Translate all Japanese comments to English

[Copilot]

This PR translates all Japanese comments throughout the TypeScript codebase to English to improve code accessibility and maintainability for international contributors.

Changes Made

• Base types (base.ts, change.ts): Translated comments for line metadata, page information, and change operations
• API types: Translated comments across all API endpoint types including:
  • Commit history (api/commits/)
  • Page data export/import (api/page-data/)
  • Page snapshots (api/page-snapshots/)
  • Search functionality (api/pages/project/search/)
  • Project backup (api/project-backup/)
• Node types (node/): Translated comments for Scrapbox notation parsing including icons, decorations, media links, quotes, and indentation
• Error types (error.ts): Translated comprehensive error handling documentation
• Layout types (layout.ts): Translated page type definitions
• Utility types (scrapbox.ts, blocks.ts): Translated button configuration and section marker comments

Examples

Before:

/** Scrapboxの行のメタデータ */
export interface BaseLine {
  /** 行のテキスト */
  text: string;
  /** 一番最後に行を編集した人のid */
  userId: UserId;
}

After:

/** scrapbox line metadata */
export interface BaseLine {
  /** text of the line */
  text: string;
  /** id of the user who last edited the line */
  userId: UserId;
}

Technical Details

• All translations preserve the exact technical meaning and context
• No functional code changes were made - only comment translations
• All existing tests pass
• Code formatting maintained with Deno formatter
• Comprehensive coverage of ~66 Japanese comments across the entire codebase

This change makes the codebase more accessible to international developers while maintaining all existing functionality and technical accuracy.

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