fix(git): filter out detached state from branch list

[tugrulates]

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PR Overview

This PR aims to fix the issue where the detached HEAD state is mistakenly included in the branch list by filtering it out.

• Added a filter in the branch list to remove branches with a space, which is intended to filter out the detached HEAD state.
• Updated tests to ensure that branches in a detached HEAD state are properly handled for listing and deletion.

Reviewed Changes

File	Description
core/git/git.ts	Added a filter to remove branch names containing spaces to exclude detached HEAD state.
core/git/git.test.ts	Added tests to check branch listing and deletion behavior when in the detached HEAD state.

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Comments suppressed due to low confidence (1)

core/git/git.ts:581

• Filtering branch names using a check for spaces might inadvertently exclude legitimate branch names if they ever include spaces. Consider using a more targeted method to filter out the detached HEAD state or adding a comment clarifying that branch names with spaces are not supported.

.filter((x) => !x.includes(" "))