fix(ui): enrich link previews for uppercase URL schemes

[xsahil03x]

Summary

Fixes FLU-625 for the v9 release line. URLs with an uppercase scheme (e.g. HTTPS://example.com) were not enriched into link previews, while lowercase https:// worked.

The composer's URL regex already matched uppercase schemes, but the raw matched text was forwarded to client.enrichUrl(...) verbatim — so the /og endpoint received HTTPS://… and failed to enrich. The fix normalizes the scheme (via Uri.parse, which lowercases it) before enriching, so HTTPS:// behaves the same as https://.

Flutter counterpart to the React (#3226) and Angular (#734) fixes. v10 counterpart: #2843.

Scope

This fixes the composer link-preview enrichment path. Display-side linkification of uppercase schemes in rendered message text lives in stream_core_flutter and is out of scope here.

Testing

Added message_input_url_enrichment_test.dart — asserts enrichUrl is called with the normalized https://example.com for both uppercase and lowercase input. Fails before the fix, passes after.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (v9@d592483). Learn more about missing BASE report.

Additional details and impacted files

@@          Coverage Diff          @@
##             v9    #2844   +/-   ##
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  Coverage      ?   67.19%           
=====================================
  Files         ?      430           
  Lines         ?    27146           
  Branches      ?        0           
=====================================
  Hits          ?    18242           
  Misses        ?     8904           
  Partials      ?        0           

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