Add additional social media fields to vCard export with X- prefixes per RFC 2426

[Copilot]

Summary

This PR implements support for exporting all available social media fields in vCard format using proper X- custom field prefixes as specified in RFC 2426.

Changes Made

Core Implementation

• Extended vCard field support: Added 18 social media fields to vCard export including Twitter, GitHub, Facebook, LinkedIn, Instagram, YouTube, Twitch, and more
• RFC 2426 compliance: All custom fields use proper X- prefixes (e.g., X-TWITTER:, X-GITHUB:, X-FACEBOOK:)
• Backward compatibility: Existing vCard functionality remains unchanged

Technical Details

• Updated VCardFields type to include all social media fields
• Modified encodeVCardFields function to generate X- prefixed custom fields
• Extended vCardFieldsFromAppData to include all available social media data
• Added comprehensive tests to verify proper X- field generation

Files Modified

• src/model/v-card-url.ts: Core vCard generation logic
• src/model/v-card-url.test.ts: New tests for vCard field validation
• cspell.json: Added test data to dictionary

Testing

Automated Tests

• All existing tests continue to pass
• New tests verify X- field generation for social media handles
• Build and linting checks pass successfully

Manual Verification

Successfully tested vCard download with sample data containing all social media fields. The exported vCard properly includes:

BEGIN:VCARD
VERSION:3.0
X-TWITTER:johndoe
X-GITHUB:johndoe
X-FACEBOOK:john.doe
X-LINKEDIN:john-doe
X-INSTAGRAM:johndoe
X-YOUTUBE:johndoe
X-TWITCH:johndoe
X-XING:johndoe
X-PAYPAL:johndoe
X-PATREON:johndoe
X-PINTEREST:johndoe
X-NPM:johndoe
X-SOUNDCLOUD:johndoe
X-SNAPCHAT:johndoe
X-STEAM:johndoe
X-CPAN:johndoe
X-SIGNAL:johndoe
X-TELEGRAM:johndoe
N:John Doe
TITLE:Software Developer
TEL;TYPE=PREF:+1234567890
EMAIL;TYPE=PREF,INTERNET:john@example.com
URL:https://example.com
END:VCARD

Screenshot

The screenshot shows the Snappy Cards interface displaying all social media fields that are now properly exported in the vCard format.

Impact

• Enhanced functionality: Users can now export complete contact information including all social media profiles
• Standards compliance: Follows RFC 2426 specification for custom vCard fields
• No breaking changes: Existing vCard exports continue to work as before
• Improved user experience: One-click export of comprehensive contact information

Fixes #37.

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