Add RBS type signatures for error classes

[justin808]

Summary

Add RBS type signatures for all error-related classes to complete type coverage for the gem.

Changes Made

• Added RBS signatures for ReactOnRails::Error base class
• Added RBS signatures for ReactOnRails::JsonParseError with error context methods
• Added RBS signatures for ReactOnRails::PrerenderError with detailed rendering info
• Added RBS signatures for ReactOnRails::SmartError with actionable suggestions
• Removed duplicate definitions from main sig/react_on_rails.rbs file

Classes Added

1. Error (sig/react_on_rails/error.rbs): Base error class inheriting from StandardError
2. JsonParseError (sig/react_on_rails/json_parse_error.rbs): JSON parsing error with context
3. PrerenderError (sig/react_on_rails/prerender_error.rbs): Server rendering error with detailed info
4. SmartError (sig/react_on_rails/smart_error.rbs): Enhanced error with actionable suggestions

Testing

• ✅ RBS validation passes (bundle exec rake rbs:validate)
• ✅ RuboCop passes with no offenses
• ✅ No duplicate definitions

Impact

These signatures provide type information for error handling, helping developers catch type-related issues during development. This is purely additive and doesn't affect runtime behavior.

Fixes #1954

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between cbee429 and e0302ea.

📒 Files selected for processing (5)

• sig/react_on_rails.rbs (0 hunks)
• sig/react_on_rails/error.rbs (1 hunks)
• sig/react_on_rails/json_parse_error.rbs (1 hunks)
• sig/react_on_rails/prerender_error.rbs (1 hunks)
• sig/react_on_rails/smart_error.rbs (1 hunks)

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch justin808/rbs-error-classes

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[justin808]

Closing this PR as the work was already completed and merged in PR #2004. Issue #1954 has been resolved.