Fix DM unread dot layering

[raymondjacobson]

Summary

• raise the compact DM unread indicator above the profile image layer
• keep the existing compact DM layout unchanged

Verification

• git diff --check
• stylelint not run locally: node_modules are not installed in this worktree, and npx tried to fetch a newer Stylelint dependency that npm rejected under the date-pinned install window

[changeset-bot]

⚠️ No Changeset found

Latest commit: fe49f85

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