Area conditions HUD redesign: map-center conditions refresh + boat HUD strip

- Persistent top-of-map HUD strip (SOG/COG/BSP/Depth) replaces instrument grid in bottom sheet
- Bottom sheet now shows area conditions only (Wind/Temp/Baro + wave forecast) — always visible
- loadConditions() fires on every camera idle event so panning the map refreshes conditions
- Crosshair appears at map center while panning; hides when following GPS
- Added tempC field to MarineConditions (already fetched from Open-Meteo hourly)
- InstrumentHandler slimmed to area conditions only; updateDisplay() removed
- LocationService pipes nmeaBoatSpeedData from NmeaStreamManager to companion flow

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 28 insertions, 0 deletions

diff --git a/android-app/app/src/main/res/drawable/ic_crosshair.xml b/android-app/app/src/main/res/drawable/ic_crosshair.xml
new file mode 100644
index 0000000..609538e
--- /dev/null
+++ b/android-app/app/src/main/res/drawable/ic_crosshair.xml
@@ -0,0 +1,28 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="32dp"
+    android:height="32dp"
+    android:viewportWidth="32"
+    android:viewportHeight="32">
+
+    <!-- Horizontal line -->
+    <path
+        android:pathData="M2,16 L13,16 M19,16 L30,16"
+        android:strokeColor="#CCFFFFFF"
+        android:strokeWidth="1.5"
+        android:strokeLineCap="round" />
+
+    <!-- Vertical line -->
+    <path
+        android:pathData="M16,2 L16,13 M16,19 L16,30"
+        android:strokeColor="#CCFFFFFF"
+        android:strokeWidth="1.5"
+        android:strokeLineCap="round" />
+
+    <!-- Center circle -->
+    <path
+        android:pathData="M16,16 m-2.5,0 a2.5,2.5 0 1,0 5,0 a2.5,2.5 0 1,0 -5,0"
+        android:strokeColor="#CCFFFFFF"
+        android:strokeWidth="1.5"
+        android:fillColor="#00000000" />
+
+</vector>