refactor(tui): migrate renderer from Mosaic to tamboui

Replaces the Mosaic 0.18 string-frame renderer with tamboui 0.2.1-SNAPSHOT
to unlock a cell buffer, widget catalog, and real layout engine. Domain
core (state/reducer/ws/input) is unchanged; only the renderer and the key
mapper are rewritten. Fixes a latent Mosaic-mapper bug where q/n/c/a/r/s//
were swallowed inside input modes by making the new mapper mode-aware.

apps/tui/build.gradle

@@ -1,12 +1,22 @@
 plugins {
     id 'org.jetbrains.kotlin.jvm'
     id 'org.jetbrains.kotlin.plugin.serialization'
-    id 'org.jetbrains.kotlin.plugin.compose'
     id 'application'
 }
 
 application {
-    mainClass = 'com.correx.apps.tui.MainKt'
+    mainClass = 'com.correx.apps.tui.TuiAppKt'
+}
+
+repositories {
+    maven {
+        url 'https://central.sonatype.com/repository/maven-snapshots/'
+        mavenContent { snapshotsOnly() }
+    }
+}
+
+configurations.all {
+    resolutionStrategy.cacheChangingModulesFor 0, 'seconds'
 }
 
 dependencies {
@@ -19,7 +29,11 @@ dependencies {
     implementation "io.ktor:ktor-client-websockets:$ktor_version"
     implementation "io.ktor:ktor-client-logging:$ktor_version"
 
-    implementation "com.jakewharton.mosaic:mosaic-runtime:0.18.0"
+    implementation platform('dev.tamboui:tamboui-bom:0.2.1-SNAPSHOT')
+    implementation 'dev.tamboui:tamboui-tui'
+    implementation 'dev.tamboui:tamboui-widgets'
+    implementation 'dev.tamboui:tamboui-core'
+    runtimeOnly 'dev.tamboui:tamboui-jline3-backend'
     implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$kotlinx_coroutines_version"
     implementation "org.jetbrains.kotlinx:kotlinx-serialization-json:$kotlinx_serialization_version"
 
@@ -31,6 +45,19 @@ dependencies {
 
 tasks.named('test') { useJUnitPlatform() }
 
+tasks.register('tuiStartScripts', CreateStartScripts) {
+    mainClass = 'com.correx.apps.tui.TuiAppKt'
+    applicationName = 'tui'
+    outputDir = file("$buildDir/scripts-tui")
+    classpath = tasks.named('startScripts').get().classpath
+}
+
+distributions.named('main').configure {
+    contents {
+        from(tasks.named('tuiStartScripts')) { into 'bin' }
+    }
+}
+
 tasks.withType(Tar).configureEach { duplicatesStrategy = DuplicatesStrategy.EXCLUDE }
 tasks.withType(Zip).configureEach { duplicatesStrategy = DuplicatesStrategy.EXCLUDE }
 tasks.named("installDist") { duplicatesStrategy = DuplicatesStrategy.EXCLUDE }