Cta.tsx, DateInput.tsx, DatePicker.tsx,
    DatePickerExamples.tsx, DateRangeInput.tsx, emojiPickerDropdown.mdx,
    EmojiPickerDropdownExample.tsx, error.tsx, Select.tsx,
    ToastExample.tsx, TypeFxCustomExample.tsx

No breaking changes expected.

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