feat(plan): grid component with sticky headers and weekend tint

src/admin/plan.css

@@ -0,0 +1,125 @@
+/* === Plán prací (work schedule) module === */
+
+.plan-grid-wrap {
+  overflow: auto;
+  border: 1px solid var(--border, #e5e7eb);
+  border-radius: 8px;
+  max-height: calc(100vh - 240px);
+}
+
+.plan-grid {
+  border-collapse: separate;
+  border-spacing: 0;
+  width: 100%;
+  font-size: 13px;
+}
+
+.plan-grid thead th {
+  position: sticky;
+  top: 0;
+  background: var(--bg-secondary, #f9fafb);
+  z-index: 2;
+  padding: 8px;
+  border-bottom: 1px solid var(--border, #e5e7eb);
+  text-align: left;
+  font-weight: 600;
+  white-space: nowrap;
+}
+
+.plan-grid thead th.plan-grid-date-col {
+  left: 0;
+  z-index: 3;
+  min-width: 110px;
+}
+
+.plan-grid tbody td {
+  padding: 6px 8px;
+  border-bottom: 1px solid var(--border, #e5e7eb);
+  vertical-align: top;
+  min-width: 140px;
+}
+
+.plan-grid tbody td.plan-grid-date-col {
+  position: sticky;
+  left: 0;
+  background: var(--bg-secondary, #f9fafb);
+  z-index: 1;
+  font-weight: 500;
+  color: var(--text-muted, #6b7280);
+  white-space: nowrap;
+}
+
+.plan-grid tr.plan-grid-weekend td {
+  background: var(--bg-weekend, #fefce8);
+}
+.plan-grid tr.plan-grid-weekend td.plan-grid-date-col {
+  background: var(--bg-weekend-strong, #fef3c7);
+}
+
+.plan-cell {
+  display: block;
+  width: 100%;
+  text-align: left;
+  background: transparent;
+  border: 1px dashed transparent;
+  border-radius: 6px;
+  padding: 4px 6px;
+  cursor: pointer;
+  min-height: 40px;
+}
+.plan-cell:hover {
+  border-color: var(--primary, #2563eb);
+}
+.plan-cell--readonly {
+  cursor: default;
+}
+.plan-cell--readonly:hover {
+  border-color: transparent;
+}
+
+.plan-chip {
+  display: inline-block;
+  border-radius: 4px;
+  padding: 2px 6px;
+  font-size: 12px;
+  font-weight: 500;
+  color: #1f2937;
+  background: var(--chip-default, #e5e7eb);
+}
+.plan-chip--work {
+  background: #dbeafe;
+}
+.plan-chip--preparation {
+  background: #ccfbf1;
+}
+.plan-chip--travel {
+  background: #fde68a;
+}
+.plan-chip--leave {
+  background: #bbf7d0;
+}
+.plan-chip--sick {
+  background: #fecaca;
+}
+.plan-chip--training {
+  background: #e9d5ff;
+}
+.plan-chip--other {
+  background: #e5e7eb;
+}
+
+.plan-cell-note {
+  display: block;
+  margin-top: 2px;
+  font-size: 11px;
+  color: var(--text-muted, #6b7280);
+  line-height: 1.3;
+}
+
+.plan-toolbar {
+  display: flex;
+  gap: 12px;
+  align-items: center;
+  margin-bottom: 12px;
+  flex-wrap: wrap;
+}