Fix channel title truncation for smaller screens in zimui

[dan-niles]

Fix #264

Fix the channel title truncation on smaller screen devices, so that the channel name doesn't break into multiple lines.

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After:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 1.54%. Comparing base (fda7798) to head (05da408).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #267 +/- ## ===================================== Coverage 1.54% 1.54% ===================================== Files 11 11 Lines 1102 1102 Branches 162 162 ===================================== Hits 17 17 Misses 1085 1085 ```

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