Who're /ˈhuː.ɚ/ (US), /ˈhuː.ə(r)/ (UK) is the contracted spelling of who are. Within the contraction, the unstressed are is reduced so that only its final /r/ survives in fast speech.
Who're /hʊr/ is the contraction of who are: unstressed are reduces to just /r/.
Who're you texting? In fast speech the /h/ plus /r/ can collapse toward one syllable, approaching were /wɜːr/. In writing, whose /huːz/ is the possessive, spelled differently.
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Who had contracts to who'd, pronounced /huːd/.
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who's /huːz/, contraction of who has (also who is), homophone of possessive whose
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The contraction of is is 's, pronounced /z/ or /s/ depending on the sound before it, attached to the preceding word.
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A situational usage guide: when who're fits, with condition-first sentences grouped by reader situation, plus one qualifier that changes the decision.
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*you're* /jɔːr/ (BrE also /jʊə/) is the contraction of *you are* /juː ɑː(r)/. The apostrophe replaces the letters *a* and *r* of 'are', and in fast speech the vowel reduces from /uː/ to /ə/, which is why it can sound identical to 'your'.
