codeSplitters: check live output, the key form and key rotation on the live site #350

Follow-up from #248 (PR #346). Covered by tests and a local browser run, not yet on https://codesplitters.notryanquinn.workers.dev. It needs the site deployed with CODESPLITTERS_DEPLOYS=1 and a signed-in admin, so it waits for you. Do it alongside #309's first real hosted deploy.

Steps

• While the deploy step runs, its log in the Deploy panel grows as it goes, not all at once when the step ends. The token shows as <deploy key>, never in full.
• Press Replace on a key while a deploy runs and start typing: what you typed stays put through the panel's refreshes.
• Rotate DEPLOY_SECRETS_KEY as the README's "Rotating it" steps say (a DEPLOY_SECRETS_KEY_OLD item, deploy, Re-seal on the admin page, delete the old item, deploy). Then deploy the repo again: it updates the same Worker.

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