The chat composer reused .miu-textarea, which the INBOX MAIL composer already
owned further down the stylesheet with `resize: vertical; min-height: 90px`.
Equal specificity, later rule wins — so the mail styling applied to the chat box:
90px tall with a resize grabber, and every height fix in 0.1.10–0.1.12 was
silently overridden. That is why the box never changed.
The composer now uses its own .miu-composer-box; the inbox rule is untouched.
Adds a regression test asserting the composer does not carry .miu-textarea.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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