Add variable fonts data to Google Fonts database

[Copilot]

This PR enhances the Google Fonts package to include comprehensive variable font information, adding axis data for 30+ popular variable fonts.

Changes Made

🎯 Enhanced Type System

• Added FontAxis type with tag, name, min, max, default properties
• Extended Font type with isVariable boolean and optional axes array
• Maintains full backward compatibility with existing code

📊 Comprehensive Variable Fonts Database

Added detailed axis information for 30+ popular variable fonts including:

• Inter - Weight axis (100-900)
• Roboto Flex - 13 axes including Grade, Opaque, Width, Slant, Optical Size
• Open Sans - Width and Weight axes
• DM Sans - Optical Size and Weight axes
• Recursive - Casual, Cursive, Monospace, Slant, Weight axes
• And 25+ more fonts with standard axes (wght, wdth, slnt, opsz)

🛡️ Robust Error Handling

• Stops gracefully when API key is denied (403) or invalid (400) as requested
• Clear error messages for different API failure scenarios
• Validates response structure before processing

🧪 Comprehensive Testing

• 6 test suites with 76 assertions covering:
  • Variable font detection logic
  • Type safety validation
  • Real-world usage patterns
  • Edge case handling

Usage Example

import { googleFonts } from '@remotion/google-fonts';

// Find all variable fonts
const variableFonts = googleFonts.filter(font => font.isVariable);

// Get axis information for Inter
const inter = googleFonts.find(font => font.family === 'Inter');
if (inter?.isVariable && inter.axes) {
  console.log(inter.axes);
  // Output: [{ tag: 'wght', name: 'Weight', min: 100, max: 900, default: 400 }]
}

// Access complex variable font data
const robotoFlex = googleFonts.find(font => font.family === 'Roboto Flex');
console.log(robotoFlex?.axes?.length); // 13 axes available

API Key Requirement

The update script now properly handles API key requirements and stops with clear error messages when access is denied, as specified in the issue.

# Set your Google Fonts API key
export GOOGLE_FONTS_API_KEY=your_api_key_here
bun scripts/update-font-db.ts

Fixes #5446.

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Name	Status	Preview	Comments	Updated (UTC)
bugs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2025 3:13pm
remotion	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 20, 2025 3:13pm