fix(CookieConsent): add comprehensive Storybook controls

[garrity-miepub]

• Add argTypes for all controllable props including showDecline and showCustomize
• Add boolean controls for isVisible, showDecline, showCustomize, isMobileApp
• Add text controls for message, acceptText, declineText, customizeText, appName
• Add select controls for position and variant (already existed, now with descriptions)
• Disable controls for complex link props (termsLink, privacyLink, cookieLink)
• Add action handlers for onAccept, onDecline, onCustomize callbacks
• Add default args at meta level with sensible defaults
• Add Playground story for easy testing of all controls
• Clean up existing stories to remove redundant args that are inherited from meta
• Remove inline onAccept handlers that were overriding action handlers

The showDecline and showCustomize controls now work properly in the Storybook Controls panel, allowing dynamic toggling of these buttons.

cookie-consent-updates.mov

[Copilot]

Pull request overview

This PR enhances the CookieConsent Storybook configuration by adding comprehensive controls for all component props, enabling dynamic testing of the cookie consent banner through Storybook's Controls panel.

Changes:

• Added comprehensive argTypes for all CookieConsent props with appropriate control types (boolean, text, select) and descriptions
• Configured action handlers for callback props (onAccept, onDecline, onCustomize) to enable event tracking in Storybook
• Added sensible default args at the meta level to reduce duplication across stories
• Introduced a new Playground story for interactive testing of all controls
• Cleaned up individual stories by removing redundant args that now inherit from meta defaults

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