Integration: residence invite accept/decline APIs + wire notification actions

Adds acceptResidenceInvite / declineResidenceInvite to ResidenceApi
(POST /api/residences/{id}/invite/{accept|decline}) and exposes them via
APILayer. On accept success, myResidences is force-refreshed so the
newly-joined residence appears without a manual pull.

Wires NotificationActionReceiver's ACCEPT_INVITE / DECLINE_INVITE
handlers to the new APILayer calls, replacing the log-only TODOs left
behind by P4 Stream O. Notifications are now cleared only on API
success so a failed accept stays actionable.

Tests:
 - ResidenceApiInviteTest covers correct HTTP method/path + error surfacing.
 - NotificationActionReceiverTest invite cases updated to assert the new
   APILayer calls (were previously asserting the log-only path).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

composeApp/src/androidUnitTest/kotlin/com/tt/honeyDue/notifications/NotificationActionReceiverTest.kt

@@ -243,12 +243,14 @@ class NotificationActionReceiverTest {
         scope.cancel()
     }
 
-    // ---------- 5. ACCEPT_INVITE: clears notification (TODO: API call) ----------
+    // ---------- 5. ACCEPT_INVITE: calls APILayer + clears notification ----------
 
     @Test
     fun acceptInvite_withResidenceId_cancelsNotification() = runTest {
         val scope = CoroutineScope(SupervisorJob() + Dispatchers.Unconfined)
 
+        coEvery { APILayer.acceptResidenceInvite(any()) } returns ApiResult.Success(Unit)
+
         val notifId = 9005
         postDummyNotification(notifId)
 
@@ -259,10 +261,7 @@ class NotificationActionReceiverTest {
         }
         receiverFor(scope).onReceive(context, intent)
 
-        // API method does not yet exist — see TODO in receiver. Expectation is
-        // that the notification is still cleared (best-effort UX) and we did
-        // NOT crash. APILayer.createTaskCompletion should NOT have been called.
-        coVerify(exactly = 0) { APILayer.createTaskCompletion(any()) }
+        coVerify(exactly = 1) { APILayer.acceptResidenceInvite(101) }
         assertFalse(
             "invite notification should be cleared on accept",
             notificationManager.activeNotifications.any { it.id == notifId }
@@ -343,6 +342,8 @@ class NotificationActionReceiverTest {
     fun declineInvite_withResidenceId_cancelsNotification() = runTest {
         val scope = CoroutineScope(SupervisorJob() + Dispatchers.Unconfined)
 
+        coEvery { APILayer.declineResidenceInvite(any()) } returns ApiResult.Success(Unit)
+
         val notifId = 9009
         postDummyNotification(notifId)
 
@@ -353,6 +354,7 @@ class NotificationActionReceiverTest {
         }
         receiverFor(scope).onReceive(context, intent)
 
+        coVerify(exactly = 1) { APILayer.declineResidenceInvite(77) }
         assertFalse(
             "invite notification should be cleared on decline",
             notificationManager.activeNotifications.any { it.id == notifId }