feat: timeline performance (#16446)

* Squash - feature complete

* remove need to init assetstore

* More optimizations. No need to init. Fix tests

* lint

* add missing selector for e2e

* e2e selectors again

* Update: fully reactive store, some transitions, bugfixes

* merge fallout

* Test fallout

* safari quirk

* security

* lint

* lint

* Bug fixes

* lint/format

* accidental commit

* lock

* null check, more throttle

* revert long duration

* Fix intersection bounds

* Fix bugs in intersection calculation

* lint, tweak scrubber ui a tiny bit

* bugfix - deselecting asset doesnt work

* fix not loading bucket, scroll off-by-1 error, jsdoc, naming

web/src/app.css

@@ -135,32 +135,13 @@ input:focus-visible {
   }
 
   /* width */
-  .immich-scrollbar::-webkit-scrollbar {
-    width: 8px;
-  }
-
-  /* Track */
-  .immich-scrollbar::-webkit-scrollbar-track {
-    background: #f1f1f1;
-    border-radius: 16px;
-  }
-
-  /* Handle */
-  .immich-scrollbar::-webkit-scrollbar-thumb {
-    background: rgba(85, 86, 87, 0.408);
-    border-radius: 16px;
-  }
-
-  /* Handle on hover */
-  .immich-scrollbar::-webkit-scrollbar-thumb:hover {
-    background: #4250afad;
-    border-radius: 16px;
+  .immich-scrollbar {
+    scrollbar-width: thin;
   }
 
   /* Hidden scrollbar */
   /* width */
-  .scrollbar-hidden::-webkit-scrollbar {
-    display: none;
+  .scrollbar-hidden {
     scrollbar-width: none;
   }