test(coding-agent): stop the tray ttl case from depending on wall-clock luck

The label derives its ttl text from the clock, so a loaded machine lands a second past the four-minute mark and the exact string flips to `4m 1s`. Assert the ratio and the minute instead; the seconds are the clock's, not the view's.

4b747db5 parent 73ecb005 +6 −2
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