[client] UI refactor (#6069)

Refactor UI

---------

Co-authored-by: Eduard Gert <kontakt@eduardgert.de>
Co-authored-by: braginini <bangvalo@gmail.com>
Co-authored-by: Pascal Fischer <32096965+pascal-fischer@users.noreply.github.com>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: riccardom <riccardomanfrin@gmail.com>

client/ui/services/cursor_linux.go

@@ -0,0 +1,53 @@
+//go:build linux
+
+package services
+
+/*
+#cgo pkg-config: x11
+#cgo LDFLAGS: -lX11
+#include <X11/Xlib.h>
+#include <stdlib.h>
+
+typedef struct CursorPoint {
+    int x;
+    int y;
+    int ok;
+} CursorPoint;
+
+// XQueryPointer works on X11 and, via XWayland, on Wayland sessions.
+// ok=0 when no X server is reachable.
+CursorPoint nbGetCursorPos(void) {
+    CursorPoint p = {0, 0, 0};
+    Display *dpy = XOpenDisplay(NULL);
+    if (!dpy) return p;
+    Window root = DefaultRootWindow(dpy);
+    if (root == 0) { XCloseDisplay(dpy); return p; }
+    Window root_return = 0, child_return = 0;
+    int root_x = 0, root_y = 0, win_x = 0, win_y = 0;
+    unsigned int mask_return = 0;
+    if (XQueryPointer(dpy, root, &root_return, &child_return,
+                      &root_x, &root_y, &win_x, &win_y, &mask_return)) {
+        p.x = root_x;
+        p.y = root_y;
+        p.ok = 1;
+    }
+    XCloseDisplay(dpy);
+    return p;
+}
+*/
+import "C"
+
+import "github.com/wailsapp/wails/v3/pkg/application"
+
+func getCursorPosition(app *application.App) (application.Point, bool) {
+	res := C.nbGetCursorPos()
+	if res.ok == 0 {
+		return application.Point{}, false
+	}
+	p := application.Point{X: int(res.x), Y: int(res.y)}
+	// X11 root coords are physical pixels; Screen.Bounds is in DIPs.
+	if app == nil || app.Screen == nil {
+		return p, true
+	}
+	return app.Screen.PhysicalToDipPoint(p), true
+}