feat(mail-overview): component skeleton with the keepalive window

Nothing is drawn yet. This commit exists on its own because the thing most
likely to be wrong at this stage is invisible: a config whose only window is
hidden exits straight after logging Configuration Loaded, reporting no error,
and the symptom is a keybind that appears to do nothing.

Theme.qml is a verbatim copy of the one in appearance. It is a fallback for
before the generated palette is read, not a palette to grow; deduplicating
the four copies is a separate change.

Not yet run: the user runs the shell themselves, so loading and IPC are
verified in their session rather than here.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01WWL8JYHu7yhAdtx5pU9PMU

1 files changed, 41 insertions, 0 deletions

diff --git a/mail-overview/MailPanel.qml b/mail-overview/MailPanel.qml
new file mode 100644
index 0000000..7e81a33
--- /dev/null
+++ b/mail-overview/MailPanel.qml
@@ -0,0 +1,41 @@
+// Copyright (C) 2026 Danilo M. <danix@danix.xyz>
+//
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License version 2 as
+// published by the Free Software Foundation.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+import Quickshell
+import Quickshell.Wayland
+import QtQuick
+
+Scope {
+    id: root
+
+    // Waybar runs on this screen, so the drawer belongs here too.
+    property string monitor: "DP-1"
+    property bool open: false
+
+    readonly property var screenObj:
+        Quickshell.screens.find(s => s.name === root.monitor) ?? Quickshell.screens[0]
+
+    function show() { root.open = true; }
+    function close() { root.open = false; }
+    function toggle() { root.open ? close() : show(); }
+
+    // Quickshell exits once no window is visible, and this drawer is closed
+    // most of the time. See AGENTS.md.
+    PanelWindow {
+        visible: true
+        implicitWidth: 1
+        implicitHeight: 1
+        color: "transparent"
+        exclusionMode: ExclusionMode.Ignore
+        mask: Region {}
+        WlrLayershell.keyboardFocus: WlrKeyboardFocus.None
+    }
+}