fix(analytics): include minutes for time-based set volume stats

[evan188199-tech]

What

Per-exercise volume statistics (/api/exercises/[id]/statistics/volume) dropped the minutes for time-based sets and read from the wrong array index, so time-based exercises got wildly wrong volume numbers — a 3:00 plank showed 0 volume while a 0:30 plank showed 30.

This is a bug I found while auditing the analytics code (not covered by any existing issue/PR).

Root cause

A TIME column stores two values at the same column index (see workout-session-set.tsx):

• valuesInt[columnIndex] = minutes
• valuesSec[columnIndex] = seconds

The volume route read time-based sets like this:

} else if (timeIndex !== -1 && set.valuesSec && set.valuesSec[0]) {
  volume = set.valuesSec[0];
}

Two problems:

1. Hardcoded valuesSec[0] — wrong when TIME isn't the first column (types: ["REPS","TIME"] keeps seconds at valuesSec[1]).
2. Minutes ignored entirely. A 3:00 plank (valuesInt:[3], valuesSec:[0]) hit the falsy set.valuesSec[0] guard and was skipped (volume = 0), while a 0:30 plank got volume = 30.

Fix

} else if (timeIndex !== -1 && (set.valuesInt || set.valuesSec)) {
  const minutes = set.valuesInt?.[timeIndex] ?? 0;
  const seconds = set.valuesSec?.[timeIndex] ?? 0;
  volume = minutes * 60 + seconds;
}

Reads from timeIndex (not a hardcoded 0), adds the minutes back in, and uses a non-falsy guard so a whole-minute entry isn't dropped. The downstream volume > 0 check still correctly skips genuinely-empty entries (0 min + 0 sec).

Fixes #222.

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[evan188199-tech]

此 PR 由 GLM-5.2 修复。