refactor(app/e2e): rewrite settings-navigation spec to zero raw locators (#726)

Replace 21 raw page.locator/getByTestId/getByText calls in the spec body
with named DSL operations in helpers/settings.ts. Each test body now reads
as prose: open settings, navigate to section, expect content.

New helpers: openCompactSettings, expectCompactSettingsList,
expectSettingsSidebarVisible/Hidden/Sections, goBackInSettings,
expectSettingsBackButton, clickSettingsBackToWorkspace,
verifyLegacyHostSettingsRedirect, openCompactSettingsHost,
expectHostSettingsUrl, expectAddHostMethodOptions, fillDirectHostUri,
expectDirectHostFormValues, expectDirectHostSslEnabled,
expectDirectHostUriValue/Hidden, expectDiagnosticsContent,
expectAboutContent, expectGeneralContent.

Export requireServerId from sidebar.ts so helpers encapsulate serverId
logic — spec has no direct env reads.

Also fix pre-existing typecheck error in use-keyboard-shortcuts.ts:
cast action.route to the expo-router Href type at call sites.

packages/app/src/hooks/use-keyboard-shortcuts.ts

@@ -97,13 +97,13 @@ export function useKeyboardShortcuts({
           navigateToWorkspace(action.serverId, action.workspaceId, { currentPathname: pathname });
           return true;
         case "router-replace":
-          router.replace(action.route);
+          router.replace(action.route as Parameters<typeof router.replace>[0]);
           return true;
         case "router-back":
           router.back();
           return true;
         case "router-push":
-          router.push(action.route);
+          router.push(action.route as Parameters<typeof router.push>[0]);
           return true;
         case "open-project-picker":
           void openProjectPickerAction();