fix(web): restore even tab spacing under MUI v9

MUI v9 dropped the `MuiTabs-flexContainer` utility class from the Tabs list
element (now only `MuiTabs-list`), so the `justifyContent: space-evenly`
override silently stopped matching and the place + saved-places tabs reverted
to left alignment. Point the selector at the v9 class name.

Author: Medformatik

apps/web/src/components/panels/place/PlaceDetailContent.tsx

@@ -319,7 +319,7 @@ export function PlaceDetailContent({ place, isLoading, onClose, clearSearchBar =
           ...theme.applyStyles("dark", { bgcolor: "background.default" }),
           zIndex: 1,
           minHeight: 48,
-          "& .MuiTabs-flexContainer": { justifyContent: "space-evenly" },
+          "& .MuiTabs-list": { justifyContent: "space-evenly" },
           "& .MuiTab-root": {
             textTransform: "none",
             fontSize: 14,

apps/web/src/components/panels/saved/SavedPlacesContent.tsx

@@ -42,7 +42,7 @@ export function SavedPlacesContent() {
         onChange={(_, v: number) => setActiveTab(v === 0 ? "lists" : "labeled")}
         sx={{
           minHeight: 48,
-          "& .MuiTabs-flexContainer": { justifyContent: "space-evenly" },
+          "& .MuiTabs-list": { justifyContent: "space-evenly" },
           "& .MuiTab-root": {
             textTransform: "none",
             fontSize: 14,