Use ShareIntentHandler early to avoid distributing the whole intent (#6274)

* Use `ShareIntentHandler` early to avoid distributing the whole intent

This would make the intent be serialized as part of `NavTarget` and could potentially lead to `TransactionTooLargeException`s.

We now pass a new `ShareIntentData` class around, containing the minimum amount of data needed. We also have a new `OnSharedData` post-processor to revoke uri access after they've been shared.

* Move `UriToShare` next to `ShareIntentData` and add docs

features/share/test/build.gradle.kts

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2026 Element Creations 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.features.share.test"
+}
+
+dependencies {
+    implementation(projects.features.share.api)
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.tests.testutils)
+}

features/share/test/src/main/kotlin/io/element/android/features/share/test/FakeShareIntentHandler.kt

@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2026 Element Creations 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.features.share.test
+
+import android.content.Intent
+import io.element.android.features.share.api.ShareIntentData
+import io.element.android.features.share.api.ShareIntentHandler
+
+class FakeShareIntentHandler(
+    private val onIncomingShareIntent: (Intent) -> ShareIntentData? = { null },
+) : ShareIntentHandler {
+    override fun handleIncomingShareIntent(
+        intent: Intent,
+    ): ShareIntentData? {
+        return onIncomingShareIntent(intent)
+    }
+}