Fix Vulkan presenter synchronization and frame handling issues (#747)

* [VideoOut/Vulkan] Fix boot deadlock, writeback stall, and presentation bugs

- Presenter thread now starts on the compute dispatch path too, fixing
  a boot deadlock when a title's first GPU work is compute (Ghost of
  Yotei G-Buffer clear).
- Guest render-target format swaps between sibling pixel formats now
  reinterpret in place instead of recreating blank, preserving
  GPU-written content.
- Vectorized the guest-buffer writeback scan (equal-byte skip + coarse
  per-page pre-check), fixing multi-second stalls on fragmented buffers
  that starved JobWorker completion signals.
- _presentedSequence now advances on every Render() early-return path,
  fixing an unthrottled busy loop on stale/dropped presentations.

* Remove unnecessary Silk.NET.Windowing dependency

src/SharpEmu.Libs/VideoOut/FlipProgressTracker.cs

@@ -0,0 +1,36 @@
+// Copyright (C) 2026 SharpEmu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+using System.Diagnostics;
+using System.Threading;
+
+namespace SharpEmu.Libs.VideoOut;
+
+public static class FlipProgressTracker
+{
+    private static long _lastFlipTimestamp;
+    private static long _lastFlipVersion;
+    private static int _hasFlipped;
+
+    public static void RecordFlip(long version)
+    {
+        Volatile.Write(ref _lastFlipVersion, version);
+        Volatile.Write(ref _lastFlipTimestamp, Stopwatch.GetTimestamp());
+        Volatile.Write(ref _hasFlipped, 1);
+    }
+
+    public static bool HasFlipped => Volatile.Read(ref _hasFlipped) != 0;
+
+    public static long LastFlipVersion => Volatile.Read(ref _lastFlipVersion);
+
+    public static double? SecondsSinceLastFlip()
+    {
+        if (Volatile.Read(ref _hasFlipped) == 0)
+        {
+            return null;
+        }
+
+        var elapsedTicks = Stopwatch.GetTimestamp() - Volatile.Read(ref _lastFlipTimestamp);
+        return elapsedTicks / (double)Stopwatch.Frequency;
+    }
+}