chore(changelog): update CHANGELOG.md to reflect recent enhancements in unit tests and Backup Manager functionality

- Added entry for extended frontend unit tests covering plugin, backup, and settings components.
- Updated Backup Manager to ensure the "Created" column refreshes when date/time format preferences change.

CHANGELOG.md

@@ -25,6 +25,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - **Catch-up indicators in Channels and Streams tables.** Channels and streams with catch-up enabled show a grey history icon beside the name (tooltip includes archive days when known). Expanded channel stream rows show a catch-up badge. Channel and stream API serializers expose `is_catchup` and `catchup_days` for the UI. The Channels and Streams table filter menus include **Only Catch-up** to narrow each list to catch-up entries.
 - **Combined connection stats API.** `GET /proxy/stats/` (admin) returns live, VOD, and catch-up connection stats in one JSON response (`live`, `vod`, `catchup`, `timestamp`). The Stats page polls this endpoint instead of separate live and VOD stats requests.
 - **Frontend unit tests extended to table components.** `ChannelsTable`, `StreamsTable`, `M3UsTable`, `EPGsTable`, `LogosTable`, `CustomTable`, and related header/editable subcomponents now have Vitest + Testing Library suites. Table business logic was extracted into `frontend/src/utils/tables/*` (with shared `M3uTableUtils` for M3U/EPG sort headers) and covered by dedicated util tests. `dateTimeUtils.formatDuration` gained a `human` precision mode for readable content lengths. — Thanks [@nick4810](https://github.com/nick4810)
+- **Frontend unit tests extended to plugin, backup, and settings components.** `AboutModal`, `PluginDetailPanel`, `BackupManager`, `AvailablePluginCard`, `ConnectionSecurityPanel`, and `UserLimitsForm` were refactored with business logic moved into `frontend/src/utils/components/*` and `PluginsUtils`; `pluginUtils` (version comparison, compatibility labels, install/downgrade detection) now lives under `utils/components/`. Vitest + Testing Library suites were added for those components plus `PluginWarnings` and `EpgSettingsForm`. — Thanks [@nick4810](https://github.com/nick4810)
 
 ### Changed
 
@@ -64,6 +65,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Live proxy failover now walks backup streams in channel order.** After a stable session on a backup stream, `tried_stream_ids` is cleared so rotation continues from the current position (stream 2 → 3 → 4 → 1) instead of jumping back to stream 1. `get_alternate_streams()` returns alternates in that rotated order, matching the manual next-stream API.
 - **Live proxy preview no longer 500s when joining an active channel on a non-owner worker.** `stream_ts()` now pre-registers the client before `ensure_output_profile()` (the same watchdog protection owners already had), so the non-owner cleanup thread no longer tears down `client_manager` while output-profile transcode is still starting. Failed setup paths remove the client again and return 503 instead of an unhandled `KeyError`.
 - **Backend test suite reliability.** `dispatcharr.settings_test` creates `test_dispatcharr` as UTF-8 (`template0`) so EPG programme indexes and Unicode XMLTV data round-trip correctly. Tests were updated for DOCTYPE-based HTML entity resolution, EPG name-normalization expectations, migration 0037 unit invocation, Schedules Direct mocks, and other areas; full app test modules are discoverable when listed explicitly (bare `manage.py test` still only runs `core.tests` and top-level `tests/`).
+- **Backup Manager "Created" column now updates when date/time format preferences change.** The table column definitions were memoized with an empty dependency array while closing over `fullDateTimeFormat`, so changing display preferences did not refresh backup timestamps until the page was reloaded.
 
 ## [0.27.2] - 2026-06-30
 

frontend/src/components/backups/BackupManager.jsx

@@ -177,7 +177,7 @@ export default function BackupManager() {
         size: 100,
       },
     ],
-    []
+    [fullDateTimeFormat]
   );
 
   const renderHeaderCell = (header) => {