Enhance GTK theme configuration and taskbar setup in cloud-init scripts</message>

<message>Update the cloud-init scripts to improve GTK theme settings by enforcing dark mode through gsettings and preserving the icon theme for a cohesive user experience. Additionally, enhance the first-boot script to install a Chromium kiosk launcher icon on the desktop and in the application menu, along with a five-tap close functionality for Chromium. These changes streamline the user interface and ensure a consistent dark theme across applications and the taskbar.

emmc-provisioning/cloud-init/five-tap-close-chromium.py

@@ -0,0 +1,89 @@
+#!/usr/bin/env python3
+# 5 taps in the top-right corner of the screen close Chromium (kiosk).
+# Run from session autostart. Requires: python3, PyGObject (Gtk), Wayland or X11.
+
+import subprocess
+import sys
+
+try:
+    import gi
+    gi.require_version("Gdk", "3.0")
+    gi.require_version("Gtk", "3.0")
+    from gi.repository import Gdk, Gtk, GLib
+except Exception as e:
+    sys.stderr.write("five-tap-close-chromium: need PyGObject Gtk: %s\n" % e)
+    sys.exit(1)
+
+CORNER_SIZE = 80
+TAP_WINDOW_SEC = 2.0
+CHROMIUM_KILL_CMD = ["pkill", "-f", "chromium"]
+
+
+def get_screen_size():
+    display = Gdk.Display.get_default()
+    if not display:
+        return 800, 1280
+    monitor = display.get_monitor(0) if display.get_n_monitors() else None
+    if monitor:
+        geom = monitor.get_geometry()
+        return geom.width, geom.height
+    return 800, 1280
+
+
+def on_button_press(widget, event, data):
+    count, reset_timer = data
+    count[0] += 1
+    if reset_timer[0]:
+        GLib.source_remove(reset_timer[0])
+    if count[0] >= 5:
+        count[0] = 0
+        try:
+            subprocess.run(CHROMIUM_KILL_CMD, timeout=2, capture_output=True)
+        except Exception:
+            pass
+        if reset_timer[0]:
+            GLib.source_remove(reset_timer[0])
+        reset_timer[0] = None
+        return
+    def reset():
+        count[0] = 0
+        reset_timer[0] = None
+        return False
+    reset_timer[0] = GLib.timeout_add(int(TAP_WINDOW_SEC * 1000), reset)
+    return False
+
+
+def main():
+    win = Gtk.Window()
+    win.set_decorated(False)
+    win.set_resizable(False)
+    win.set_default_size(CORNER_SIZE, CORNER_SIZE)
+    win.set_skip_taskbar_hint(True)
+    win.set_skip_pager_hint(True)
+    win.set_keep_above(True)
+    win.set_opacity(0.01)
+    win.set_accept_focus(False)
+    win.set_focus_on_map(False)
+    # Allow closing from compositor / taskbar
+    win.connect("destroy", Gtk.main_quit)
+    # Count 5 taps
+    count = [0]
+    reset_timer = [None]
+    win.connect("button-press-event", on_button_press, (count, reset_timer))
+    # Touch events often come as button-press with button=1
+    win.set_events(
+        win.get_events()
+        | Gdk.EventMask.BUTTON_PRESS_MASK
+        | Gdk.EventMask.TOUCH_MASK
+    )
+    win.realize()
+    # Position top-right (after realization so we have a display)
+    w, h = get_screen_size()
+    x = max(0, w - CORNER_SIZE)
+    win.move(x, 0)
+    win.show_all()
+    Gtk.main()
+
+
+if __name__ == "__main__":
+    main()