Phase 1: foundation modules

Central Config with all tunables (retention, GPS timeout, colors,
event type keys, menu item metadata). Event / EventStore handle
persistence via Application.Storage with 7-day pruning. Logger
mirrors the same retention. LayoutMetrics and Haversine provide
resolution-independent geometry helpers. German UI strings and
placeholder menu icons landed alongside so the build stays green.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

source/Event.mc

@@ -0,0 +1,41 @@
+import Toybox.Lang;
+
+// Value object for a protocol entry. Serialized as a plain Dictionary
+// so Application.Storage can persist it.
+class Event {
+    public var type as String;
+    public var timestamp as Number;   // unix seconds
+    public var lat as Float or Null;
+    public var lon as Float or Null;
+    public var accuracy as Float or Null;
+
+    function initialize(type as String, timestamp as Number,
+                        lat as Float or Null, lon as Float or Null,
+                        accuracy as Float or Null) {
+        self.type = type;
+        self.timestamp = timestamp;
+        self.lat = lat;
+        self.lon = lon;
+        self.accuracy = accuracy;
+    }
+
+    function toDict() as Dictionary {
+        return {
+            "t"   => type,
+            "ts"  => timestamp,
+            "lat" => lat,
+            "lon" => lon,
+            "acc" => accuracy
+        };
+    }
+
+    static function fromDict(d as Dictionary) as Event {
+        return new Event(
+            d["t"] as String,
+            d["ts"] as Number,
+            d["lat"] as Float or Null,
+            d["lon"] as Float or Null,
+            d["acc"] as Float or Null
+        );
+    }
+}