-Add scanStudentBadge method using flutter_nfc_kit

- Map NFC Tag ID to 'Student.leoId' and use placeholders for missing name data (to be resolved by backend).

- Integrate with existing pushStudentQueue to support offline mode.

- Ensure NFC session cleanup with finish() in finally block to prevent hardware locking.

- Add flutter_nfc_kit (v3.6.1) dependency
- Update Android minSdk to 26 (required by nfc_kit)
- Add NFC permissions and hardware feature in AndroidManifest

add basic theme Light/Dark changing from device.

See merge request !6

Dev anton better qr code scanner

See merge request !4

Code review & refactoring + Documentation.

See merge request !3

Add a "download to CSV" button in case of network/communication loss with remote google sheet file.

Closes #6

See merge request !2

MVP: This is the first somewhat complete version of the project.

Closes #1

See merge request !1

Instead of searching for the next available empty column (which creates an infinite list of timestamps), the script now targets Column 7 (Column G) specifically. It will overwrite this cell every time a student scans their card after the initial entry

implemented batch syncs with google sheets through our service, updated the UI to match the application state and give real time feedback.