Add hidden dev log (long-press drag handle)

NavLogger is a 200-entry in-memory ring buffer with format:
  HH:mm:ss.SSS LEVEL tag: message

Entries are written at:
- App start
- First GPS fix (lat/lon/sog/cog)
- fetchCurrentConditions: request params + full success summary
  (wind, temp, waves, swell, current) or exception class+message
- fetchForecastItems: request params + item count or error

DevLogSheet (BottomSheetDialogFragment) shows the log in a
monospace ScrollView with Copy and Clear buttons. Trigger: long-press
the drag handle bar on the instrument bottom sheet.

Primary use: copy the log and paste it to Claude to diagnose
conditions API failures without needing adb.

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 74 insertions, 0 deletions

diff --git a/android-app/app/src/main/res/layout/sheet_dev_log.xml b/android-app/app/src/main/res/layout/sheet_dev_log.xml
new file mode 100644
index 0000000..5464242
--- /dev/null
+++ b/android-app/app/src/main/res/layout/sheet_dev_log.xml
@@ -0,0 +1,74 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="?attr/colorSurface">
+
+    <!-- Header: title + action buttons -->
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:paddingStart="16dp"
+        android:paddingEnd="8dp"
+        android:paddingTop="16dp"
+        android:paddingBottom="8dp"
+        android:gravity="center_vertical">
+
+        <TextView
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:text="Dev Log"
+            android:textSize="16sp"
+            android:textStyle="bold"
+            android:textColor="?attr/colorOnSurface" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btn_clear"
+            style="@style/Widget.Material3.Button.TextButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Clear"
+            android:textColor="?attr/colorOnSurfaceVariant" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btn_copy"
+            style="@style/Widget.Material3.Button.TextButton"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="Copy" />
+
+    </LinearLayout>
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:background="?attr/colorOutline"
+        android:alpha="0.3" />
+
+    <ScrollView
+        android:id="@+id/scroll_view"
+        android:layout_width="match_parent"
+        android:layout_height="0dp"
+        android:layout_weight="1"
+        android:paddingStart="12dp"
+        android:paddingEnd="12dp"
+        android:paddingTop="10dp"
+        android:paddingBottom="24dp"
+        android:clipToPadding="false">
+
+        <TextView
+            android:id="@+id/log_text"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"
+            android:fontFamily="monospace"
+            android:textSize="11sp"
+            android:textColor="?attr/colorOnSurface"
+            android:lineSpacingMultiplier="1.35"
+            android:textIsSelectable="true" />
+
+    </ScrollView>
+
+</LinearLayout>