Use shared recent emoji reactions from account data (#5402)

* Use shared recent emoji reactions from account data

- Add `AddRecentEmoji` and `GetRecentEmojis` use cases to avoid injecting the whole `MatrixClient` for just one of these operations.
- Update the UI and logic of the emoji picker and message context menu to include the recent emojis.
- Add `CoroutineDispatchers.Default` with the defaults coroutines to use in the app for ease of use.

* Instead of replacing suggested emojis, concatenate recent ones removing duplicates

* Update screenshots

---------

Co-authored-by: ElementBot <android@element.io>

libraries/matrix/api/src/main/kotlin/io/element/android/libraries/matrix/api/MatrixClient.kt

@@ -173,6 +173,16 @@ interface MatrixClient {
      * Returns the maximum file upload size allowed by the Matrix server.
      */
     suspend fun getMaxFileUploadSize(): Result<Long>
+
+    /**
+     * Returns the list of shared recent emoji reactions for this account.
+     */
+    suspend fun getRecentEmojis(): Result<List<String>>
+
+    /**
+     * Adds an emoji to the list of recent emoji reactions for this account.
+     */
+    suspend fun addRecentEmoji(emoji: String): Result<Unit>
 }
 
 /**

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

@@ -0,0 +1,30 @@
+/*
+ * 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.matrix.api.recentemojis
+
+import dev.zacsweers.metro.ContributesBinding
+import dev.zacsweers.metro.Inject
+import io.element.android.libraries.core.coroutine.CoroutineDispatchers
+import io.element.android.libraries.di.SessionScope
+import io.element.android.libraries.matrix.api.MatrixClient
+import kotlinx.coroutines.withContext
+
+fun interface GetRecentEmojis {
+    suspend operator fun invoke(): Result<List<String>>
+}
+
+@ContributesBinding(SessionScope::class)
+@Inject
+class DefaultGetRecentEmojis(
+    private val client: MatrixClient,
+    private val dispatchers: CoroutineDispatchers,
+) : GetRecentEmojis {
+    override suspend operator fun invoke(): Result<List<String>> = withContext(dispatchers.io) {
+        client.getRecentEmojis()
+    }
+}