Update Send button bg color (#5170)

* Update Send button bg color

Change the gradient bg to accent/rest.

* Tidy-up ComposerToolbar to match iOS 18 Figma.

Also simplifies the tests a bit.

* Add a .glassEffect to Compound's SendButton.

* Add a border to TimelineReplyView.

Also use the same sizes in both the message bubbles and the composer.

* Change icon size and container in message bubbles

- Container size = 36x36px
- Icon size = 24x24px

* Update icon of reply contents to be 24x24

* Update the VoiceMessageButton to match the designs.

* Adopt Liquid Glass in the ComposerToolbar.

* Generate and fix snapshots.

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Co-authored-by: Doug <douglase@element.io>

AccessibilityTests/Sources/GeneratedAccessibilityTests.swift

@@ -867,6 +867,10 @@ extension AccessibilityTests {
         try await performAccessibilityAudit(named: "VoiceMessageRoomTimelineView_Previews")
     }
 
+    func testVoiceMessageTrashButton() async throws {
+        try await performAccessibilityAudit(named: "VoiceMessageTrashButton_Previews")
+    }
+
     func testWaveformCursorView() async throws {
         try await performAccessibilityAudit(named: "WaveformCursorView_Previews")
     }