editor: residual flat chrome after #992 — drawer Project, quiet Author nav, page-like Source

[drawmeanelephant]

Maintainer dogfood on 63c2a604 (PR #994) — acceptance from this issue passes.

• Project is a recessed drawer (not twin equal-height card)
• Author nav: Project+Source prominent; Review destinations faint but live
• Source page material: no card elevation, focus-within, ~54rem measure
• Quieter header (Connected chip, Dark/Light, no eyebrow)
• Smokes: density persist, Save, Cancel a11y, gutter OK

Optional Review Source elevation not required to close.

Closing as completed after dogfood.