refactor(grille): remove relics from old background-based rendering model

print-color-adjust: exact was added to force browsers to print background-
color grid lines. Now that grid lines are CSS borders, which always print,
this property is redundant.

container-type: inline-size on section-rows was added to make cqi units
resolve correctly for bar sizing. Bars now use 100% of the row width
instead, so the container query context is no longer needed.

Author: nelstrom

packages/grigson-grille-harmonique-renderer/src/styles.ts

@@ -14,8 +14,6 @@ export function getGrilleStyles(typeface: string = 'sans'): string {
   return `
 /* ── Variables ── */
 [part~="chart"] {
-  -webkit-print-color-adjust: exact;
-  print-color-adjust: exact;
   --cg-grid-width: 2px;
   --cg-diag-width: 0.5px;
   --cg-diag-style: solid;
@@ -36,12 +34,9 @@ export function getGrilleStyles(typeface: string = 'sans'): string {
 }
 
 /* ── Section rows ── */
-/* No background here — the row carries its own background so incomplete
-   rows don't extend the coloured area into the empty trailing space. */
 [part~="section-rows"] {
   display: flex;
   flex-direction: column;
-  container-type: inline-size;
   flex: 1;
 }