Rebrand from Casera/MyCrib to honeyDue

Total rebrand across KMM project:
- Kotlin package: com.example.casera -> com.tt.honeyDue (dirs + declarations)
- Gradle: rootProject.name, namespace, applicationId
- Android: manifest, strings.xml (all languages), widget resources
- iOS: pbxproj bundle IDs, Info.plist, entitlements, xcconfig
- iOS directories: Casera/ -> HoneyDue/, CaseraTests/ -> HoneyDueTests/, etc.
- Swift source: all class/struct/enum renames
- Deep links: casera:// -> honeydue://, .casera -> .honeydue
- App icons replaced with honeyDue honeycomb icon
- Domains: casera.treytartt.com -> honeyDue.treytartt.com
- Bundle IDs: com.tt.casera -> com.tt.honeyDue
- Database table names preserved

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

composeApp/src/commonMain/kotlin/com/tt/honeyDue/data/PersistenceManager.kt

@@ -0,0 +1,34 @@
+package com.tt.honeyDue.data
+
+/**
+ * Platform-specific persistence manager for storing app data to disk.
+ * Each platform implements this using their native storage mechanisms.
+ *
+ * Android: SharedPreferences
+ * iOS: UserDefaults
+ * JVM: Properties file
+ * Wasm: LocalStorage
+ */
+@Suppress("NO_ACTUAL_FOR_EXPECT")
+expect class PersistenceManager {
+    /**
+     * Save a string value to persistent storage.
+     */
+    fun save(key: String, value: String)
+
+    /**
+     * Load a string value from persistent storage.
+     * Returns null if the key doesn't exist.
+     */
+    fun load(key: String): String?
+
+    /**
+     * Remove a specific key from storage.
+     */
+    fun remove(key: String)
+
+    /**
+     * Clear all stored data.
+     */
+    fun clear()
+}