Implement month separator for the Gallery.

Improve day separator rendering in the timeline.
Use Today, Yesterday, and the name of the day if less than 7 days and do not render the year for the current year.
Improve date format for the media viewer.
Rework how date and time are computed.
ActionListView: Time can take more space, so update the layout.

tests/testutils/build.gradle.kts

@@ -24,6 +24,7 @@ dependencies {
     implementation(projects.libraries.architecture)
     implementation(projects.libraries.core)
     implementation(projects.libraries.uiStrings)
+    implementation(projects.services.toolbox.api)
     implementation(libs.test.turbine)
     implementation(libs.molecule.runtime)
     implementation(libs.androidx.compose.ui.test.junit)

tests/testutils/src/main/kotlin/io/element/android/tests/testutils/InstrumentationStringProvider.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.tests.testutils
+
+import androidx.test.platform.app.InstrumentationRegistry
+import io.element.android.services.toolbox.api.strings.StringProvider
+
+class InstrumentationStringProvider : StringProvider {
+    private val resource = InstrumentationRegistry.getInstrumentation().context.resources
+    override fun getString(resId: Int): String {
+        return resource.getString(resId)
+    }
+
+    override fun getString(resId: Int, vararg formatArgs: Any?): String {
+        return resource.getString(resId, *formatArgs)
+    }
+
+    override fun getQuantityString(resId: Int, quantity: Int, vararg formatArgs: Any?): String {
+        return resource.getQuantityString(resId, quantity, *formatArgs)
+    }
+}