feat(notify): make the queue and history caps settable

A lowered cap applies at the next add rather than at once, so reloading
the config never drops a notification the user has not seen.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/internal/notify/store_test.go b/internal/notify/store_test.go
index 13f78dc..cc351be 100644
--- a/internal/notify/store_test.go
+++ b/internal/notify/store_test.go
@@ -164,3 +164,26 @@ func TestStoreRemovesImageOnReplace(t *testing.T) {
 		t.Fatalf("replace removed %v", removed)
 	}
 }
+
+func TestSetCapsAppliesAtNextAdd(t *testing.T) {
+	s, _ := newTestStore()
+	for i := 0; i < 5; i++ {
+		id, _ := s.Add(popup("a"), "", 0)
+		s.Dismiss(id, 2)
+	}
+	for i := 0; i < 4; i++ {
+		s.Add(popup("a"), "", 0)
+	}
+	s.SetCaps(2, 3)
+	// Lowering a cap drops nothing by itself.
+	if got := len(s.historySnapshot()); got != 5 {
+		t.Fatalf("history after SetCaps = %d, want 5", got)
+	}
+	s.Add(popup("a"), "", 0)
+	if got := len(s.order); got != 2 {
+		t.Errorf("live = %d, want 2", got)
+	}
+	if got := len(s.historySnapshot()); got != 3 {
+		t.Errorf("history = %d, want 3", got)
+	}
+}