Display only valid emojis in recent emoji list (#5612)

* Create `:libraries:recentemojis` and move `AddRecentEmoji` and `GetRecentEmojis` there

- Make sure `GetRecentEmojis` won't return duplicate or invalid emojis.
- `ActionListPresenter` now handles merging suggested and recent emojis, not `ActionListView`.

libraries/recentemojis/api/build.gradle.kts

@@ -0,0 +1,26 @@
+import extension.setupDependencyInjection
+
+/*
+ * Copyright 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.
+ */
+
+plugins {
+    id("io.element.android-library")
+}
+
+android {
+    namespace = "io.element.android.libraries.recentemojis.api"
+}
+
+setupDependencyInjection()
+
+dependencies {
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.matrix.api)
+
+    implementation(libs.kotlinx.collections.immutable)
+    implementation(libs.matrix.emojibase.bindings)
+}

libraries/recentemojis/api/src/main/kotlin/io/element/android/libraries/recentemojis/api/AddRecentEmoji.kt

@@ -0,0 +1,23 @@
+/*
+ * Copyright 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.recentemojis.api
+
+import dev.zacsweers.metro.Inject
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.matrix.api.MatrixClient
+import kotlinx.coroutines.withContext
+
+@Inject
+class AddRecentEmoji(
+    private val client: MatrixClient,
+    private val dispatchers: CoroutineDispatchers,
+) {
+    suspend operator fun invoke(emoji: String): Result<Unit> = withContext(dispatchers.io) {
+        client.addRecentEmoji(emoji)
+    }
+}

libraries/recentemojis/api/src/main/kotlin/io/element/android/libraries/recentemojis/api/EmojibaseProvider.kt

@@ -0,0 +1,14 @@
+/*
+ * Copyright 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.recentemojis.api
+
+import io.element.android.emojibasebindings.EmojibaseStore
+
+interface EmojibaseProvider {
+    val emojibaseStore: EmojibaseStore
+}

libraries/recentemojis/api/src/main/kotlin/io/element/android/libraries/recentemojis/api/GetRecentEmojis.kt

@@ -0,0 +1,17 @@
+/*
+ * Copyright 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.recentemojis.api
+
+import kotlinx.collections.immutable.ImmutableList
+
+/**
+ * Returns the list of recently used emojis for reactions.
+ */
+fun interface GetRecentEmojis {
+    suspend operator fun invoke(): Result<ImmutableList<String>>
+}