fix: branch detection now correctly filters HEAD and arrow entries

- grep -v '\->' removes the 'origin/HEAD -> origin/main' line
- grep -v '^HEAD$' removes stray HEAD entries
- sed trims whitespace and strips 'origin/' prefix
- sort -u deduplicates across repos
- Result: only clean branch names like 'main', 'dev', 'Dev'

update-Nitrov3.sh

@@ -1689,13 +1689,21 @@ detect_available_branches() {
     local result=()
     for repo in "${repos[@]}"; do
         [ -d "$repo/.git" ] || continue
-        for b in $(cd "$repo" && git branch -r 2>/dev/null | sed 's/origin\///' | xargs 2>/dev/null); do
+        local branches
+        branches=$(cd "$repo" && git branch -r 2>/dev/null | \
+            grep -v '\->' | \
+            sed 's/^[[:space:]]*//' | \
+            sed 's/^origin\///' | \
+            grep -v '^HEAD$' | \
+            sort -u)
+        while IFS= read -r b; do
+            [ -z "$b" ] && continue
             local found=false
             for ab in "${result[@]}"; do
                 [ "$ab" = "$b" ] && found=true && break
             done
             $found || result+=("$b")
-        done
+        done <<< "$branches"
     done
     printf '%s\n' "${result[@]}"
 }