[Formplayer] Likert scale question type

[r0ssing]

Add a custom Likert Scale question type for ODE, focused on a flexible and user-friendly control UX.

The control should support common Likert-style response patterns, including:

• Agreement scales: Strongly disagree → Strongly agree
• Frequency scales: Never → Always
• Satisfaction scales: Very dissatisfied → Very satisfied
• Importance scales: Not important → Very important
• Likelihood scales: Very unlikely → Very likely
• Numeric rating scales: e.g. 0–10, 1–5, 1–7
• Sentiment scales: emoji/smiley-based responses

Potential display options:

• Horizontal segmented buttons
• Radio-button row
• Emoji/smiley row
• Numeric 0–10 scale
• Horizontal slider control
• Compact mobile-friendly stacked layout
• Optional labels at endpoints only, or labels on every option

UX considerations:

• Clearly indicate the selected value
• Support keyboard navigation and screen readers
• Work well on mobile and desktop
• Allow configurable labels, values, min/max, and step size
• Support optional neutral/midpoint values
• Support "Not applicable" where configured
• Support translation of all user-facing text (labels, option text, endpoint labels, etc.) using the standard ODE i18n/localization mechanism
• Preserve existing form validation and required-question behavior
• Ensure the control can render consistently in readonly/review mode

Implementation scope:

• Add the Likert Scale as a custom question type in ODE
• Support configurable display variants such as numeric, emoji, buttons, radio row, and slider
• Add a Storybook component for the Likert control in formplayer
• Include stories for major variants, required state, disabled/readonly state, validation/error state, translated labels, and mobile-friendly layouts
• Update relevant documentation to describe configuration options, supported display modes, accessibility behavior, localization support, and example usage

Acceptance criteria:

• A Likert Scale question can be configured and rendered in ODE
• Users can select a response using the chosen display style
• The selected value is saved consistently with the configured option values
• All user-facing text is translatable using the existing ODE i18n support
• The control supports accessible labels, keyboard interaction, and visible focus states
• Storybook includes examples for the main display variants, including localized examples
• Documentation is updated with usage guidance and examples

[r0ssing]

Let's make sure we test it in both stacked and two-column layout modes :-)