feat(ui): wire redesigned instrument sheet — InstrumentHandler rewrite + MainActivity

InstrumentHandler: direction arrows (SKY/OCEAN palettes), WaveView state,
metres→feet conversion, bearing formatting, all helpers top-level for TDD.

MainActivity: setupHandlers wires all new view refs; observeDataSources
passes cogBearingDeg, twsBearingDeg, raw metres to handler; depth collector
wired from nmeaDepthDataFlow.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 39 insertions, 0 deletions

diff --git a/android-app/app/src/test/kotlin/org/terst/nav/ui/InstrumentHandlerTest.kt b/android-app/app/src/test/kotlin/org/terst/nav/ui/InstrumentHandlerTest.kt
new file mode 100644
index 0000000..a749ba2
--- /dev/null
+++ b/android-app/app/src/test/kotlin/org/terst/nav/ui/InstrumentHandlerTest.kt
@@ -0,0 +1,39 @@
+package org.terst.nav.ui
+
+import org.junit.Assert.assertEquals
+import org.junit.Test
+import java.util.Locale
+
+class InstrumentHandlerTest {
+
+    @Test
+    fun `metresToFeet converts correctly`() {
+        assertEquals(3.28f, metresToFeet(1.0).toFloat(), 0.01f)
+    }
+
+    @Test
+    fun `metresToFeet zero returns zero`() {
+        assertEquals(0f, metresToFeet(0.0).toFloat(), 0.001f)
+    }
+
+    @Test
+    fun `formatFt formats to one decimal`() {
+        val result = formatFt(3.28084, Locale.US)
+        assertEquals("3.3", result)
+    }
+
+    @Test
+    fun `formatBearing appends degree symbol`() {
+        assertEquals("275°", formatBearing(275.0, Locale.US))
+    }
+
+    @Test
+    fun `formatBearing rounds to zero decimals`() {
+        assertEquals("123°", formatBearing(123.4, Locale.US))
+    }
+
+    @Test
+    fun `formatPeriod appends s`() {
+        assertEquals("· 14s", formatPeriod(14.0, Locale.US))
+    }
+}