feat: menu contextuel et selection type Excel dans la grille XLSX #155

frontend/style.css

@@ -11148,7 +11148,8 @@ body.desktop-mode .editor-container {
   border-bottom: 2px solid var(--grid-border);
 }
 .xlsx-table td[contenteditable] {
-  cursor: text;
+  /* #155 — Excel-style cross cursor over the cells. */
+  cursor: cell;
   min-width: 40px;
   white-space: pre-wrap;
 }
@@ -11473,6 +11474,55 @@ body.desktop-mode .editor-container {
   background: var(--border);
 }
 
+/* #155 — Excel-like range selection + right-click / long-press context menu. */
+.xlsx-table tbody td.xlsx-selected {
+  background: var(--accent-bg);
+}
+.xlsx-viewer.xlsx-selecting,
+.xlsx-viewer.xlsx-selecting td {
+  user-select: none;
+}
+.xlsx-viewer.xlsx-selecting td[contenteditable] {
+  cursor: crosshair;
+}
+.xlsx-context-menu {
+  position: fixed;
+  z-index: 10050;
+  display: flex;
+  flex-direction: column;
+  min-width: 220px;
+  padding: 6px;
+  border: 1px solid var(--border);
+  border-radius: 8px;
+  background: var(--surface);
+  box-shadow: 0 12px 32px var(--shadow, rgba(0, 0, 0, 0.35));
+}
+.xlsx-context-item {
+  text-align: left;
+  border: none;
+  background: transparent;
+  color: var(--text-primary);
+  border-radius: 4px;
+  padding: 6px 10px;
+  font-size: 0.82rem;
+  cursor: pointer;
+}
+.xlsx-context-item:hover:not(:disabled) {
+  background: var(--bg-hover);
+}
+.xlsx-context-item:disabled {
+  opacity: 0.5;
+  cursor: default;
+}
+.xlsx-context-danger {
+  color: var(--danger);
+}
+.xlsx-context-sep {
+  height: 1px;
+  margin: 4px 0;
+  background: var(--border);
+}
+
 /* JSDOM shims for the tests that click anchors */
 mark {
   font: inherit;