Polish message author labels

[SuuBro]

Summary

• align prompt-author badges with the approved mock, including neutral initials and centered accessory-bearing agent sprites
• make resolvable agent labels link to their originating session
• remove duplicate restart-prompt attribution
• pin badge sizing, clipping, mobile geometry, sprite alignment, and navigation coverage

Tests

• npm run check
• npm run test:unit — 968 files passed, 4 skipped; 8,438 tests passed, 26 skipped
• npm run test:browser — 672 passed, 9 skipped; browser budget passed
• npm run test:e2e — all four phases passed; Docker unavailable, so the Docker-gated sandbox path self-skipped

🤖 Generated with Bobbit

[greptile-apps]

Greptile Summary

Polish message-author presentation and attribution behavior.

• Add neutral initials and revised badge geometry for user and system prompts.
• Center static agent sprites and link resolvable agent labels to their originating sessions.
• Remove duplicate system attribution from restart continuation prompts.
• Expand DOM, browser, sprite, and prompt-lifecycle coverage.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failures remain.

Important Files Changed

Filename	Overview
src/ui/components/Messages.ts	Renders revised author badges and links agent badges when an originating session is resolvable.
src/ui/bobbit-render.ts	Adds opt-in centering for static author sprites while preserving sidebar alignment behavior.
src/ui/app.css	Updates author badge sizing, clipping, alignment, initials, and interactive link states.
src/server/agent/session-manager.ts	Removes redundant inline system attribution from restart continuation text.

_{Reviews (4): Last reviewed commit: "Polish message author labels" | Re-trigger Greptile}

[SuuBro]

@greptileai