New feature: Reorder pages (#20) (#38)

* Page reordering: backend

* Page reordering: user interface

* Improve handling of data inconsistencies

app/build.gradle.kts

@@ -4,6 +4,7 @@ plugins {
     alias(libs.plugins.kotlin.compose)
     alias(libs.plugins.aboutLibraries)
     alias(libs.plugins.protobuf)
+    alias(libs.plugins.kotlin.serialization)
 }
 
 val abiCodes = mapOf(
@@ -126,7 +127,9 @@ dependencies {
     }
     implementation(libs.icons.extended)
     implementation(libs.zoomable)
+    implementation(libs.reorderable)
     implementation(libs.aboutlibraries.compose.m3)
+    implementation(libs.kotlinx.serialization.json)
 
     testImplementation(libs.junit)
     testImplementation(libs.assertj)