feat(plan): resolveCell/resolveGrid return arrays; dashboard shows up to 3

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/admin/components/PlanGrid.tsx

@@ -529,7 +529,8 @@ export default function PlanGrid({
                   </span>
                 </td>
                 {users.map((u) => {
-                  const cell = data.cells[u.id]?.[date] ?? null;
+                  const cellArr = data.cells[u.id]?.[date] ?? [];
+                  const cell = cellArr[0] ?? null;
                   const past = isPastDate(date, today);
                   // Past-day cells are read-only in the UI: an empty past
                   // cell is non-interactive (no create modal, no "+" hint),

src/admin/components/dashboard/DashTodayPlan.tsx

@@ -3,7 +3,7 @@ import Typography from "@mui/material/Typography";
 import { Card } from "../../ui";
 import { formatDate } from "../../utils/formatters";
 
-/** The logged-in user's resolved work plan for today (see GET /api/admin/dashboard). */
+/** One resolved plan record for today (see GET /api/admin/dashboard). */
 export interface TodayPlan {
   shift_date: string;
   category: string;
@@ -23,15 +23,64 @@ function projectLabel(p: TodayPlan): string {
   return parts.length > 0 ? parts.join(" — ") : "Bez projektu";
 }
 
-/**
- * "Vaše dnešní zařazení" — shows the logged-in user's work-plan entry for today
- * (category + project/site + note, with a range badge when the day is part of a
- * multi-day range). `plan === null` = the user has plan access but nothing is
- * scheduled today (muted empty state). Rendered near the clock-in on the
- * dashboard; the caller gates it on the plan permission.
- */
-export default function DashTodayPlan({ plan }: { plan: TodayPlan | null }) {
-  const color = plan?.category_color || "var(--mui-palette-primary-main)";
+function PlanRow({ plan }: { plan: TodayPlan }) {
+  const color = plan.category_color || "var(--mui-palette-primary-main)";
+  return (
+    <Box sx={{ display: "flex", flexDirection: "column", gap: 1 }}>
+      <Box
+        sx={{ display: "flex", alignItems: "center", gap: 1, flexWrap: "wrap" }}
+      >
+        <Box
+          sx={{
+            display: "inline-flex",
+            alignItems: "center",
+            gap: 0.75,
+            px: 1.25,
+            py: 0.5,
+            borderRadius: 999,
+            border: 1,
+            borderColor: "divider",
+            bgcolor: `color-mix(in srgb, ${color} 12%, transparent)`,
+          }}
+        >
+          <Box
+            sx={{
+              width: 10,
+              height: 10,
+              borderRadius: "50%",
+              bgcolor: color,
+              flexShrink: 0,
+            }}
+          />
+          <Typography
+            component="span"
+            sx={{ fontWeight: 700, fontSize: "0.8rem" }}
+          >
+            {plan.category_label}
+          </Typography>
+        </Box>
+        {plan.rangeFrom && plan.rangeTo && plan.rangeFrom !== plan.rangeTo && (
+          <Typography variant="caption" color="text.secondary">
+            součást rozsahu {formatDate(plan.rangeFrom)} –{" "}
+            {formatDate(plan.rangeTo)}
+          </Typography>
+        )}
+      </Box>
+      <Typography variant="h6" sx={{ lineHeight: 1.25 }}>
+        {projectLabel(plan)}
+      </Typography>
+      {plan.note && (
+        <Typography variant="body2" color="text.secondary">
+          {plan.note}
+        </Typography>
+      )}
+    </Box>
+  );
+}
+
+/** "Vaše dnešní zařazení" — the logged-in user's resolved plan record(s) for
+ * today (up to 3). Empty array = nothing scheduled. */
+export default function DashTodayPlan({ plans }: { plans: TodayPlan[] }) {
   return (
     <Card sx={{ mb: 3 }}>
       <Typography
@@ -40,65 +89,20 @@ export default function DashTodayPlan({ plan }: { plan: TodayPlan | null }) {
       >
         Vaše dnešní zařazení
       </Typography>
-
-      {plan ? (
-        <Box sx={{ display: "flex", flexDirection: "column", gap: 1 }}>
-          <Box
-            sx={{
-              display: "flex",
-              alignItems: "center",
-              gap: 1,
-              flexWrap: "wrap",
-            }}
-          >
+      {plans.length > 0 ? (
+        <Box sx={{ display: "flex", flexDirection: "column", gap: 2 }}>
+          {plans.map((p, i) => (
             <Box
+              key={i}
               sx={{
-                display: "inline-flex",
-                alignItems: "center",
-                gap: 0.75,
-                px: 1.25,
-                py: 0.5,
-                borderRadius: 999,
-                border: 1,
+                pt: i === 0 ? 0 : 2,
+                borderTop: i === 0 ? 0 : 1,
                 borderColor: "divider",
-                bgcolor: `color-mix(in srgb, ${color} 12%, transparent)`,
               }}
             >
-              <Box
-                sx={{
-                  width: 10,
-                  height: 10,
-                  borderRadius: "50%",
-                  bgcolor: color,
-                  flexShrink: 0,
-                }}
-              />
-              <Typography
-                component="span"
-                sx={{ fontWeight: 700, fontSize: "0.8rem" }}
-              >
-                {plan.category_label}
-              </Typography>
+              <PlanRow plan={p} />
             </Box>
-            {plan.rangeFrom &&
-              plan.rangeTo &&
-              plan.rangeFrom !== plan.rangeTo && (
-                <Typography variant="caption" color="text.secondary">
-                  součást rozsahu {formatDate(plan.rangeFrom)} –{" "}
-                  {formatDate(plan.rangeTo)}
-                </Typography>
-              )}
-          </Box>
-
-          <Typography variant="h6" sx={{ lineHeight: 1.25 }}>
-            {projectLabel(plan)}
-          </Typography>
-
-          {plan.note && (
-            <Typography variant="body2" color="text.secondary">
-              {plan.note}
-            </Typography>
-          )}
+          ))}
         </Box>
       ) : (
         <Typography variant="body2" color="text.secondary">