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/vector/init-test.ts

@@ -30,7 +30,7 @@ describe("showIncompatibleBrowser", () => {
 
     it("should match snapshot", async () => {
         await showIncompatibleBrowser(jest.fn());
-        await screen.findByText("Element does not support this browser");
+        await screen.findByText("HealthChat does not support this browser");
         expect(document.getElementById("matrixchat")).toMatchSnapshot();
     });
 });