fix(format): round human duration totals to the nearest minute (#710)

* fix(format): round human duration totals to the nearest minute

The Phase L dedup refactor folded the old `formatAlbumDuration` helper
into `formatHumanHoursMinutes`, but the shared version truncated seconds
to whole minutes instead of rounding. Aggregate duration labels (album,
playlist, total playtime) could read up to ~59 s short and flip the
hour boundary the wrong way — a 59:30 total showed "59 m" instead of
"1 h 0 m".

Restore the round-to-nearest-minute behaviour (and the negative-input
clamp) the helper had before the consolidation. Adds a test pinning the
rounding and the hour-boundary roll-up so it can't regress again.

* docs(changelog): add human-duration rounding fix under Fixed (#710)

CHANGELOG.md

@@ -284,6 +284,12 @@ Foundational work: faster reviews, narrower diffs, and a safety net under the pa
 
 ## Fixed
 
+### Statistics / playlists — duration totals rounded to the nearest minute again
+
+**By [@Psychotoxical](https://github.com/Psychotoxical), PR [#710](https://github.com/Psychotoxical/psysonic/pull/710)**
+
+* Aggregate duration labels (album and playlist totals, total playtime in **Statistics**) could read up to ~59 s short and round the wrong way at the hour boundary — a 59:30 total showed **"59 m"** instead of **"1 h 0 m"**. A `format` helper consolidation had switched the shared formatter from rounding to truncating; the round-to-nearest-minute behaviour is restored.
+
 ### Artists — infinite scroll after first page
 
 **By [@cucadmuh](https://github.com/cucadmuh), PR [#709](https://github.com/Psychotoxical/psysonic/pull/709)**