Integrated ISO TP and J1939 frame support

[jdharuman]

📝 Changelog Summary (v0.4.4)

• Unified Protocol Decoding: Intelligent prioritization between J1939 (29-bit) and UDS/ISO-TP (11-bit) with robust Transport Protocol reassembly.
• Enhanced J1939 Support: Auto-labeling for common PGNs (VIN, EEC1) and reassembled multi-frame (BAM/CM) messages.
• Generator Synchronization: Global "Stop" now halts all background cyclic transmissions automatically for safe simulation teardown.
• Responsive State Management: Replaced unstable signal blocking with a "Safe Flag Pattern" to ensure responsive UI editing without data corruption.
• Generator Loopback: Transmitted frames are now visible in the Trace View (TX labels), providing a complete view of bus activity.