[pratikbuilds]

Summary

The conversation, day divider, and input share a centered column capped at 1200px when side panels are closed. Opening Replies, the bench drawer, or both keeps the input 16px from the nearest panel. User bubbles retain their 16px inset. The desktop drawer is a flat side panel with one divider, avoiding a nested card surface.

- Uneven conversation/input widths and large gaps beside side panels
+ Centered conversation, with a 16px input gap beside an open panel
- Floating drawer card nested inside the main sheet
+ Flat details panel with one divider

Fixes #1109.

Evidence

Conversation alignment — the timeline, divider, and input now share one centered column. Before is the original issue screenshot; after is the current local preview.

Before	After

Replies spacing — the large empty gap beside Replies is replaced by a 16px input inset. User bubbles keep their inset. These close-ups show the reported gap and the final layout; full after screenshot.

Before	After

Details drawer — the input gap drops from 81.5px to 16px. The nested rounded card becomes a flat panel with one continuous divider. Both screenshots use the same conversation and 2048px viewport.

Before	After

• Before: the Replies regression reproduces a 127px gap at 2048px; the details-only live preview measures an 81.5px gap. The drawer regression fails because its floating card is inset rather than flush with its column.
  After: bun test e2e/browser/zero-to-one.test.ts passes against a disposable Postgres database: 1 test, 466 assertions. Covers 390–2048px widths, 860/861px phone boundary, drawer and Replies toggles, both panels open, 16px/20px reserved scrollbar space, scrolling, prose width, and overflow. Mocked worker reply, follow-up, artifact creation, routine brief, and rename persistence pass; browser errors are empty.
• Live preview verifies the details-only input gap at 16px, a 1px drawer divider, and no nested card shadow or rounded edge.
• bun run build, typecheck, lint, formatting, and git diff --check pass.
• bun run check still fails on two existing packages with bun test scripts and no test files: @corbits/url-path and @corbits/workflows. DB-backed suites were checked separately with the browser command above; the root check ran without DATABASE_URL.

The merge resolution keeps main’s deletion of the standalone worker-reply suite and moves this PR’s layout checks into the consolidated zero-to-one flow. The CSS and design changes are unchanged.

Merge Danger

Door: two-way

CSS layout changes; no schema or runtime changes.

Blast Radius: layout

Conversation, input, side panel spacing, and bench drawer appearance. The phone drawer remains a full-width overlay.

[TheGreatAxios]

This is perfect -- aligning even better with the original mockups and spacing targets. LGTM