Peter Schilling 430ac0402d feat: add user-friendly error handling with LINEAR_DEBUG support ...

Fixes #116

Error messages are now clean and user-friendly by default. Stack traces
are only shown when LINEAR_DEBUG=1 is set, similar to RUST_BACKTRACE.

Changes:
- Add src/utils/errors.ts with error handling infrastructure:
  - CliError base class with user-facing messages and suggestions
  - NotFoundError for entity lookups
  - ValidationError for invalid input
  - AuthError for authentication issues
  - handleError() for consistent error display
  - extractGraphQLMessage() to parse Linear API errors
- Update all commands to use handleError() for consistent error display
- Error output goes to stderr with ✗ prefix
- GraphQL errors show userPresentableMessage when available

Example before:
  Error: Entity not found: Issue: {"response":{"data":null...

Example after:
  ✗ Issue not found: FAKE-9999

2026-02-01 22:51:12 -08:00

3.4 KiB

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