Bash script creates duplicate feature numbers (filters by short name instead of checking all branches)

[armoucar]

Bug Description

The bash script .specify/scripts/bash/create-new-feature.sh generates duplicate feature numbers when multiple feature branches exist, similar to the PowerShell bug fixed in #1023.

Root Cause

The check_existing_branches function (lines 84-112) filters branches by the specific short_name:

# Line 91: Only matches branches with the SAME short name
grep -E "refs/heads/[0-9]+-${short_name}$"

This causes it to check only branches matching the current feature name pattern, not ALL branches globally.

Expected Behavior

Should scan all feature branches (like the non-git fallback in lines 201-207) and return the next global sequential number.

Actual Behavior

With existing specs 001-build-an-account and 002-oauth2-google-auth, running the script with --short-name multilingual-support creates 001-multilingual-support instead of 003-multilingual-support.

Fix

Apply the same fix from #1023: remove the short_name filter from check_existing_branches and match pattern refs/heads/[0-9]+- globally.

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Note: PowerShell version already fixed in #1023, bash version needs same treatment.