feat(map): Persist Google Maps camera position (#3605)

Signed-off-by: James Rich <2199651+jamesarich@users.noreply.github.com>

core/prefs/src/google/kotlin/org/meshtastic/core/prefs/map/GoogleMapsPrefs.kt

@@ -19,6 +19,8 @@ package org.meshtastic.core.prefs.map
 
 import android.content.SharedPreferences
 import com.google.maps.android.compose.MapType
+import org.meshtastic.core.prefs.DoublePrefDelegate
+import org.meshtastic.core.prefs.FloatPrefDelegate
 import org.meshtastic.core.prefs.NullableStringPrefDelegate
 import org.meshtastic.core.prefs.StringSetPrefDelegate
 import org.meshtastic.core.prefs.di.GoogleMapsSharedPreferences
@@ -30,6 +32,11 @@ interface GoogleMapsPrefs {
     var selectedGoogleMapType: String?
     var selectedCustomTileUrl: String?
     var hiddenLayerUrls: Set<String>
+    var cameraTargetLat: Double
+    var cameraTargetLng: Double
+    var cameraZoom: Float
+    var cameraTilt: Float
+    var cameraBearing: Float
 }
 
 @Singleton
@@ -38,4 +45,9 @@ class GoogleMapsPrefsImpl @Inject constructor(@GoogleMapsSharedPreferences prefs
         NullableStringPrefDelegate(prefs, "selected_google_map_type", MapType.NORMAL.name)
     override var selectedCustomTileUrl: String? by NullableStringPrefDelegate(prefs, "selected_custom_tile_url", null)
     override var hiddenLayerUrls: Set<String> by StringSetPrefDelegate(prefs, "hidden_layer_urls", emptySet())
+    override var cameraTargetLat: Double by DoublePrefDelegate(prefs, "camera_target_lat", 0.0)
+    override var cameraTargetLng: Double by DoublePrefDelegate(prefs, "camera_target_lng", 0.0)
+    override var cameraZoom: Float by FloatPrefDelegate(prefs, "camera_zoom", 7f)
+    override var cameraTilt: Float by FloatPrefDelegate(prefs, "camera_tilt", 0f)
+    override var cameraBearing: Float by FloatPrefDelegate(prefs, "camera_bearing", 0f)
 }

core/prefs/src/main/kotlin/org/meshtastic/core/prefs/DoublePrefDelegate.kt

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.meshtastic.core.prefs
+
+import android.content.SharedPreferences
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+class DoublePrefDelegate(
+    private val preferences: SharedPreferences,
+    private val key: String,
+    private val defaultValue: Double,
+) : ReadWriteProperty<Any?, Double> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Double = preferences
+        .getFloat(key, defaultValue.toFloat())
+        .toDouble() // SharedPreferences doesn't have putDouble, so convert to float
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Double) {
+        preferences
+            .edit()
+            .putFloat(key, value.toFloat())
+            .apply() // SharedPreferences doesn't have putDouble, so convert to float
+    }
+}

core/prefs/src/main/kotlin/org/meshtastic/core/prefs/FloatPrefDelegate.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2025 Meshtastic LLC
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package org.meshtastic.core.prefs
+
+import android.content.SharedPreferences
+import kotlin.properties.ReadWriteProperty
+import kotlin.reflect.KProperty
+
+class FloatPrefDelegate(
+    private val preferences: SharedPreferences,
+    private val key: String,
+    private val defaultValue: Float,
+) : ReadWriteProperty<Any?, Float> {
+    override fun getValue(thisRef: Any?, property: KProperty<*>): Float = preferences.getFloat(key, defaultValue)
+
+    override fun setValue(thisRef: Any?, property: KProperty<*>, value: Float) {
+        preferences.edit().putFloat(key, value).apply()
+    }
+}