Added try-catch blocks and null checks to event handlers in core nodes
to prevent uncaught exceptions from crashing the Node-RED runtime.

Changes per node:

**TCP (31-tcpin.js)**
- Wrapped all `on('data')` handlers in try-catch (TcpIn client/server, TcpGet)

**UDP (32-udp.js)**
- Wrapped `on('message')` handler in try-catch

**Exec (90-exec.js)**
- Wrapped stdout/stderr `on('data')` handlers in try-catch

**WebSocket (22-websocket.js)**
- Wrapped send() loop in handleEvent() with try-catch

**MQTT (10-mqtt.js)**
- Added null check for packet parameter in subscriptionHandler()
- Wrapped subscription handler callback in try-catch
- Added null check for mpacket.properties

Without these protections, malformed data or unexpected errors in async
event handlers could cause uncaught exceptions that crash the entire
Node-RED process.

Check indexOf result before splicing to prevent removing wrong element
when clearDelayList() runs between timeout registration and execution.

If indexOf returns -1 (id already removed), splice(-1, 1) would incorrectly
remove the last element. Now we skip the splice if id is not found.

Fixes: Dennis-SEG#3

… close

…aught-exceptions

fix: prevent uncaught exceptions in core node event handlers

fix: prevent incorrect array modification in delay node

fix: prevent double resolve in node close callback

…dition-clean

fix: prevent race condition in localfilesystem context store during shutdown

…subpath

registry: fix importModule base dir for exports subpaths

Revert overflow fix in editableList

Bump for 4.1.4 release