test: rebrand hardcoded 'Element' test expectations to 'HealthChat'

Update brand-string assertions and snapshots that asserted the upstream
'Element' brand to the HealthChat brand:
- positionFailureMessage, Map, LocationShareMenu (geolocation messages)
- SupportedBrowser, init (incompatible-browser title + snapshot)
- ElectronPlatform (device display name 'HealthChat Desktop: <os>')
- RoomView (third-party invite waiting view)
- MatrixChat soft-logout snapshot

Leaves non-brand failures untouched (e.g. MatrixChat multi-tab lockout,
extended-profile mock gaps).

apps/web/test/unit-tests/components/structures/RoomView-test.tsx

@@ -826,10 +826,10 @@ describe("RoomView", () => {
         });
 
         it("should render the »waiting for third-party« view", () => {
-            expect(screen.getByText("Waiting for users to join Element")).toBeInTheDocument();
+            expect(screen.getByText("Waiting for users to join HealthChat")).toBeInTheDocument();
             expect(
                 screen.getByText(
-                    "Once invited users have joined Element, you will be able to chat and the room will be end-to-end encrypted",
+                    "Once invited users have joined HealthChat, you will be able to chat and the room will be end-to-end encrypted",
                 ),
             ).toBeInTheDocument();
 

apps/web/test/unit-tests/components/structures/__snapshots__/MatrixChat-test.tsx.snap

@@ -327,7 +327,7 @@ exports[`<MatrixChat /> with a soft-logged-out session should show the soft-logo
           >
             <img
               alt="Element"
-              src="themes/element/img/logos/element-logo.svg"
+              src="themes/element/img/logos/element-logo.png"
             />
           </aside>
           <div