Merge main: preserve embedded track detail map, tack detection fixes, 0.12 past track opacity

- Tack detector: STABILITY_MAX=30, START_SKIP_MS=120s cold-start filter (feature branch)
- TrackDetailSheet: embedded Fragment with MapView, back button pops stack (feature branch)
- layout_track_detail_sheet: MapView top half, detail panel bottom half (feature branch)
- MapHandler past track dim opacity: 0.12 (down from 0.22)
- SavedTracksFragment: fragment transaction to TrackDetailSheet + SAF setup (both)
- VoiceLogFragment: inline track list, logViewModel refs fixed (main)

4 files changed, 228 insertions, 161 deletions

diff --git a/android-app/app/src/main/res/layout/fragment_saved_tracks.xml b/android-app/app/src/main/res/layout/fragment_saved_tracks.xml
index 7485e59..a95b368 100644
--- a/android-app/app/src/main/res/layout/fragment_saved_tracks.xml
+++ b/android-app/app/src/main/res/layout/fragment_saved_tracks.xml
@@ -34,15 +34,32 @@
 
     </LinearLayout>
 
-    <TextView
-        android:id="@+id/tv_empty"
+    <LinearLayout
+        android:id="@+id/layout_empty"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
+        android:orientation="vertical"
         android:gravity="center"
-        android:text="No saved tracks yet.\nRecord a trip to see it here."
-        android:textAlignment="center"
-        android:textColor="?attr/colorOnSurfaceVariant"
-        android:visibility="gone" />
+        android:padding="32dp"
+        android:visibility="gone">
+
+        <TextView
+            android:id="@+id/tv_empty"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:text="No saved tracks yet.\nRecord a trip to see it here."
+            android:textAlignment="center"
+            android:textColor="?attr/colorOnSurfaceVariant" />
+
+        <com.google.android.material.button.MaterialButton
+            android:id="@+id/btn_setup_storage"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_marginTop="24dp"
+            android:text="Set up track storage"
+            android:visibility="gone" />
+
+    </LinearLayout>
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/rv_saved_tracks"
diff --git a/android-app/app/src/main/res/layout/fragment_voice_log.xml b/android-app/app/src/main/res/layout/fragment_voice_log.xml
index c1275a6..389add1 100644
--- a/android-app/app/src/main/res/layout/fragment_voice_log.xml
+++ b/android-app/app/src/main/res/layout/fragment_voice_log.xml
@@ -1,156 +1,221 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.core.widget.NestedScrollView
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical"
-    android:padding="20dp">
+    android:layout_height="match_parent">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Log Entry"
-        android:textAppearance="?attr/textAppearanceHeadlineSmall"
-        android:layout_marginBottom="16dp" />
-
-    <!-- Note text — voice fills this; user can also type directly -->
-    <com.google.android.material.textfield.TextInputLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="12dp"
-        style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
-
-        <com.google.android.material.textfield.TextInputEditText
-            android:id="@+id/et_note"
-            android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:minLines="3"
-            android:maxLines="6"
-            android:gravity="top"
-            android:hint="Tap mic or type a note…"
-            android:inputType="textMultiLine|textCapSentences"
-            android:scrollbars="vertical" />
-
-    </com.google.android.material.textfield.TextInputLayout>
-
-    <!-- Action row: mic, camera, gallery, status -->
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:gravity="center_vertical"
-        android:layout_marginBottom="12dp">
-
-        <com.google.android.material.floatingactionbutton.FloatingActionButton
-            android:id="@+id/fab_mic"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            app:fabSize="mini"
-            android:src="@android:drawable/ic_btn_speak_now"
-            android:contentDescription="Start voice recognition"
-            android:layout_marginEnd="12dp" />
+        android:orientation="vertical"
+        android:padding="20dp">
 
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/btn_camera"
-            style="@style/Widget.Material3.Button.IconButton.Outlined"
-            android:layout_width="wrap_content"
+        <!-- ── Log entry section — visible only while recording ── -->
+        <LinearLayout
+            android:id="@+id/layout_log_entry"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:contentDescription="Take photo"
-            app:icon="@android:drawable/ic_menu_camera"
-            android:layout_marginEnd="8dp" />
-
+            android:orientation="vertical"
+            android:visibility="gone">
+
+            <TextView
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="Log Entry"
+                android:textAppearance="?attr/textAppearanceHeadlineSmall"
+                android:layout_marginBottom="16dp" />
+
+            <com.google.android.material.textfield.TextInputLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="12dp"
+                style="@style/Widget.Material3.TextInputLayout.OutlinedBox">
+
+                <com.google.android.material.textfield.TextInputEditText
+                    android:id="@+id/et_note"
+                    android:layout_width="match_parent"
+                    android:layout_height="wrap_content"
+                    android:minLines="3"
+                    android:maxLines="6"
+                    android:gravity="top"
+                    android:hint="Tap mic or type a note…"
+                    android:inputType="textMultiLine|textCapSentences"
+                    android:scrollbars="vertical" />
+
+            </com.google.android.material.textfield.TextInputLayout>
+
+            <!-- Action row: mic, camera, gallery, status -->
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:layout_marginBottom="12dp">
+
+                <com.google.android.material.floatingactionbutton.FloatingActionButton
+                    android:id="@+id/fab_mic"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    app:fabSize="mini"
+                    android:src="@android:drawable/ic_btn_speak_now"
+                    android:contentDescription="Start voice recognition"
+                    android:layout_marginEnd="12dp" />
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btn_camera"
+                    style="@style/Widget.Material3.Button.IconButton.Outlined"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:contentDescription="Take photo"
+                    app:icon="@android:drawable/ic_menu_camera"
+                    android:layout_marginEnd="8dp" />
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btn_gallery"
+                    style="@style/Widget.Material3.Button.IconButton.Outlined"
+                    android:layout_width="wrap_content"
+                    android:layout_height="wrap_content"
+                    android:contentDescription="Attach photo from gallery"
+                    app:icon="@android:drawable/ic_menu_gallery"
+                    android:layout_marginEnd="12dp" />
+
+                <TextView
+                    android:id="@+id/tv_status"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:text=""
+                    android:textSize="14sp"
+                    android:textColor="?attr/colorOnSurfaceVariant" />
+
+            </LinearLayout>
+
+            <!-- Photo thumbnail — hidden until a photo is attached -->
+            <FrameLayout
+                android:id="@+id/frame_photo"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginBottom="12dp"
+                android:visibility="gone">
+
+                <ImageView
+                    android:id="@+id/iv_photo"
+                    android:layout_width="120dp"
+                    android:layout_height="90dp"
+                    android:scaleType="centerCrop"
+                    android:contentDescription="Attached photo" />
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btn_remove_photo"
+                    style="@style/Widget.Material3.Button.IconButton"
+                    android:layout_width="32dp"
+                    android:layout_height="32dp"
+                    android:layout_gravity="top|end"
+                    android:contentDescription="Remove photo"
+                    app:icon="@drawable/ic_close" />
+
+            </FrameLayout>
+
+            <!-- Save / Clear row -->
+            <LinearLayout
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:orientation="horizontal"
+                android:gravity="center_vertical"
+                android:layout_marginBottom="12dp">
+
+                <com.google.android.material.button.MaterialButton
+                    android:id="@+id/btn_save"
+                    android:layout_width="0dp"
+                    android:layout_height="wrap_content"
+                    android:layout_weight="1"
+                    android:text="Save"
+                    android:layout_marginEnd="8dp" />
+
+                <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" />
+
+            </LinearLayout>
+
+            <TextView
+                android:id="@+id/tv_saved_confirmation"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:text=""
+                android:textSize="14sp"
+                android:textColor="?attr/colorPrimary"
+                android:layout_marginBottom="20dp" />
+
+            <View
+                android:layout_width="match_parent"
+                android:layout_height="1dp"
+                android:background="?attr/colorOutline"
+                android:layout_marginBottom="20dp" />
+
+        </LinearLayout>
+        <!-- end layout_log_entry -->
+
+        <!-- Generate Trip Report — always accessible -->
         <com.google.android.material.button.MaterialButton
-            android:id="@+id/btn_gallery"
-            style="@style/Widget.Material3.Button.IconButton.Outlined"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:contentDescription="Attach photo from gallery"
-            app:icon="@android:drawable/ic_menu_gallery"
-            android:layout_marginEnd="12dp" />
+            android:id="@+id/btn_generate_report"
+            style="@style/Widget.Material3.Button.TonalButton"
+            android:layout_width="match_parent"
+            android:layout_height="60dp"
+            android:text="GENERATE TRIP REPORT"
+            android:layout_marginBottom="24dp" />
 
+        <!-- ── Trips section ── -->
         <TextView
-            android:id="@+id/tv_status"
-            android:layout_width="0dp"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text=""
-            android:textSize="14sp"
-            android:textColor="?attr/colorOnSurfaceVariant" />
-
-    </LinearLayout>
-
-    <!-- Photo thumbnail — hidden until a photo is attached -->
-    <FrameLayout
-        android:id="@+id/frame_photo"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_marginBottom="12dp"
-        android:visibility="gone">
-
-        <ImageView
-            android:id="@+id/iv_photo"
-            android:layout_width="120dp"
-            android:layout_height="90dp"
-            android:scaleType="centerCrop"
-            android:contentDescription="Attached photo" />
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/btn_remove_photo"
-            style="@style/Widget.Material3.Button.IconButton"
-            android:layout_width="32dp"
-            android:layout_height="32dp"
-            android:layout_gravity="top|end"
-            android:contentDescription="Remove photo"
-            app:icon="@drawable/ic_close" />
-
-    </FrameLayout>
-
-    <!-- Save / Clear row -->
-    <LinearLayout
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:orientation="horizontal"
-        android:gravity="center_vertical"
-        android:layout_marginBottom="12dp">
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/btn_save"
-            android:layout_width="0dp"
+            android:text="Trips"
+            android:textSize="13sp"
+            android:textAllCaps="true"
+            android:letterSpacing="0.08"
+            android:textColor="?attr/colorOnSurfaceVariant"
+            android:layout_marginBottom="8dp" />
+
+        <!-- Empty state -->
+        <LinearLayout
+            android:id="@+id/layout_empty"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:layout_weight="1"
-            android:text="Save"
-            android:layout_marginEnd="8dp" />
-
-        <com.google.android.material.button.MaterialButton
-            android:id="@+id/btn_clear"
-            style="@style/Widget.Material3.Button.TextButton"
-            android:layout_width="wrap_content"
+            android:orientation="vertical"
+            android:gravity="center_horizontal"
+            android:paddingVertical="24dp"
+            android:visibility="gone">
+
+            <TextView
+                android:id="@+id/tv_empty"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:text="No saved tracks yet.\nRecord a trip to see it here."
+                android:textAlignment="center"
+                android:textColor="?attr/colorOnSurfaceVariant" />
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/btn_setup_storage"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginTop="16dp"
+                android:text="Set up track storage"
+                android:visibility="gone" />
+
+        </LinearLayout>
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/rv_saved_tracks"
+            android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            android:text="Clear" />
+            android:nestedScrollingEnabled="false"
+            android:clipToPadding="false"
+            android:paddingBottom="80dp" />
 
     </LinearLayout>
 
-    <!-- Saved confirmation -->
-    <TextView
-        android:id="@+id/tv_saved_confirmation"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:text=""
-        android:textSize="14sp"
-        android:textColor="?attr/colorPrimary"
-        android:layout_marginBottom="24dp" />
-
-    <View
-        android:layout_width="match_parent"
-        android:layout_height="1dp"
-        android:background="?attr/colorOutline"
-        android:layout_marginBottom="24dp" />
-
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/btn_generate_report"
-        style="@style/Widget.Material3.Button.TonalButton"
-        android:layout_width="match_parent"
-        android:layout_height="60dp"
-        android:text="GENERATE TRIP REPORT" />
-
-</LinearLayout>
+</androidx.core.widget.NestedScrollView>
diff --git a/android-app/app/src/main/res/layout/layout_instruments_sheet.xml b/android-app/app/src/main/res/layout/layout_instruments_sheet.xml
index f8dc365..5e58009 100644
--- a/android-app/app/src/main/res/layout/layout_instruments_sheet.xml
+++ b/android-app/app/src/main/res/layout/layout_instruments_sheet.xml
@@ -183,8 +183,7 @@
         android:layout_marginEnd="-16dp"
         app:layout_constraintTop_toBottomOf="@id/wave_divider"
         app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent">
+        app:layout_constraintEnd_toEndOf="parent">
 
         <!-- Current -->
         <LinearLayout
@@ -339,19 +338,5 @@
 
     </LinearLayout>
 
-    <!-- Saved Tracks button -->
-    <com.google.android.material.button.MaterialButton
-        android:id="@+id/btn_saved_tracks"
-        style="@style/Widget.Material3.Button.OutlinedButton"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        android:layout_marginHorizontal="16dp"
-        android:layout_marginTop="12dp"
-        android:layout_marginBottom="8dp"
-        android:text="Saved Tracks"
-        android:textAllCaps="false"
-        app:layout_constraintTop_toBottomOf="@id/forecast_row"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintEnd_toEndOf="parent" />
 
 </androidx.constraintlayout.widget.ConstraintLayout>
diff --git a/android-app/app/src/main/res/values/colors.xml b/android-app/app/src/main/res/values/colors.xml
index 2df4109..c3b115c 100755
--- a/android-app/app/src/main/res/values/colors.xml
+++ b/android-app/app/src/main/res/values/colors.xml
@@ -52,7 +52,7 @@
     <color name="wave_sky_top">#2B8FC4</color>
     <color name="wave_sky_bottom">#87C8DF</color>
     <color name="wave_sea_top">#0D7A9A</color>
-    <color name="wave_sea_bottom">#074B68</color>
+    <color name="wave_sea_bottom">#0D2137</color>
     <color name="wave_shimmer">#50FFFFFF</color>
     <color name="wave_whitecap">#80FFFFFF</color>