v1.0.4: Fix tiptapToMarkdown JsonElement type casting

- tiptapToMarkdown used JsonObject.asMap() which returns Map<String, JsonElement>
- All 'as? String' casts silently failed (JsonPrimitive != String), returning empty
- Now uses Gson TypeToken<Map<String, Any?>> for proper raw type deserialization
- contentToMarkdown now handles Map types directly without serialize roundtrip

app/build.gradle.kts

@@ -20,8 +20,8 @@ android {
         applicationId = "com.docmost.app"
         minSdk = 26
         targetSdk = 34
-        versionCode = 4
-        versionName = "1.0.3"
+        versionCode = 5
+        versionName = "1.0.4"
     }
 
     signingConfigs {

app/src/main/java/com/docmost/app/ui/PageEditorActivity.kt

@@ -1877,9 +1877,9 @@ class PageEditorActivity : AppCompatActivity() {
 
     private fun tiptapToMarkdown(tiptapJson: String): String {
         return try {
-            val doc = gson.fromJson(tiptapJson, com.google.gson.JsonObject::class.java).asMap()
-            @Suppress("UNCHECKED_CAST")
-            extractText(doc as Map<String, Any?>)
+            val type = object : com.google.gson.reflect.TypeToken<Map<String, Any?>>() {}.type
+            val doc: Map<String, Any?> = gson.fromJson(tiptapJson, type)
+            extractText(doc)
         } catch (e: Exception) {
             tiptapJson
         }
@@ -2492,6 +2492,15 @@ class PageEditorActivity : AppCompatActivity() {
                 content
             }
         }
+        if (content is Map<*, *>) {
+            @Suppress("UNCHECKED_CAST")
+            return try {
+                extractText(content as Map<String, Any?>)
+            } catch (e: Exception) {
+                android.util.Log.e("PageEditor", "contentToMarkdown map error: ${e.message}")
+                ""
+            }
+        }
         return try {
             val json = gson.toJson(content)
             if (json.isNotEmpty() && json != "null") {