[desktop] refactor profile management and fix some misc bugs with it (#3415)

Adding and editing users is now done in a single dialog rather than all those other individual buttons and dialogs like before.

Fixed some bugs with profile management too, and made edit/delete a right-click menu.

Signed-off-by: crueter <crueter@eden-emu.dev>
Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/3415

src/core/hle/service/acc/profile_manager.cpp

@@ -1,4 +1,4 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 // SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
@@ -98,6 +98,7 @@ bool ProfileManager::RemoveProfileAtIndex(std::size_t index) {
 
 void ProfileManager::RemoveAllProfiles()
 {
+    user_count = 0;
     profiles = {};
 }