test(e2e): bootstrap pages automatically

[loganj]

🤖

Summary

Playwright E2E runs can surface SecurityError: Failed to read the 'localStorage' property from 'Window' when the first app navigation never committed and the browser remains on opaque-origin about:blank. The storage error hides the real problem: a missing E2E build or unavailable preview server.

This PR makes app-origin bootstrap automatic for every desktop and web E2E test. Test bodies now begin only after a successful HTTP navigation to the configured origin, so a failed first navigation reports its expected origin, current URL, and the build/preview-server remedy at the fault.

• Desktop and web suites export a shared test API that automatically bootstraps the page after beforeEach setup and before each test body. All E2E specs import that API rather than @playwright/test directly.
• Tests that genuinely need setup before their first navigation can narrowly opt out with test.use({ e2eBootstrap: false }) and invoke the guarded bootstrap after registering setup. The draft-storage test demonstrates this path.
• Storage seed scripts remain origin-guarded; the active-identity seed now follows the same rule. Genuine storage failures are not suppressed.
• Bootstrap coverage verifies both the automatic positive path and the unavailable-server negative path. The root smoke entrypoint continues to build before running Playwright.

Related issue

None found — this hardens the E2E harness based on the Playwright-on-Blox root-cause probe.

[loganj]

nope, sending this back