Add Pi Zero headless serial bridge with AP portal and daily RTC-based logs

src/app_state.py

@@ -0,0 +1,37 @@
+from dataclasses import dataclass, field
+from threading import Lock
+from typing import Dict, List
+
+
+@dataclass
+class AppState:
+    ap_mode: bool = False
+    wifi_connected: bool = False
+    internet_available: bool = False
+    connecting: bool = False
+    status_message: str = "Startup"
+    last_error: str = ""
+    known_ssids: List[str] = field(default_factory=list)
+    ap_grace_until: float = 0.0
+    lock: Lock = field(default_factory=Lock, repr=False)
+
+    def update_status(self, message: str, error: str = "") -> None:
+        with self.lock:
+            self.status_message = message
+            self.last_error = error
+
+    def set_known_ssids(self, ssids: List[str]) -> None:
+        with self.lock:
+            self.known_ssids = ssids
+
+    def snapshot(self) -> Dict[str, object]:
+        with self.lock:
+            return {
+                "ap_mode": self.ap_mode,
+                "wifi_connected": self.wifi_connected,
+                "internet_available": self.internet_available,
+                "connecting": self.connecting,
+                "status_message": self.status_message,
+                "last_error": self.last_error,
+                "known_ssids": list(self.known_ssids),
+            }