calendar(dank): Add support for DankCalendar backend

- Add keyboard navigation to overview
- Add edit events to overview
- Add create events to overview
- Add setting for auto/khal/dankcalendar backend selection

quickshell/Common/DankSocket.qml

@@ -7,29 +7,31 @@ Item {
     property alias path: socket.path
     property alias parser: socket.parser
     property bool connected: false
+    property bool linkUp: false
 
     property int reconnectBaseMs: 400
     property int reconnectMaxMs: 15000
 
     property int _reconnectAttempt: 0
 
-    signal connectionStateChanged()
+    signal connectionStateChanged
 
     onConnectedChanged: {
-        socket.connected = connected
+        socket.connected = connected;
     }
 
     Socket {
         id: socket
 
         onConnectionStateChanged: {
-            root.connectionStateChanged()
+            root.linkUp = connected;
+            root.connectionStateChanged();
             if (connected) {
-                root._reconnectAttempt = 0
-                return
+                root._reconnectAttempt = 0;
+                return;
             }
             if (root.connected) {
-                root._scheduleReconnect()
+                root._scheduleReconnect();
             }
         }
     }
@@ -39,24 +41,24 @@ Item {
         interval: 0
         repeat: false
         onTriggered: {
-            socket.connected = false
-            Qt.callLater(() => socket.connected = true)
+            socket.connected = false;
+            Qt.callLater(() => socket.connected = true);
         }
     }
 
     function send(data) {
-        const json = typeof data === "string" ? data : JSON.stringify(data)
-        const message = json.endsWith("\n") ? json : json + "\n"
-        socket.write(message)
-        socket.flush()
+        const json = typeof data === "string" ? data : JSON.stringify(data);
+        const message = json.endsWith("\n") ? json : json + "\n";
+        socket.write(message);
+        socket.flush();
     }
 
     function _scheduleReconnect() {
-        const pow = Math.min(_reconnectAttempt, 10)
-        const base = Math.min(reconnectBaseMs * Math.pow(2, pow), reconnectMaxMs)
-        const jitter = Math.floor(Math.random() * Math.floor(base / 4))
-        reconnectTimer.interval = base + jitter
-        reconnectTimer.restart()
-        _reconnectAttempt++
+        const pow = Math.min(_reconnectAttempt, 10);
+        const base = Math.min(reconnectBaseMs * Math.pow(2, pow), reconnectMaxMs);
+        const jitter = Math.floor(Math.random() * Math.floor(base / 4));
+        reconnectTimer.interval = base + jitter;
+        reconnectTimer.restart();
+        _reconnectAttempt++;
     }
 }

quickshell/Common/SettingsData.qml

@@ -182,6 +182,7 @@ Singleton {
 
     property int firstDayOfWeek: -1
     property bool showWeekNumber: false
+    property string calendarBackend: "auto"
     property bool use24HourClock: true
     property bool showSeconds: false
     property bool padHours12Hour: false

quickshell/Common/settings/SettingsSpec.js

@@ -37,6 +37,7 @@ var SPEC = {
 
     firstDayOfWeek: { def: -1 },
     showWeekNumber: { def: false },
+    calendarBackend: { def: "auto" },
     use24HourClock: { def: true },
     showSeconds: { def: false },
     padHours12Hour: { def: false },