Remove Showkase from the project.

libraries/designsystem/build.gradle.kts

@@ -10,7 +10,6 @@ import extension.testCommonDependencies
 
 plugins {
     id("io.element.android-compose-library")
-    alias(libs.plugins.ksp)
     id("kotlin-parcelize")
 }
 
@@ -20,12 +19,6 @@ android {
     buildFeatures {
         buildConfig = true
     }
-
-    buildTypes {
-        getByName("release") {
-            consumerProguardFiles("consumer-rules.keep")
-        }
-    }
 }
 
 dependencies {
@@ -43,8 +36,5 @@ dependencies {
     implementation(projects.libraries.testtags)
     implementation(projects.libraries.uiStrings)
 
-    ksp(libs.showkase.processor)
-    implementation(libs.showkase)
-
     testCommonDependencies(libs)
 }

libraries/designsystem/consumer-rules.keep

@@ -1,5 +0,0 @@
-# Showkase generates this class, and Showkase's ShowkaseBrowserActivity loads it reflectively with
-# Class.forName(...).getDeclaredConstructor().newInstance(), so its constructor must be kept too.
--keep class io.element.android.libraries.designsystem.showkase.DesignSystemShowkaseRootModuleCodegen {
-    <init>();
-}

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/preview/WithFontScale.kt

@@ -14,8 +14,8 @@ import androidx.compose.ui.platform.LocalDensity
 import androidx.compose.ui.unit.Density
 
 /**
- * Showkase does not take into account the `fontScale` parameter of the Preview annotation, so alter the
- * LocalDensity in the CompositionLocalProvider.
+ * Render the content at the given font scale, by altering the `LocalDensity` in the
+ * CompositionLocalProvider. Useful to preview a Composable at several font scales.
  */
 @Composable
 fun WithFontScale(fontScale: Float, content: @Composable () -> Unit) {

libraries/designsystem/src/main/kotlin/io/element/android/libraries/designsystem/showkase/DesignSystemShowkaseRootModule.kt

@@ -1,15 +0,0 @@
-/*
- * Copyright (c) 2025 Element Creations Ltd.
- * Copyright 2022-2025 New Vector Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
- * Please see LICENSE files in the repository root for full details.
- */
-
-package io.element.android.libraries.designsystem.showkase
-
-import com.airbnb.android.showkase.annotation.ShowkaseRoot
-import com.airbnb.android.showkase.annotation.ShowkaseRootModule
-
-@ShowkaseRoot
-class DesignSystemShowkaseRootModule : ShowkaseRootModule