fix: smooth dual-station elevation curve

- Fix cubic Bezier control points (proper Catmull-Rom to Bezier conversion)
- Refine AOS/LOS more robustly by walking from edge into the pass window
- Still 5s sampling for smooth curves

feature/radar/build.gradle.kts

@@ -5,3 +5,7 @@ plugins {
 android {
     namespace = "com.rtbishop.look4sat.feature.radar"
 }
+
+dependencies {
+    implementation(project(":feature:mutual"))
+}