fix(maps): include seconds in timezone UTC offset output

[teknium1]

Salvage of #15086 by @0z1-ghb onto current main. Authorship preserved via cherry-pick + rebase-merge.

Summary

Maps timezone command now includes seconds in the UTC offset string when timeapi.io reports a non-zero seconds field. Previously the currentUtcOffset path extracted seconds but discarded it, and the standardUtcOffset path didn't read it at all.

Changes

• skills/productivity/maps/scripts/maps_client.py: append :SS to utc_offset when seconds != 0, on both currentUtcOffset and standardUtcOffset code paths.

Validation

offset_info	output
hours=5, minutes=30, seconds=0	+05:30
hours=5, minutes=30, seconds=45	+05:30:45
hours=-8, minutes=0, seconds=0	-08:00

Closes #15086.