feat(mui): consistent staggered page entrance across all 43 route pages

Adopt the PageEnter wrapper as every page's outermost render element and remove the ad-hoc per-page entrance motion.div wrappers. Every page now enters the same way — all top-level sections rise+fade in, staggered — so nothing appears instantly and the motion is identical app-wide. Presentation-only: no data/logic/hooks/invalidate/permissions touched. Embedded sub-tabs (CompanySettings, ReceivedInvoices), Login (auth shell) and the dev UiKit are intentionally excluded. Gates: tsc -b --noEmit=0, build=0, vitest 152/152.

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

src/admin/pages/WarehouseInventory.tsx

@@ -1,6 +1,5 @@
 import { useState } from "react";
 import { useNavigate } from "react-router-dom";
-import { motion } from "framer-motion";
 import Box from "@mui/material/Box";
 import { useAuth } from "../context/AuthContext";
 import Forbidden from "../components/Forbidden";
@@ -19,6 +18,7 @@ import {
   Select,
   StatusChip,
   PageHeader,
+  PageEnter,
   FilterBar,
   EmptyState,
   LoadingState,
@@ -127,25 +127,19 @@ export default function WarehouseInventory() {
   ];
 
   return (
-    <Box>
-      <motion.div
-        initial={{ opacity: 0, y: 12 }}
-        animate={{ opacity: 1, y: 0 }}
-        transition={{ duration: 0.25 }}
-      >
-        <PageHeader
-          title="Inventury"
-          subtitle={subtitle}
-          actions={
-            <Button
-              startIcon={PlusIcon}
-              onClick={() => navigate("/warehouse/inventory/new")}
-            >
-              Nová inventura
-            </Button>
-          }
-        />
-      </motion.div>
+    <PageEnter>
+      <PageHeader
+        title="Inventury"
+        subtitle={subtitle}
+        actions={
+          <Button
+            startIcon={PlusIcon}
+            onClick={() => navigate("/warehouse/inventory/new")}
+          >
+            Nová inventura
+          </Button>
+        }
+      />
 
       <FilterBar>
         <Box sx={{ flex: "0 0 200px" }}>
@@ -199,6 +193,6 @@ export default function WarehouseInventory() {
           onChange={setPage}
         />
       </Card>
-    </Box>
+    </PageEnter>
   );
 }