v1.0.7

Add gi view command to open issues in default program (#17)

* Add issue #021: open command to launch markdown in default program

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Add gi view command to open issues in default program (#021)

Implements the view command that opens an issue's markdown file in the
system's default program (open on macOS, xdg-open on Linux).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* Close issue #021

* fix: PR 리뷰 피드백 반영

- Use fatih/color for success message in view command

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Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>