fix(ui): remove night mode FAB, fix fishing FAB occlusion, cap Ocean tiles at zoom 13

- Remove fab_night_mode from layout and all MainActivity code (nightModePrefs,
  isNightMode, fabNightMode field, onCreate theme apply, click handler, applyScreenBrightness)
- Raise fab_fishing marginBottom 80dp→136dp so it clears the instrument sheet peek (120dp)
- Set maxZoom=13 on Esri Ocean Base TileSet; tiles stop at z13, MapLibre overzooms
  rather than fetching blank 404 tiles at higher zoom levels

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

3 files changed, 2 insertions, 35 deletions

diff --git a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
index 93cefb1..dd14557 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/MainActivity.kt
@@ -63,11 +63,6 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
 
     private val featureFlags get() = (application as NavApplication).featureFlags
 
-    private val nightModePrefs by lazy { getSharedPreferences("night_mode", MODE_PRIVATE) }
-    private var isNightMode: Boolean
-        get() = nightModePrefs.getBoolean("enabled", false)
-        set(v) { nightModePrefs.edit().putBoolean("enabled", v).apply() }
-
     private var mapView: MapView? = null
     private var mobHandler: MobHandler? = null
     private var instrumentHandler: InstrumentHandler? = null
@@ -87,7 +82,6 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
     private lateinit var fragmentContainer: FrameLayout
     private lateinit var fabRecordTrack: FloatingActionButton
     private lateinit var fabLayers: FloatingActionButton
-    private lateinit var fabNightMode: FloatingActionButton
     private lateinit var fabRecenter: MaterialButton
     private lateinit var bottomSheet: CardView
     private lateinit var bottomNav: BottomNavigationView
@@ -167,7 +161,6 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
     }
 
     override fun onCreate(savedInstanceState: Bundle?) {
-        if (isNightMode) setTheme(R.style.Theme_Nav_NightVision)
         super.onCreate(savedInstanceState)
         MapLibre.getInstance(this)
         setContentView(R.layout.activity_main)
@@ -234,17 +227,10 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
         fragmentContainer = findViewById(R.id.fragment_container)
         fabRecordTrack = findViewById(R.id.fab_record_track)
         fabLayers = findViewById(R.id.fab_layers)
-        fabNightMode = findViewById(R.id.fab_night_mode)
         fabRecenter = findViewById(R.id.fab_recenter)
         fabLayers.setOnClickListener {
             buildLayerPickerSheet().show(supportFragmentManager, "layer_picker")
         }
-        fabNightMode.setOnClickListener {
-            isNightMode = !isNightMode
-            applyScreenBrightness()
-            recreate()
-        }
-        applyScreenBrightness()
         bottomSheet = findViewById(R.id.instrument_bottom_sheet)
         bottomNav = findViewById(R.id.bottom_navigation)
         mapCrosshair = findViewById(R.id.map_crosshair)
@@ -352,12 +338,6 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
 
     }
 
-    /** Updates all static unit label TextViews to match current [unitPrefs]. */
-    private fun applyScreenBrightness() {
-        val lp = window.attributes
-        lp.screenBrightness = if (isNightMode) 0.3f else WindowManager.LayoutParams.BRIGHTNESS_OVERRIDE_NONE
-        window.attributes = lp
-    }
 
     private fun applyUnitLabels() {
         unitHudSog.text   = unitPrefs.speedUnitLabel()
diff --git a/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt b/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
index 5902da1..b8b7ac8 100644
--- a/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
+++ b/android-app/app/src/main/kotlin/org/terst/nav/ui/MapLayerManager.kt
@@ -109,7 +109,7 @@ class MapLayerManager(context: Context) {
     fun addToStyleBuilder(builder: Style.Builder) {
         // ── Sources ───────────────────────────────────────────────────────────
         builder.withSource(RasterSource(SOURCE_OCEAN,
-            TileSet("2.2.0", URL_OCEAN), 256))
+            TileSet("2.2.0", URL_OCEAN).also { it.setMaxZoom(13f) }, 256))
 
         builder.withSource(RasterSource(SOURCE_SATELLITE,
             TileSet("2.2.0", URL_SATELLITE), 256))
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 1a54722..a1939c1 100644
--- a/android-app/app/src/main/res/layout/activity_main.xml
+++ b/android-app/app/src/main/res/layout/activity_main.xml
@@ -64,19 +64,6 @@
                 app:layout_constraintTop_toBottomOf="@id/nav_hud"
                 app:layout_constraintStart_toStartOf="parent" />
 
-            <!-- Night mode toggle FAB -->
-            <com.google.android.material.floatingactionbutton.FloatingActionButton
-                android:id="@+id/fab_night_mode"
-                android:layout_width="wrap_content"
-                android:layout_height="wrap_content"
-                android:layout_marginTop="4dp"
-                android:layout_marginEnd="12dp"
-                android:contentDescription="Toggle night mode"
-                app:srcCompat="@drawable/ic_night_mode"
-                app:fabSize="mini"
-                app:elevation="8dp"
-                app:layout_constraintTop_toBottomOf="@id/fab_layers"
-                app:layout_constraintEnd_toEndOf="parent" />
 
             <!-- Crosshair — visible when not following (panning) -->
             <ImageView
@@ -119,7 +106,7 @@
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="16dp"
-                android:layout_marginBottom="80dp"
+                android:layout_marginBottom="136dp"
                 android:src="@drawable/ic_fish"
                 android:contentDescription="Fishing mode"
                 app:fabSize="mini"