Updates `NostrClient.subscribeVideos` to buffer incoming events and invoke the `onVideo` callback once per flush cycle with an array of updates, instead of once per video. This significantly reduces redundant sorting, filtering, and persistence operations in `NostrService`.
Also optimizes `populateNip71MetadataForVideos` to run as a single batched request per flush cycle.
BREAKING CHANGE: `subscribeVideos` callback now receives `Video[]` instead of `Video`. All internal consumers have been updated.
Co-authored-by: PR0M3TH3AN <[email protected]>
- Updated `NostrClient.fetchListIncrementally` to accept a `since` override.
- Updated `HashtagPreferencesService.load` to pass `since` based on local cache timestamp.
- Ensures preferences are refreshed if local state is stale or missing, overriding potentially incorrect `SyncMetadataStore` state.
- Added regression tests for `fetchListIncrementally` since parameter logic.
Co-authored-by: PR0M3TH3AN <[email protected]>
