Header band: one row of controls, 36px, aligned with the sidebar toggle

Owner report: the controls folded onto two rows (search+coverage /
import+gear) — the 2026-09-17 flex-wrap kicking in, plus a real bug: my
previous wave moved max-w-[calc(100%-9rem)] onto the shrink-wrapped
column wrapper, where the percentage reference broke and the wrap fired
far too early. Owner wants the controls to read as header content.

- The width cap moves to the absolute column itself (100% resolves
  against the full-bleed parent, as before): max-w-[calc(100%-5.5rem)].
- One row, NEVER wraps (owner rejected the two-row fold): search is the
  flexible element (w-56 + min-w-0, shrinks under the cap); the other
  controls are shrink-0.
- All controls slimmed into the header band: top-2 (8px) matching the
  header's py-2, 36px tall matching the toggle's h-9 — size-9 buttons,
  h-7 import button, px-1 py-[3px] containers (border included = 36).
- Cost number + pipeline pills stay below the band, unchanged.

components/graph-coverage.tsx

@@ -102,7 +102,7 @@ export function GraphCoverageControl({ refreshKey = 0 }: { refreshKey?: number }
 				title="Extraction coverage — what the knowledge graph has covered"
 				aria-expanded={open}
 				onClick={() => setOpen((o) => !o)}
-				className={`flex size-11 items-center justify-center rounded-xl border bg-card/85 shadow-lg backdrop-blur transition-colors hover:bg-accent ${
+				className={`flex size-9 items-center justify-center rounded-xl border bg-card/85 shadow-lg backdrop-blur transition-colors hover:bg-accent ${
 					open ? "text-foreground" : "text-muted-foreground hover:text-foreground"
 				}`}
 			>