fix: replace xargs trim with sed to handle quotes in descriptions

[mnriem]

Summary

create-new-feature.sh uses xargs to strip surrounding whitespace from the FEATURE_DESCRIPTION argument. Because xargs re-parses its stdin as shell-like tokens, any input containing a single quote ('), double quote ("), or backslash (\) aborts with xargs: unterminated quote.

Natural-language descriptions frequently include apostrophes (user's, can't, etc.), so this is easy to trigger in normal usage.

Changes

Replace the xargs call with a sed-based trim in both locations:

• scripts/bash/create-new-feature.sh (line 87)
• extensions/git/scripts/bash/create-new-feature.sh (line 98)

# Before
FEATURE_DESCRIPTION=$(echo "$FEATURE_DESCRIPTION" | xargs)

# After
FEATURE_DESCRIPTION=$(echo "$FEATURE_DESCRIPTION" | sed -E 's/^[[:space:]]+|[[:space:]]+$//g')

The PowerShell equivalents already use .Trim() and are not affected.

Tests

Added TestDescriptionQuoting class to tests/test_timestamp_branches.py with 10 tests:

• 8 positive tests — apostrophes, double quotes, backslashes, and mixed special characters succeed in both core and extension scripts
• 1 negative test — whitespace-only descriptions are still rejected
• 1 regression guard — plain descriptions continue to work

Full suite: 1677 passed.

Fixes #2339

[Copilot]

Pull request overview

Fixes a quoting bug in the create-new-feature.sh whitespace-trimming step by replacing xargs (which re-parses input and fails on quotes/backslashes) with a sed-based trim, and adds regression tests to ensure descriptions containing special characters work in both core and extension scripts.

Changes:

• Replace FEATURE_DESCRIPTION trimming from xargs to a quote-safe sed expression in both bash scripts.
• Add pytest coverage for apostrophes, double quotes, and backslashes (core + extension), plus whitespace-only rejection and a plain-description guard.

Show a summary per file

File	Description
scripts/bash/create-new-feature.sh	Switches whitespace trimming to sed to avoid xargs quote/backslash parsing failures.
extensions/git/scripts/bash/create-new-feature.sh	Applies the same trim fix to the git extension’s create-new-feature.sh.
tests/test_timestamp_branches.py	Adds regression tests for issue #2339 covering special characters and whitespace-only descriptions.

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• Files reviewed: 3/3 changed files
• Comments generated: 0