feat(plan): grid renders up to 3 stacked records per cell

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/admin/components/PlanGrid.tsx

@@ -290,6 +290,17 @@ const PlanGridRoot = styled(Box)(({ theme }) => ({
   },
   "& .plan-cell--pulse": { animation: "plan-cell-pulse 600ms ease-out" },
 
+  "& .plan-cell-record": {
+    display: "block",
+    width: "100%",
+    minWidth: 0,
+  },
+  "& .plan-cell-record + .plan-cell-record": {
+    marginTop: 5,
+    paddingTop: 5,
+    borderTop: `1px dashed ${theme.vars!.palette.divider}`,
+  },
+
   // Chips inside a cell
   "& .plan-chip-block": {
     display: "flex",
@@ -373,11 +384,7 @@ interface Props {
   // the value so back-to-back mutations on the same cell re-trigger
   // the animation (React needs a new key to re-mount the class).
   pulseKey?: { userId: number; date: string; nonce: number } | null;
-  onCellClick: (
-    userId: number,
-    date: string,
-    cell: ResolvedCell | null,
-  ) => void;
+  onCellClick: (userId: number, date: string, cells: ResolvedCell[]) => void;
 }
 
 // Full Czech weekday names, indexed by Date.getUTCDay() (0 = Sunday).
@@ -572,29 +579,51 @@ export default function PlanGrid({
                               } as CSSProperties)
                             : undefined
                         }
-                        onClick={() => onCellClick(u.id, date, cell)}
+                        onClick={() => onCellClick(u.id, date, cellArr)}
                         aria-label={
                           cell
-                            ? `${u.full_name}, ${date}, ${planCategoryLabel(cell.category, catMap)}`
+                            ? cellArr.length === 1
+                              ? `${u.full_name}, ${date}, ${planCategoryLabel(cell.category, catMap)}`
+                              : `${u.full_name}, ${date}, ${cellArr.length} záznamy`
                             : isLocked
                               ? `${u.full_name}, ${date}, ${past ? "uplynulý den" : "prázdné"} — bez záznamu`
                               : `${u.full_name}, ${date}, prázdné — přidat záznam`
                         }
                       >
-                        <PlanRangeChips
-                          cell={cell}
-                          project={
-                            cell?.project_id
-                              ? (projects.find(
-                                  (p) => p.id === cell.project_id,
-                                ) ?? null)
-                              : null
-                          }
-                          readonly={!canEdit}
-                          categoryLabel={
-                            cell ? planCategoryLabel(cell.category, catMap) : ""
-                          }
-                        />
+                        {cellArr.map((c, i) => (
+                          <Box
+                            key={
+                              c.entryId != null
+                                ? c.entryId
+                                : c.overrideId != null
+                                  ? `o${c.overrideId}`
+                                  : i
+                            }
+                            className="plan-cell-record"
+                            style={
+                              {
+                                "--cat-color": catMap[c.category]?.color,
+                              } as CSSProperties
+                            }
+                          >
+                            <PlanRangeChips
+                              cell={c}
+                              project={
+                                c.project_id
+                                  ? (projects.find(
+                                      (p) => p.id === c.project_id,
+                                    ) ?? null)
+                                  : null
+                              }
+                              readonly={!canEdit}
+                              categoryLabel={planCategoryLabel(
+                                c.category,
+                                catMap,
+                              )}
+                              showNote={cellArr.length === 1}
+                            />
+                          </Box>
+                        ))}
                       </button>
                     </td>
                   );

src/admin/components/PlanRangeChips.tsx

@@ -6,6 +6,7 @@ interface Props {
   project: Project | null;
   readonly?: boolean;
   categoryLabel: string;
+  showNote?: boolean;
 }
 
 export default function PlanRangeChips({
@@ -13,6 +14,7 @@ export default function PlanRangeChips({
   project,
   readonly,
   categoryLabel,
+  showNote = true,
 }: Props) {
   void readonly;
   if (!cell) return null;
@@ -36,7 +38,9 @@ export default function PlanRangeChips({
           </span>
         )}
       </div>
-      {cell.note && <div className="plan-cell-note">{cell.note}</div>}
+      {showNote && cell.note && (
+        <div className="plan-cell-note">{cell.note}</div>
+      )}
     </div>
   );
 }

src/admin/pages/PlanWork.tsx

@@ -17,7 +17,11 @@ import PlanCategoriesModal from "../components/PlanCategoriesModal";
 import Forbidden from "../components/Forbidden";
 import { Button, Alert, LoadingState, PageEnter } from "../ui";
 import { projectListOptions, type Project } from "../lib/queries/projects";
-import { planCategoriesOptions, type PlanCategory } from "../lib/queries/plan";
+import {
+  planCategoriesOptions,
+  type PlanCategory,
+  type ResolvedCell,
+} from "../lib/queries/plan";
 // plan.css is imported once globally in AdminApp.tsx — no per-page re-import.
 
 const MONTH_NAMES = [
@@ -202,7 +206,8 @@ export default function PlanWork() {
   );
 
   const openCell = useCallback(
-    (userId: number, date: string) => {
+    (userId: number, date: string, _cells: ResolvedCell[]) => {
+      void _cells;
       const cell = getCell(grid, userId, date);
       // Past-date guard: the server rejects create/edit on past dates with
       // a 403 (see assertNotPastDate in plan.service.ts). To keep the user