redesign iOS round into fullscreen swipe flow

mobile/ios-app/Core/Media/HermesVideoPlayerView.swift

@@ -3,14 +3,16 @@ import SwiftUI
 
 struct HermesVideoPlayerView: View {
     @ObservedObject var coordinator: PlayerCoordinator
+    var cornerRadius: CGFloat = HermesTheme.cornerRadius
+    var fixedHeight: CGFloat? = 224
 
     var body: some View {
         VideoPlayer(player: coordinator.player)
             .frame(maxWidth: .infinity)
-            .frame(height: 224)
-            .clipShape(RoundedRectangle(cornerRadius: HermesTheme.cornerRadius, style: .continuous))
+            .frame(height: fixedHeight)
+            .clipShape(RoundedRectangle(cornerRadius: cornerRadius, style: .continuous))
             .overlay(
-                RoundedRectangle(cornerRadius: HermesTheme.cornerRadius, style: .continuous)
+                RoundedRectangle(cornerRadius: cornerRadius, style: .continuous)
                     .stroke(HermesTheme.accent.opacity(0.12), lineWidth: 1)
             )
             .background(HermesTheme.surfaceElevated)

mobile/ios-app/Core/Media/PlayerCoordinator.swift

@@ -27,11 +27,26 @@ final class PlayerCoordinator: ObservableObject {
         isPlaying = true
     }
 
+    func play(rate: Float) {
+        player.playImmediately(atRate: rate)
+        isPlaying = true
+    }
+
     func pause() {
         player.pause()
         isPlaying = false
     }
 
+    func seek(to timeMs: Int) {
+        let time = CMTime(seconds: Double(timeMs) / 1_000.0, preferredTimescale: 1_000)
+        player.seek(to: time)
+    }
+
+    func play(url: URL, startTimeMs: Int, rate: Float) {
+        prepareForPreview(url: url, startTimeMs: startTimeMs)
+        play(rate: rate)
+    }
+
     func restart(url: URL, startTimeMs: Int = 0) {
         prepareForPreview(url: url, startTimeMs: startTimeMs)
     }