[core, hle, video_core, memory] Improve multi-process, display layers, dynamic shader cache and rework overlay (#4238)

- [x] I have read and followed the [Contribution Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/CONTRIBUTING.md#code-contributions).
- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.

-------------------

- Dynamic shader cache reloading capability for qlaunch
- Multi-process improvements (thanks to @frank1734), instead of just using the main application we now respect caller process (also did it for HID devices while I was at it)
- Layer stack masks & shared buffer screenshot for video core, added different masks (screenshot, recording, etc.) this was discovered as an issue due to how in qlaunch the transition was not right between applications. May not be perfect but also fixes screenshots while using qlaunch
- Reworked overlay display management (input and visibility) - instead of random numbers as I've previously did, I decided to add an AppletZIndex enum for better readability. Also split capability of input by touch and gamepad.
- etc.

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4238
Reviewed-by: Samuel <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: MaranBr <maranbr@eden-emu.dev>

src/core/loader/nca.h

@@ -1,3 +1,6 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
@@ -11,6 +14,7 @@ class System;
 }
 
 namespace FileSys {
+class NACP;
 class NCA;
 }
 
@@ -21,7 +25,7 @@ class AppLoader_DeconstructedRomDirectory;
 /// Loads an NCA file
 class AppLoader_NCA final : public AppLoader {
 public:
-    explicit AppLoader_NCA(FileSys::VirtualFile file_);
+    explicit AppLoader_NCA(FileSys::VirtualFile file_, u64 update_only_program_id = 0);
     ~AppLoader_NCA() override;
 
     /**
@@ -43,14 +47,20 @@ public:
 
     ResultStatus ReadRomFS(FileSys::VirtualFile& dir) override;
     ResultStatus ReadProgramId(u64& out_program_id) override;
+    ResultStatus ReadControlData(FileSys::NACP& out_control) override;
+    ResultStatus ReadTitle(std::string& out_title) override;
 
     ResultStatus ReadBanner(std::vector<u8>& buffer) override;
     ResultStatus ReadLogo(std::vector<u8>& buffer) override;
 
     ResultStatus ReadNSOModules(Modules& modules) override;
 
+    u64 GetProgramId() const;
+
 private:
     std::unique_ptr<FileSys::NCA> nca;
+    u64 update_only_program_id{};
+    std::unique_ptr<FileSys::NACP> nacp;
     std::unique_ptr<AppLoader_DeconstructedRomDirectory> directory_loader;
 };