feat: init hey pro

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What does this PR do?

🤖 Generated by Copilot at 022709c

This pull request adds a new UI component and a feature flag for the Pro feature. It also updates some existing components to include the Pro component in the navbar and the mobile drawer menu, depending on the feature flag.

Related issues

Fixes # (issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Enhancement (non-breaking small changes to existing functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Explanation of the changes

🤖 Generated by Copilot at 022709c

• Add a new Pro component that renders a link to the /pro page with a briefcase icon and the text "Pro" (link)
• Import and conditionally render the Pro component in the MobileDrawerMenu component, which is a sidebar menu for mobile devices (MobileDrawerMenu.tsx, link, link)
• Import and conditionally render the Pro component in the SignedUser component, which is a dropdown menu for signed-in users (SignedUser.tsx, link, link)
• Add a new feature flag ProImplementation to the FeatureFlag enum, which is used to toggle the visibility of the Pro component (feature-flags.ts, link)
• Add a comment to the feature-flags.ts file to indicate that the enum values above the comment are static flags, meaning that they are hardcoded in the codebase (link)

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