Rotary interface

// crates/sentinel-display/src/lib.rs
// Embedded firmware module for ESP32-S3 Rotary Display human-machine interface.

#![no_std]

pub struct RotaryDisplayInterface {
    brightness: u8,
    active_node_state: bool,
}

impl RotaryDisplayInterface {
    pub fn new() -> Self {
        Self {
            brightness: 80,
            active_node_state: true,
        }
    }

    pub fn handle_rotation(&mut self, delta: i8) {
        let new_brightness = (self.brightness as i16) + (delta as i16) * 5;
        self.brightness = new_brightness.clamp(10, 100) as u8;
    }

    pub fn render_status_screen(&self) -> &'static str {
        if self.active_node_state {
            "[DISPLAY] STATUS: SECURE // SOVEREIGN MESH ONLINE"
        } else {
            "[DISPLAY] STATUS: AIR-GAP ISOLATED // STANDBY"
        }
    }
}