feat(comments): dim read-only comments so they read as disabled

A comment you can't edit only had a grey heading, and the grey (`shadow`) was light enough to blend with the body text of your own comments. Now the read-only overlay covers the whole comment subtree, heading and body, so the comment recedes as a unit. And `pearl-readonly-comment` uses a darker background-aware grey (gray40 on a dark theme, gray60 on light, `shadow` as the fallback). Editable comments keep the heading-only overlay so your own comment text stays normal-colored, with the green heading as the "this one's yours" cue.

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