refactored heavily

lru_store.py

@@ -0,0 +1,33 @@
+# ---------------------------------------------------------------------------
+# LRU-Speicher (persistent via QSettings)
+# ---------------------------------------------------------------------------
+from PyQt5.QtCore import QSettings
+
+
+class LruStore:
+    """Speichert bis zu max_size TCP-Verbindungen persistent (host:port)."""
+
+    def __init__(self, max_size: int = 5):
+        self._max = max_size
+        self._cfg = QSettings("gnss_skyplot", "connections")
+
+    def entries(self) -> list[str]:
+        val = self._cfg.value("tcp_lru", [])
+        if isinstance(val, str):
+            val = [val]
+        return val or []
+
+    def add(self, host: str, port: int) -> None:
+        entry   = f"{host}:{port}"
+        entries = [e for e in self.entries() if e != entry]
+        entries.insert(0, entry)
+        self._cfg.setValue("tcp_lru", entries[: self._max])
+        self._cfg.sync()
+
+    def clear(self) -> None:
+        self._cfg.remove("tcp_lru")
+        self._cfg.sync()
+
+    def parse(self, entry: str) -> tuple[str, int]:
+        host, port_str = entry.rsplit(":", 1)
+        return host.strip(), int(port_str.strip())