fix(link): hide pair/unpair modals when [hidden] is set
.link-modal unconditionally set `display: flex`, overriding the UA
stylesheet's `display: none` for the HTML `hidden` attribute. Both
modals rendered visible on page load and stayed visible after Cancel.
Add `.link-modal[hidden] { display: none; }`, mirroring the canonical
`.talent-view-modal[hidden]` idiom in convey/static/app.css. Regression
test asserts both rendered modals carry the `hidden` attribute and the
stylesheet carries the override rule.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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