- TagInfo now includes nfc_card_id: the 10-digit decimal ID standard NFC readers display
- Calculated from bytes 3-6 of the 7-byte UID as big-endian uint32
- Example: UID 042B603A9A4080 -> nfc_card_id 983187584
- Updated standalone test to display nfc_card_id
- Version bump to 1.4.0
- Removed automatic green flash + cyan color on tag insert
- Callbacks now fully control LED behavior
- Added software_flash() for reliable cross-portal flashing
- Added software_pulse() for breathing effect
- Added apply_effect() unified interface
- Effects run in background threads (non-blocking)
- Tag removal stops any running effects on that pad
- Added legacy_key field to TagInfo for config lookup
- Add per-pad stop event system (_flash_stop_events dictionary)
- Add stop_flash(pad) method to cancel active flash animations
- flash_pad now checks stop events at multiple points in loop
- Tag removal handler calls stop_flash before setting pad to OFF
- Fixes issue where LED flash continued indefinitely after figure removed
