Fix long messages not being clickable (#6356)

* Fix long messages not being clickable

As @bmarty found out, `clip = true` causes the click event to be ignored in some cases. Since we have the shape we want to draw and we're using a custom `onDraw` modifier anyway to cut-out part of the path, we can just draw everything using the modifier and avoid using `clip = true`.

This seems to fix the issue.

* Fix clipping of images or other items that cover the bubble

* Fix borders being displayed for contents

* Extract the layer drawing logic into `drawInLayer` to simplify the inlined code. Remove redundant code, those changes are now in the `drawInLayer` block

* Workaround for lint issue: it seems like detekt can't properly detect usages in content receivers

* Update screenshots

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

libraries/ui-utils/src/main/kotlin/io/element/android/libraries/ui/utils/graphics/DrawInLayer.kt

@@ -0,0 +1,35 @@
+/*
+ * 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.libraries.ui.utils.graphics
+
+import androidx.compose.ui.draw.CacheDrawScope
+import androidx.compose.ui.graphics.Outline
+import androidx.compose.ui.graphics.drawscope.ContentDrawScope
+import androidx.compose.ui.graphics.layer.CompositingStrategy
+import androidx.compose.ui.graphics.layer.drawLayer
+import androidx.compose.ui.graphics.layer.setOutline
+
+/**
+ * Draws the content of [recordBlock] in a separate layer, which can be customized using [composingStrategy], [outline] and [clip].
+ */
+context(scope: androidx.compose.ui.graphics.drawscope.DrawScope)
+fun CacheDrawScope.drawInLayer(
+    composingStrategy: CompositingStrategy = CompositingStrategy.Auto,
+    outline: Outline? = null,
+    clip: Boolean = false,
+    recordBlock: ContentDrawScope.() -> Unit,
+) {
+    val layer = obtainGraphicsLayer().apply {
+        this.compositingStrategy = composingStrategy
+        this.clip = clip
+        outline?.let { this.setOutline(it) }
+
+        record(block = recordBlock)
+    }
+    scope.drawLayer(layer)
+}