mac: the stage is a panel on the window ground

[stupart]

§3: "the stage is a surface panel inset 8 from the window, radius 12 (ConchRadius.medium), with a 0.5 pt hairline shadow. No other cards." The lab's #stage gives it in values:

#stage{ top:8px; right:8px; bottom:8px; left:var(--sideW);
        background:var(--surface); border-radius:12px;
        box-shadow:var(--shPanel); overflow:hidden }
--shPanel: 0 0 0 .5px rgba(0,0,0,.08), 0 1px 3px rgba(0,0,0,.04);

The pane was flush with the window and divided from the sidebar by a 1 pt rule. Now it is a panel: inset 8 on all four sides so the ground shows through, surface, radius 12, a 0.5 hairline ring, and a very quiet drop. The sidebar's rule is gone — #stage has no left border, and the panel's own edge is the separation.

The drop comes from .conchElevation(.raised) (radius 1.5, y 1), not .floating (14, y 10). The composer floats; the stage merely sits. No ConchElevation case carries a ring, so it's drawn explicitly — the same way the composer does it, rather than inventing a token for one use.

Right shape, wrong fill

The first build had the panel's geometry and the window ground inside it — because the transcript, the pane body, the 52 pt header and every deliverable surface painted ConchPalette.bg over the panel's surface. In light that's #F2F1EF over #FFFFFF: a panel-shaped hole. I only caught it by photographing it.

So the sweep: ConversationStackView's scroll ground, ConversationPane's body, sessionBar, and all 13 ground references in ReviewView — which renders only inside the stage since #284 deleted the full-window overlay. That includes the cover which hides WKWebView's white flash: left as ground, it would itself be a visible rectangle against the panel.

Three ground fills remain, all outside the panel: the window, the title strip, and the ledger — which is what the panel sits on.

Guards

mutation	result
the panel loses its inset and fills the window	1 fail
the panel takes the composer's float instead of the stage's quiet drop	1 fail
the surface fill goes back to the window ground	1 fail
the hairline ring is dropped	1 fail
the sidebar's 1 pt rule comes back beside the panel	1 fail
a ground fill creeps back inside the pane	1 fail
one deliverable surface reverts to the ground	1 fail
the transcript paints the ground over the panel	1 fail

The "nothing inside the pane paints the ground" invariant is asserted structurally, not as a count, so it survives a refactor that moves a fill around.

Gate

bun test 2304/0 exit 0 · tsc --noEmit exit 0 · Mac xcodebuild BUILD SUCCEEDED · iOS xcodebuild BUILD SUCCEEDED · photographed on the real window, twice — once to find the wrong fill, once to confirm it.

Not here

The lab has no 🐚 wordmark strip: §5 drops it, with traffic lights over the sidebar and the panel starting 8 from the window top. That's the header slice (breadcrumb, state text, terminal and details buttons) and it's next.

🤖 Generated with Claude Code

https://claude.ai/code/session_01SfEX6bfwCGXtThk1JRNmsE