Improve error messages with more context and details

[Luladjiev]

No description provided.

[Copilot]

Pull Request Overview

This PR improves error messages throughout the Git utility codebase by adding more context and specific details to help users better understand and resolve issues.

• Enhanced error messages with specific variable values and context
• Added helpful hints for troubleshooting (e.g., network connectivity, manual commands)
• Improved variable naming in some functions for clarity

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/utils.rs	Enhanced error messages with branch names and troubleshooting hints
src/commands/rebase.rs	Added specific branch names and git commands to error messages
src/commands/fixup.rs	Improved commit selection error messages and variable naming
src/commands/delete_branches.rs	Added context about network connectivity and branch parsing details
src/commands/cherry_pick.rs	Enhanced commit selection and parsing error messages
src/commands/checkout.rs	Improved branch listing and selection error messages with branch type context
src/commands/branch.rs	Added specific branch names to creation error messages
src/commands.rs	Enhanced git command execution error messages with actual commands

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