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/e2e/helpers/sidebar.ts

@@ -1,6 +1,6 @@
 import { expect, type Page } from "@playwright/test";
 
-function requireServerId(): string {
+export function requireServerId(): string {
   const serverId = process.env.E2E_SERVER_ID;
   if (!serverId) {
     throw new Error("E2E_SERVER_ID is not set (expected from Playwright globalSetup).");