refactor: move errors related code into separate file

[opheliagoldstein]

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[opheliagoldstein]

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Pull Request Overview

This PR refactors error-related code by extracting error classes and constants from the common utilities module into a dedicated error module. This improves code organization and separation of concerns.

• Moves CustomError and MissingParamError classes from utils.js to new error.js file
• Updates all import statements across the codebase to reference the new error module
• Adds TypeScript type hints and improves documentation in some files

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/common/error.js	New file containing extracted error classes and constants
src/common/utils.js	Removes error-related code and imports from new error module
src/common/index.js	Updates exports to remove error classes
src/common/retryer.js	Updates imports and adds TypeScript annotations
src/fetchers/*.js	Updates imports to use new error module location
src/cards/stats.js	Updates import statement for CustomError
tests/renderStatsCard.test.js	Updates import statement for CustomError

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