The unread indicator dot was absolutely positioned at `left-1` (4px), leaving
only ~4px between it and the avatar (which starts at the row's `px-4` gutter),
so the dot read as flush against the avatar. Move it to `left-0.5` so it sits
nearer the panel edge (like other mail clients) and opens the dot-to-avatar gap
to ~6px. Applied to both email-list-item and thread-list-item (all three
absolute dot instances).
