feat: move Files to its own process; add window server messaging (multi-format clipboard, drag and drop), undo/redo, sidebar, breadcrumbs, thumbnails, file type icons, New menu and proper text fields

kernel/src/Api/Window.hpp

@@ -2,7 +2,9 @@
     * Window.hpp
     * SYS_WINCREATE, SYS_WINDESTROY, SYS_WINPRESENT, SYS_WINPOLL,
     * SYS_WINENUM, SYS_WINMAP, SYS_WINSENDEVENT, SYS_WINRESIZE,
-    * SYS_WINSETCURSOR, SYS_WINSETFLAGS, SYS_WINSETSCALE, SYS_WINGETSCALE syscalls
+    * SYS_WINSETCURSOR, SYS_WINSETFLAGS, SYS_WINSETSCALE, SYS_WINGETSCALE syscalls,
+    * and window server messaging: SYS_WIN_REQUEST, SYS_WIN_REQUEST_POLL,
+    * SYS_WIN_DRAG_BEGIN, SYS_WIN_DRAG_FORMATS, SYS_WIN_DRAG_GET_DATA
     * Copyright (c) 2026 Daniel Hammer
 */
 
@@ -92,4 +94,41 @@ namespace montauk::abi {
     static int Sys_WinGetScale() {
         return WinServer::GetScale();
     }
+
+    // Any app may post requests, but only about its own windows (checked in
+    // WinServer); only the compositor may read them back.
+    static int Sys_WinRequest(int windowId, const WinRequest* request) {
+        if (request == nullptr) return InvalidArgument;
+        WinRequest copy = *request;
+        return WinServer::PostRequest(windowId, Sched::GetCurrentPid(), copy);
+    }
+
+    static int Sys_WinRequestPoll(WinRequest* out) {
+        if (!Sched::HasCapability(CAP_COMPOSITOR)) return CapabilityDenied;
+        if (out == nullptr) return InvalidArgument;
+        return WinServer::PollRequest(out);
+    }
+
+    static int Sys_WinDragBegin(int windowId, const WinDragBegin* info,
+                                const TransferItem* items, uint32_t count) {
+        if (info == nullptr) return InvalidArgument;
+        WinDragBegin infoCopy = *info;
+        DataTransfer::Transfer transfer;
+        int rc = DataTransfer::BuildFromUser(items, count, transfer);
+        if (rc != Success) return rc;
+        return WinServer::DragBegin(windowId, Sched::GetCurrentPid(),
+                                    Sched::HasCapability(CAP_COMPOSITOR), infoCopy, transfer);
+    }
+
+    static int Sys_WinDragFormats(uint32_t serial, TransferFormatInfo* out, uint32_t max) {
+        return WinServer::DragFormats(serial, Sched::GetCurrentPid(),
+                                      Sched::HasCapability(CAP_COMPOSITOR), out, max);
+    }
+
+    static int Sys_WinDragGetData(uint32_t serial, const char* mime, void* buffer,
+                                  uint32_t bufferLen, uint32_t* outLen) {
+        return WinServer::DragGetData(serial, Sched::GetCurrentPid(),
+                                      Sched::HasCapability(CAP_COMPOSITOR), mime,
+                                      buffer, bufferLen, outLen);
+    }
 };