Shorter clock strings: "6 Days 3 Hours" -> "6d 3h"

[benjaminpjones]

This is an attempt to prevent wraparound in narrow contexts, which can cause layout issues in the player cards on the Game page. See discussion/poll at OGF: Should time control show days without hours?

To summarize, the "6d 3h" format the overwhelming preference (93%) in the multiple choice poll. One user cited precision as a reason for choosing this over an option like "6 Days" that keeps long-form units, but drops hours. Another user pointed out that the Sente Android app uses this format.

Proposed Changes

I've broken this into four commits:

• One basic component test (~66% coverage of the file)
• In depth test of prettyTime() (100% coverage of the function)
• Clean up prettyTime() a bit (no functional changes)
• Change the output for days > 1 && hours > 0

Screenshots

Notice, we get one line of vertical space back on both the player cards and the active games list. This is critical for phone screens!

[github-actions[bot]]

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[anoek]

Awesome, thanks for checking in with the community. 93% approval has got to be a record :)