fix(session-ui): show dates in message timestamps - #45590

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Hi Abdul535 — your PR was closed by the automated PR cleanup bot, not by a
review decision: it was created more than a month ago and had fewer than 2
positive reactions. The feature itself is exactly what's still missing.

Could you reopen it? I'd also be happy to test it on Windows / OpenCode
Desktop 1.19.3 and report back. I added a 👍 so it doesn't get cleaned up
again.

For context: the same request is tracked in #44588, and #58034 asks for the
same thing as a configurable format. If the project prefers a setting over a
fixed format, that would work too — the important part is having the date
there at all.