UI Polish: Multi-Author Support & Inline Code Styling

This commit adds support for multiple authors on posts and refines the inline code styling across the site.

Multi-Author Support

Type Changes

Updated PostMeta interface to support both single and multiple authors:

Before: author?: string;
After: author?: string | string[];

Also added optional authorshipNote?: string field for explaining authorship context via tooltip.

ContentHeader Component

Updated to handle author arrays with Array.isArray() check and join(', ') formatting. Changed "Author:" prefix to cleaner "By" format.

Implemented hover tooltip for authorship notes:

• Pill background on hover (subtle white overlay)
• Tooltip appears above text when authorshipNote is present
• White background with black text, 150px width, text wrapping
• Smooth transitions and shadow for depth

Example Usage

The programs-not-documents post now demonstrates collaborative authorship:

author: ['Claude', 'Jay Griffin']
authorshipNote: 'AI-synthesized from Jay\'s rants about markdown and content architecture'

Inline Code Styling Refinement

Visual Updates

Refined the Code primitive styling for better visual hierarchy:

• Color: Electric blue hsl(210, 100%, 60%) instead of theme text color
• Border: Left accent border (2px) with 33% opacity primary color instead of full border
• Padding: Reduced to 0.15em 0.4em 0.15em 0.35em for tighter fit
• Shadow: Subtle shadow 0 1px 3px rgba(0, 0, 0, 0.03) for depth

Heading Cleanup

Removed first-of-type margin-top rule from heading styles - unnecessary constraint that was causing layout issues.

Technical Details

Backward Compatibility

Union type implementation maintains full backward compatibility - existing posts with single author strings continue working without changes.

Tooltip Implementation

Pure CSS tooltip using ::after pseudo-element with positioning and transforms. No JavaScript required. Conditional rendering based on authorshipNote presence.

Files Modified

• src/types/post.ts - Added union type and authorshipNote field
• src/components/ContentHeader.tsx - Array handling, tooltip implementation, text formatting
• src/components/Primitives.tsx - Inline code styling, heading cleanup
• src/posts/programs-not-documents.tsx - Example multi-author usage