fix: coerce string timespan in converttimeunit

[kushals256]

fixes #41761

editroominfo calls mstotimeunit with the retention ttl from usesetting. on some installs that value comes back as a string like 63072000000.0, which made isfinitetimespan fail and the channel settings form crash.

normalize timespan with number() before validation in converttimeunit. added a unit test for the reported string value.

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