fix dev_run.sh not stopping child processes on Ctrl-C

run_with_label piped output through a while loop, so $! tracked the
formatter PID instead of the actual command. Ctrl-C killed the formatters
but left app/worker/css-watch running as orphans. Switch to process
substitution so $! is the real command PID, and pkill -P children before
killing tracked PIDs.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

padelnomics/scripts/dev_run.sh

@@ -71,6 +71,8 @@ cleanup() {
     echo ""
     echo -e "${BOLD}Stopping all processes...${NC}"
     for pid in "${PIDS[@]}"; do
+        # Kill children first (e.g. make → tailwind), then the process itself
+        pkill -P "$pid" 2>/dev/null || true
         kill "$pid" 2>/dev/null || true
     done
     wait 2>/dev/null || true
@@ -81,12 +83,11 @@ cleanup() {
 trap cleanup SIGINT SIGTERM
 
 # Prefix each line of a command's output with a colored label.
+# Uses process substitution so $! is the actual command PID (not the formatter).
 run_with_label() {
     local color="$1" label="$2"
     shift 2
-    "$@" 2>&1 | while IFS= read -r line; do
-        echo -e "${color}[${label}]${NC} ${line}"
-    done &
+    "$@" > >(while IFS= read -r line; do echo -e "${color}[${label}]${NC} ${line}"; done) 2>&1 &
     PIDS+=($!)
 }