merge: reconcile master particle-wind work with origin/main redesign

Merged divergent branches (common ancestor a9d87b6). Took origin/main
as base (layer manager, recenter, quit button, GPX tracks, marine
conditions, dark theme, user position layer, active/past track layers)
and layered in particle wind simulation work:

- MapHandler: added setupWindLayer, updateWindLayer, updateWindGridLayer;
  kept their user-pos layer, follow/recenter state, active+past tracks
- WeatherRepository: kept their fetchCurrentConditions, added fetchWindGrid
- MainViewModel: kept their track/marine/summary changes, added windGrid
  StateFlow, loadWindGrid, buildGrid
- MainActivity: kept their full UI (layer picker, quit, recenter, fade
  animations), added particleWindView wiring, weatherLoaded guard,
  windArrow/windGrid observers
- activity_main.xml: took their LinearLayout redesign, added ParticleWindView
  overlay inside ConstraintLayout

https://claude.ai/code/session_01HXPjBsogsJVRwCiekDGkJX

1 files changed, 108 insertions, 66 deletions

diff --git a/android-app/app/src/main/res/layout/activity_main.xml b/android-app/app/src/main/res/layout/activity_main.xml
index feeb43d..1741c62 100644
--- a/android-app/app/src/main/res/layout/activity_main.xml
+++ b/android-app/app/src/main/res/layout/activity_main.xml
@@ -1,91 +1,133 @@
 <?xml version="1.0" encoding="utf-8"?>
-<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     tools:context=".MainActivity">
 
-    <!-- Main Content Area -->
-    <androidx.constraintlayout.widget.ConstraintLayout
+    <androidx.coordinatorlayout.widget.CoordinatorLayout
         android:layout_width="match_parent"
-        android:layout_height="match_parent"
-        android:layout_marginBottom="56dp"> <!-- Space for BottomNav -->
+        android:layout_height="0dp"
+        android:layout_weight="1">
 
-        <org.maplibre.android.maps.MapView
-            android:id="@+id/mapView"
+        <!-- Main Content Area -->
+        <androidx.constraintlayout.widget.ConstraintLayout
             android:layout_width="match_parent"
-            android:layout_height="match_parent" />
+            android:layout_height="match_parent">
 
-        <org.terst.nav.ui.map.ParticleWindView
-            android:id="@+id/particle_wind_view"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:clickable="false"
-            android:focusable="false" />
+            <org.maplibre.android.maps.MapView
+                android:id="@+id/mapView"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent" />
 
-        <!-- Overlay Fragment Container (for Log, Safety, Help) -->
-        <FrameLayout
-            android:id="@+id/fragment_container"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:visibility="gone"
-            android:background="?attr/colorSurface" />
+            <org.terst.nav.ui.map.ParticleWindView
+                android:id="@+id/particle_wind_view"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:clickable="false"
+                android:focusable="false" />
 
-    </androidx.constraintlayout.widget.ConstraintLayout>
+            <!-- Overlay Fragment Container (for Log, Safety, Help) -->
+            <FrameLayout
+                android:id="@+id/fragment_container"
+                android:layout_width="match_parent"
+                android:layout_height="match_parent"
+                android:visibility="gone"
+                android:background="?attr/colorSurface" />
 
-    <!-- Collapsible Instrument Bottom Sheet -->
-    <androidx.cardview.widget.CardView
-        android:id="@+id/instrument_bottom_sheet"
-        android:layout_width="match_parent"
-        android:layout_height="wrap_content"
-        app:behavior_hideable="false"
-        app:behavior_peekHeight="120dp"
-        app:cardElevation="16dp"
-        app:cardCornerRadius="24dp"
-        app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
-
-        <include
-            layout="@layout/layout_instruments_sheet"
+            <!-- Quit button — stops all services and exits -->
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/btn_quit"
+                style="@style/Widget.Material3.Button.IconButton.Filled.Tonal"
+                android:layout_width="40dp"
+                android:layout_height="40dp"
+                android:alpha="0.7"
+                app:icon="@drawable/ic_close"
+                app:iconSize="18dp"
+                app:iconGravity="textStart"
+                app:iconPadding="0dp"
+                app:cornerRadius="20dp"
+                app:elevation="4dp"
+                app:layout_constraintTop_toTopOf="parent"
+                app:layout_constraintEnd_toEndOf="parent"
+                android:layout_marginTop="16dp"
+                android:layout_marginEnd="16dp" />
+
+            <com.google.android.material.button.MaterialButton
+                android:id="@+id/fab_recenter"
+                android:layout_width="wrap_content"
+                android:layout_height="40dp"
+                android:text="⊙ Recenter"
+                android:textSize="13sp"
+                android:paddingStart="20dp"
+                android:paddingEnd="20dp"
+                android:visibility="gone"
+                app:cornerRadius="20dp"
+                app:elevation="20dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintEnd_toEndOf="parent"
+                app:layout_constraintStart_toStartOf="parent"
+                android:layout_marginBottom="24dp" />
+
+        </androidx.constraintlayout.widget.ConstraintLayout>
+
+        <!-- Collapsible Instrument Bottom Sheet -->
+        <androidx.cardview.widget.CardView
+            android:id="@+id/instrument_bottom_sheet"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content" />
+            android:layout_height="wrap_content"
+            app:behavior_hideable="false"
+            app:behavior_peekHeight="120dp"
+            app:cardElevation="16dp"
+            app:cardCornerRadius="24dp"
+            app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior">
 
-    </androidx.cardview.widget.CardView>
+            <include
+                layout="@layout/layout_instruments_sheet"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content" />
+
+        </androidx.cardview.widget.CardView>
+
+        <!-- Persistent MOB Button (Crucial for safety, always on top) -->
+        <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/fab_mob"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            android:clickable="true"
+            android:focusable="true"
+            android:contentDescription="Man Overboard"
+            app:srcCompat="@android:drawable/ic_dialog_alert"
+            app:backgroundTint="@color/mob_button_background"
+            app:elevation="20dp"
+            app:layout_anchor="@id/instrument_bottom_sheet"
+            app:layout_anchorGravity="top|start" />
+
+        <!-- Record Track Button -->
+        <com.google.android.material.floatingactionbutton.FloatingActionButton
+            android:id="@+id/fab_record_track"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_margin="16dp"
+            android:clickable="true"
+            android:focusable="true"
+            android:contentDescription="Record Track"
+            app:srcCompat="@drawable/ic_track_record"
+            app:elevation="20dp"
+            app:layout_anchor="@id/instrument_bottom_sheet"
+            app:layout_anchorGravity="top|end" />
+
+    </androidx.coordinatorlayout.widget.CoordinatorLayout>
 
     <!-- Bottom Navigation -->
     <com.google.android.material.bottomnavigation.BottomNavigationView
         android:id="@+id/bottom_navigation"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:layout_gravity="bottom"
         android:background="?attr/colorSurface"
         app:menu="@menu/bottom_nav_menu" />
 
-    <!-- Persistent MOB Button (Crucial for safety, always on top) -->
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/fab_mob"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_margin="16dp"
-        android:clickable="true"
-        android:focusable="true"
-        android:contentDescription="Man Overboard"
-        app:srcCompat="@android:drawable/ic_dialog_alert"
-        app:backgroundTint="@color/mob_button_background"
-        app:layout_anchor="@id/instrument_bottom_sheet"
-        app:layout_anchorGravity="top|start" />
-
-    <!-- Record Track Button -->
-    <com.google.android.material.floatingactionbutton.FloatingActionButton
-        android:id="@+id/fab_record_track"
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:layout_margin="16dp"
-        android:clickable="true"
-        android:focusable="true"
-        android:contentDescription="Record Track"
-        app:srcCompat="@drawable/ic_track_record"
-        app:layout_anchor="@id/instrument_bottom_sheet"
-        app:layout_anchorGravity="top|end" />
-
-</androidx.coordinatorlayout.widget.CoordinatorLayout>
+</LinearLayout>