Wake Render backend before embedded login

[xrpbanks]

Summary

• wake the spun-down Render backend with a GET health probe before creating embedded login state
• show a clear cold-start message while WordPress prepares Xaman in parallel
• add behavioral coverage proving readiness precedes login-state creation

Verification

• Node embedded-login behavior tests pass
• frontend lint passes
• production build passes

[Copilot]

Pull request overview

This PR improves the embedded Xaman login flow by proactively waking a potentially cold Render backend (via a health/readiness probe) before attempting to create the login state, and adds a regression test to ensure the readiness step happens first.

Changes:

• Add prepareEmbeddedLogin() to run waitForBackendReady() before startLoginWithRetry() for embedded login.
• Update the embedded login path in XamanLoginPanel to use the new preparation function and show progress messaging during cold start.
• Add a Node behavioral test that verifies backend readiness occurs before login-state creation.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
tools/tests/xaman_login_start_retry.test.mjs	Adds coverage asserting the embedded flow wakes the backend before calling login/start.
frontend/components/XamanLoginPanel.tsx	Introduces prepareEmbeddedLogin() and routes embedded login through it with a new “waking-up” progress phase.

Suppressed comments (1)

frontend/components/XamanLoginPanel.tsx:623

• During the new "waking-up" phase, the UI message claims "Xaman is ready", but at this point we are only warming the backend (WordPress/Xaman preparation may still be in progress). This conflicts with the intent to show a cold-start message while WordPress prepares Xaman in parallel and can mislead users.

              reason === "waking-up"
                ? "Xaman is ready. Starting the secure CalorieApp service. This can take about a minute. Keep this page open."

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