fix: convert workout timestamps to local timezone

[fencerJP]

Problem

Hevy API returns start_time as UTC (Z-suffixed ISO-8601, e.g. "2026-08-31T09:57:17Z"). Go's time.Parse sets Location = UTC for these strings, so every .Format() call outputs UTC — resulting in workout times displayed 9 hours behind for JST users.

Fix

Added .Local() before each .Format() call on w.StartTime to convert to the host system's timezone.

Files changed

File	Line	Change
cmd/workout/list.go	123	Date column in workout list
cmd/workout/get.go	107	Full datetime in workout get <id>
cmd/workout/get.go	61	TUI picker subtitle (interactive workout selection)

Testing notes

• .Local() is a no-op if the host timezone is UTC — safe for all users.
• No Go compiler available on my test machine, but the change is trivially correct: .Local() returns a time.Time with the host's location, then .Format() uses that location.

[coderabbitai]

Important

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Run ID: 0f52bed2-754a-4186-89d3-ac299a7caf0c

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