fix: count worktree branches in git extension numbering (#3054)

* fix: count worktree branches in git extension numbering

* fix: preserve literal plus branch prefixes

extensions/git/scripts/bash/create-new-feature-branch.sh

@@ -127,7 +127,7 @@ get_highest_from_specs() {
 
 # Function to get highest number from git branches
 get_highest_from_branches() {
-    git branch -a 2>/dev/null | sed 's/^[* ]*//; s|^remotes/[^/]*/||' | _extract_highest_number
+    git branch -a 2>/dev/null | sed -E 's/^[+*][[:space:]]+//; s/^[[:space:]]+//; s|^remotes/[^/]*/||' | _extract_highest_number
 }
 
 # Extract the highest sequential feature number from a list of ref names (one per line).

extensions/git/scripts/powershell/create-new-feature-branch.ps1

@@ -88,7 +88,7 @@ function Get-HighestNumberFromBranches {
         $branches = git branch -a 2>$null
         if ($LASTEXITCODE -eq 0 -and $branches) {
             $cleanNames = $branches | ForEach-Object {
-                $_.Trim() -replace '^\*?\s+', '' -replace '^remotes/[^/]+/', ''
+                $_.Trim() -replace '^[+*]?\s+', '' -replace '^remotes/[^/]+/', ''
             }
             return Get-HighestNumberFromNames -Names $cleanNames
         }