fix(fws-hello): set window type hint to dialog and prevent resizing

Import Gdk and GLib modules to properly configure window behavior.

Set deterministic WM_CLASS using GLib.set_prgname() so that i3/Hyprland
window rules targeting "fws-hello" floating window behavior work correctly.

Set window type hint to DIALOG and disable resizing to ensure the window
remains floating with its natural size instead of being stretched across
the entire workspace, which would result in unreadable layout.

configs/releng/airootfs/usr/local/bin/fws-hello

@@ -16,7 +16,12 @@ import sys
 import gi
 
 gi.require_version("Gtk", "3.0")
-from gi.repository import Gtk  # noqa: E402
+gi.require_version("Gdk", "3.0")  # sinon gi charge Gdk 4.0 (conflit avec Gtk3)
+from gi.repository import Gdk, GLib, Gtk  # noqa: E402
+
+# WM_CLASS déterministe : les règles i3/Hyprland « fenêtre flottante »
+# ciblent cette classe.
+GLib.set_prgname("fws-hello")
 
 _FLAG = os.path.expanduser("~/.config/fws/hello-done")
 
@@ -69,6 +74,11 @@ class HelloWindow(Gtk.Window):
         self.set_default_size(460, -1)
         self.set_position(Gtk.WindowPosition.CENTER)
         self.set_border_width(18)
+        # DIALOGUE : les tuileurs (i3/Hyprland) laissent les dialogues en
+        # flottant → la fenêtre garde sa taille naturelle au lieu d'être
+        # étirée sur tout l'espace de travail (layout illisible sinon).
+        self.set_type_hint(Gdk.WindowTypeHint.DIALOG)
+        self.set_resizable(False)
 
         box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=12)
         self.add(box)