[codex] Fix hosted channel bootstrap

[juliusmarminge]

What changed

• Treat release builds with VITE_HOSTED_APP_CHANNEL=latest|nightly as hosted static apps when no backend URL is configured.
• Add coverage for direct channel aliases such as https://nightly.app.t3.codes.

Why

The hosted-static guard only recognized the router origin from VITE_HOSTED_APP_URL (https://app.t3.codes). Direct channel aliases like nightly.app.t3.codes fell through to the primary/local environment bootstrap path, which fetched /.well-known/t3/environment from Vercel. Vercel served index.html, and the client tried to parse it as JSON, causing Unexpected token '<', "<!doctype"... is not valid JSON.

Validation

• bun --filter=@t3tools/web run test -- hostedPairing.test.ts
• bun fmt
• bun lint
• bun typecheck
• bun run release:smoke

Note

Fix hosted channel bootstrap to support nightly and latest release channels

• Adds configuredHostedAppChannel in hostedPairing.ts to read VITE_HOSTED_APP_CHANNEL from env; returns "latest" or "nightly" if set, otherwise null.
• Updates isHostedStaticApp to return true when a valid hosted channel is configured and no backend URL is set, instead of relying solely on URL origin matching.
• Introduces resolveWebAssetBrandForChannel in brand-assets.ts mapping "nightly" → "nightly" brand and "latest" → "production", with nightly-specific favicon and icon paths.
• Updates the Vercel build command in vercel.ts to pass --channel (defaulting to "latest") to apply-web-brand-assets, so the correct brand assets are applied per channel.

^{Macroscope summarized 0422aff.}

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Note

Medium Risk
Changes the hosted/static bootstrap decision and Vercel build-time asset selection, which could affect how hosted deployments initialize and display branding across channels. Scope is limited and covered by new unit tests for channel alias handling and asset mapping.

Overview
Fixes hosted-static detection to treat builds with VITE_HOSTED_APP_CHANNEL (latest/nightly) as hosted static apps when no backend URL is configured, so channel alias domains (e.g. nightly.app.t3.codes) don’t fall into the primary/local bootstrap path.

Updates the Vercel build to pass the release channel into apply-web-brand-assets, expands branding assets to include a nightly web icon set, and adds tests for the new channel-to-brand mapping and nightly icon overrides.

^{Reviewed by Cursor Bugbot for commit 0422aff. Bugbot is set up for automated code reviews on this repo. Configure here.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/fix-hosted-channel-bootstrap

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[macroscopeapp]

Approvability

Verdict: Approved

This is a targeted fix ensuring hosted channel deployments (nightly/latest) are properly detected as static apps, with corresponding nightly brand assets support. The changes are well-tested, limited in scope, and authored by a repository admin.

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Dismissing prior approval to re-evaluate 0422aff