Fix PN532 transport and NFC tag handling.

Tighten PN532 framing and NFC access locking so scan, read, write, and raw operations behave reliably on hardware, and correct Classic versus Type 2 tag classification so common cards hit the right code paths. Refresh the embedded web assets and launcher files to match the corrected firmware behavior.

Made-with: Cursor

README.md

@@ -67,6 +67,26 @@ On init the PN532 is configured for **high passive-activation retries** (`RFConf
 
 ## Build
 
+### One-command local run
+
+```bash
+./start-firmware.sh
+```
+
+What it does:
+
+- bootstraps ESP-IDF locally if needed
+- builds the web UI into `firmware/data`
+- configures target `esp32s3`
+- auto-detects the serial port
+- builds and flashes the device
+
+Useful options:
+
+- `./start-firmware.sh --build-only`
+- `./start-firmware.sh --monitor`
+- `./start-firmware.sh --port /dev/cu.usbmodemXXXX`
+
 ### Web UI → flash image
 
 ```bash