feat(fishing): wire fishing mode FAB and overlay in MainActivity

Adds FishingOverlayView + fab_fishing to layout, initializes FishingModeManager,
and wires FAB click to toggle fishing mode with SST layer and target overlay.

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

2 files changed, 69 insertions, 0 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 cfc8d6d..4b090e7 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
@@ -91,6 +91,10 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
     private lateinit var bottomNav: BottomNavigationView
     private lateinit var mapCrosshair: View
     private lateinit var inclinometerView: org.terst.nav.ui.InclinometerView
+    private lateinit var fishingOverlay: org.terst.nav.ui.fishing.FishingOverlayView
+    private lateinit var fabFishing: FloatingActionButton
+    private lateinit var fishingModeManager: org.terst.nav.ui.fishing.FishingModeManager
+    private var lastCogDeg: Double = 0.0
 
     // HUD value TextViews
     private lateinit var hudSog: TextView
@@ -275,6 +279,7 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
         setupBottomNavigation()
         setupHandlers()
         setupMap()
+        setupFishingMode()
         // Hidden dev log — long-press the drag handle on the instrument sheet
         findViewById<View>(R.id.drag_handle).setOnLongClickListener {
             DevLogSheet().show(supportFragmentManager, "dev_log")
@@ -689,6 +694,7 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
                 mapHandler?.setupWindLayer(style, windArrowBitmap)
                 mapHandler?.setupFadLayer(style, layerManager.fadsEnabled)
                 mapHandler?.updateFadLayer(FadData.toFeatures())
+                mapHandler?.setupFishingLayer(style)
                 // Eagerly load conditions at style-ready time so the HUD is never blank
                 // on startup — the camera-idle may fire before GPS fixes, this is the backstop.
                 maplibreMap.cameraPosition.target?.let { center ->
@@ -731,6 +737,42 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
         }
     }
 
+    private fun setupFishingMode() {
+        fishingOverlay = findViewById(R.id.fishing_overlay)
+        fabFishing = findViewById(R.id.fab_fishing)
+        fishingModeManager = org.terst.nav.ui.fishing.FishingModeManager(this)
+
+        fabFishing.setOnClickListener {
+            val active = !fishingModeManager.isActive
+            fishingModeManager.isActive = active
+            fishingOverlay.visibility = if (active) View.VISIBLE else View.GONE
+            loadedStyleFlow.value?.let { style ->
+                layerManager.setSstEnabled(style, active)
+            }
+            updateFishingOverlay()
+        }
+
+        if (fishingModeManager.isActive) {
+            fishingOverlay.visibility = View.VISIBLE
+        }
+    }
+
+    private fun updateFishingOverlay() {
+        if (!fishingModeManager.isActive) return
+        val cond = viewModel.marineConditions.value ?: return
+        val pos  = viewModel.currentPosition.value ?: return
+        val target = fishingModeManager.computeTarget(
+            boatLat       = pos.first,
+            boatLon       = pos.second,
+            boatCogDeg    = lastCogDeg,
+            tempC         = cond.tempC ?: return,
+            currentKt     = cond.currentSpeedKt ?: 0.0,
+            currentDirDeg = cond.currentDirDeg ?: 0.0
+        ) ?: return
+        fishingOverlay.bind(target)
+        mapHandler?.updateFishingBearing(pos.first, pos.second, target.bearingDeg)
+    }
+
     private var thermalAlarmPlayer: MediaPlayer? = null
 
     private fun startThermalMonitoring() {
@@ -797,6 +839,7 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
                 mapHandler?.centerOnLocation(gpsData.latitude, gpsData.longitude)
                 mapHandler?.updateUserPosition(gpsData.latitude, gpsData.longitude, gpsData.cog.toFloat())
                 viewModel.addGpsPoint(gpsData.latitude, gpsData.longitude, gpsData.sog, gpsData.cog)
+                lastCogDeg = gpsData.cog
                 // HUD — SOG and COG from GPS
                 lastSogKnots = gpsData.sog
                 hudSog.text = unitPrefs.formatSpeed(gpsData.sog)
@@ -854,6 +897,7 @@ class MainActivity : AppCompatActivity(), SafetyFragment.SafetyListener {
                 if (c == null) return@collect
                 lastConditions = c
                 applyConditions(c)
+                updateFishingOverlay()
             }
         }
         val conditionSpinners = listOf(
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 d3b7942..1a54722 100644
--- a/android-app/app/src/main/res/layout/activity_main.xml
+++ b/android-app/app/src/main/res/layout/activity_main.xml
@@ -102,6 +102,31 @@
                 android:focusable="true"
                 android:background="?attr/colorSurface" />
 
+            <!-- Fishing mode overlay card — bottom-start, above bottom sheet -->
+            <org.terst.nav.ui.fishing.FishingOverlayView
+                android:id="@+id/fishing_overlay"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="8dp"
+                android:layout_marginBottom="140dp"
+                android:visibility="gone"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent" />
+
+            <!-- Fishing mode FAB — bottom-start -->
+            <com.google.android.material.floatingactionbutton.FloatingActionButton
+                android:id="@+id/fab_fishing"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_marginStart="16dp"
+                android:layout_marginBottom="80dp"
+                android:src="@drawable/ic_fish"
+                android:contentDescription="Fishing mode"
+                app:fabSize="mini"
+                app:elevation="8dp"
+                app:layout_constraintBottom_toBottomOf="parent"
+                app:layout_constraintStart_toStartOf="parent" />
+
             <com.google.android.material.button.MaterialButton
                 android:id="@+id/fab_recenter"
                 android:layout_width="wrap_content"