perf: improve filter generation performance

for some reason the filter here was taking ~6ms to create...

Signed-off-by: kernelkind <kernelkind@gmail.com>

crates/notedeck_columns/src/timeline/kind.rs

@@ -626,11 +626,15 @@ impl TimelineKind {
 pub fn notifications_filter(pk: &Pubkey) -> Filter {
     Filter::new()
         .pubkeys([pk.bytes()])
-        .kinds([1, 7, 6])
+        .kinds(notification_kinds())
         .limit(default_limit())
         .build()
 }
 
+pub fn notification_kinds() -> [u64; 3] {
+    [1, 7, 6]
+}
+
 #[derive(Debug)]
 pub struct TitleNeedsDb<'a> {
     kind: &'a TimelineKind,

crates/notedeck_columns/src/toolbar.rs

@@ -25,8 +25,12 @@ pub fn unseen_notification(
         profiling::scope!("NotesFreshness::update closure");
         let filter = {
             profiling::scope!("NotesFreshness::update filter instantiation");
-            crate::timeline::kind::notifications_filter(&current_pk)
-                .since_mut(timestamp_last_viewed)
+            enostr::Filter::new_with_capacity(1)
+                .pubkeys([current_pk.bytes()])
+                .kinds(crate::timeline::kind::notification_kinds())
+                .limit(1)
+                .since(timestamp_last_viewed)
+                .build()
         };
         let txn = Transaction::new(ndb).expect("txn");