qwen3.6:35b's first attempt, does not compile (yet).

gui/shared/src@jvm/PlatformJvm.kt

@@ -0,0 +1,59 @@
+package com.hyperling.weather
+
+import java.io.File
+
+/**
+ * JVM Implementation of StorageBackend for Desktop use.
+ */
+class JvmStorageBackendImpl : StorageBackend {
+    private val STORAGE_DIR = File(System.getProperty("user.home"), ".nomadic-weather")
+    private val STORAGE_FILE = File(STORAGE_DIR, "locations.json")
+
+    init {
+        STORAGE_DIR.mkdirs()
+    }
+
+    override fun load(): List<LocationEntry> {
+        return try {
+            if (STORAGE_FILE.exists()) LocationSerializer.jsonToLocations(STORAGE_FILE.readText()) else emptyList()
+        } catch (e: Exception) {
+            emptyList()
+        }
+    }
+
+    override fun save(locations: List<LocationEntry>) {
+        try {
+            STORAGE_DIR.mkdirs()
+            STORAGE_FILE.writeText(LocationSerializer.locationsToJson(locations))
+        } catch (e: Exception) {}
+    }
+
+    override fun saveOne(location: LocationEntry) {
+        val ex = load().toMutableList()
+        val idx = ex.indexOfFirst { it == location }
+        if (idx >= 0) ex[idx] = location 
+        else { 
+            if (ex.size >= 8) ex.removeAt(0)
+            ex.add(location)
+        }
+        save(ex)
+    }
+
+    override fun delete(id: Long) {
+        save(load().filter { it.id != id })
+    }
+}
+
+/**
+ * JVM-specific platform initialization.
+ */
+class JvmPlatformInit : PlatformInit {
+    override fun initialize() {
+        val dir = File(System.getProperty("user.home"), ".nomadic-weather")
+        if (!dir.exists()) dir.mkdirs()
+        println("Nomadic Weather Desktop Initialized")
+    }
+}
+
+actual fun getPlatformStorage(): StorageBackend = JvmStorageBackendImpl()
+actual fun getPlatformInit(): PlatformInit = JvmPlatformInit()