feat(qs): add a 'New event' Quick Settings tile

A stateless TileService that opens the create-event form on today — the same
action as the launcher 'New event' shortcut and the agenda widget's +. Reuses
MainActivity.openCreateIntent; wrapped in unlockAndRun and using the API 34+
startActivityAndCollapse(PendingIntent) form (deprecated Intent form below 34).
No new permission (BIND_QUICK_SETTINGS_TILE is system-side).

Discoverability: Settings → New event form gains an 'Add Quick Settings tile'
row that fires StatusBarManager.requestAddTileService (API 33+); on older
versions the tile is still addable manually from the system QS editor.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/java/de/jeanlucmakiola/calendula/qs/NewEventTileService.kt

@@ -0,0 +1,41 @@
+package de.jeanlucmakiola.calendula.qs
+
+import android.app.PendingIntent
+import android.os.Build
+import android.service.quicksettings.TileService
+import de.jeanlucmakiola.calendula.MainActivity
+import kotlinx.datetime.TimeZone
+import kotlinx.datetime.toLocalDateTime
+import kotlin.time.Clock
+
+/**
+ * Quick Settings tile: tapping it opens the create-event form on today — the
+ * same action as the launcher "New event" shortcut and the agenda widget's "+".
+ * A stateless action tile, so there is no on/off state to keep in sync.
+ */
+class NewEventTileService : TileService() {
+
+    override fun onClick() {
+        super.onClick()
+        val today = Clock.System.now()
+            .toLocalDateTime(TimeZone.currentSystemDefault()).date
+        val intent = MainActivity.openCreateIntent(this, today)
+        // Launch only once the device is unlocked: creating an event behind the
+        // keyguard makes no sense, and the shade can't start an activity over a
+        // locked screen anyway.
+        unlockAndRun {
+            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.UPSIDE_DOWN_CAKE) {
+                val pending = PendingIntent.getActivity(
+                    this,
+                    0,
+                    intent,
+                    PendingIntent.FLAG_IMMUTABLE or PendingIntent.FLAG_UPDATE_CURRENT,
+                )
+                startActivityAndCollapse(pending)
+            } else {
+                @Suppress("DEPRECATION")
+                startActivityAndCollapse(intent)
+            }
+        }
+    }
+}

app/src/main/java/de/jeanlucmakiola/calendula/ui/settings/SettingsScreen.kt

@@ -1,12 +1,16 @@
 package de.jeanlucmakiola.calendula.ui.settings
 
 import android.Manifest
+import android.app.StatusBarManager
+import android.content.ComponentName
 import android.content.Context
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.graphics.drawable.Icon
 import android.os.Build
 import android.os.PowerManager
 import android.provider.Settings
+import androidx.annotation.RequiresApi
 import android.text.format.DateFormat
 import androidx.activity.compose.rememberLauncherForActivityResult
 import androidx.activity.result.contract.ActivityResultContracts
@@ -80,6 +84,7 @@ import de.jeanlucmakiola.calendula.data.prefs.CalendarReminderOverride
 import de.jeanlucmakiola.calendula.data.prefs.ThemeMode
 import de.jeanlucmakiola.calendula.data.prefs.WeekStartPref
 import de.jeanlucmakiola.calendula.domain.EventFormField
+import de.jeanlucmakiola.calendula.qs.NewEventTileService
 import de.jeanlucmakiola.calendula.ui.crash.CrashReportDialog
 import de.jeanlucmakiola.calendula.ui.crash.openIssueTracker
 import de.jeanlucmakiola.calendula.ui.crash.submitCrashReport
@@ -514,9 +519,39 @@ private fun EventFormScreen(
                 )
             },
         )
+
+        // One-tap add of the "New event" Quick Settings tile. The system prompt
+        // is API 33+; on older versions the tile is still addable manually from
+        // the QS editor, so the row simply doesn't appear there.
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            Spacer(Modifier.height(24.dp))
+            val context = LocalContext.current
+            GroupedRow(
+                title = stringResource(R.string.settings_qs_tile),
+                summary = stringResource(R.string.settings_qs_tile_hint),
+                position = Position.Alone,
+                onClick = { requestAddQsTile(context) },
+            )
+        }
     }
 }
 
+/**
+ * Ask the system to add the "New event" Quick Settings tile (API 33+). The OS
+ * shows its own confirmation dialog and handles the already-added case, so no
+ * result handling is needed here.
+ */
+@RequiresApi(Build.VERSION_CODES.TIRAMISU)
+private fun requestAddQsTile(context: Context) {
+    val statusBar = context.getSystemService(StatusBarManager::class.java) ?: return
+    statusBar.requestAddTileService(
+        ComponentName(context, NewEventTileService::class.java),
+        context.getString(R.string.qs_tile_new_event_label),
+        Icon.createWithResource(context, R.drawable.ic_qs_new_event),
+        context.mainExecutor,
+    ) { /* result code unused — the system surfaces its own feedback */ }
+}
+
 /**
  * Reminder-notifications toggle (v1.4), mirroring the onboarding step.
  * Turning it on re-requests `POST_NOTIFICATIONS` when missing (API 33+) —