feat: add --react-email flag to send emails from .tsx templates

[felipefreitag]

Adds a --react-email flag that bundles a React Email .tsx template with esbuild, renders it to HTML, and uses it as the email body.

Supported on emails send, emails batch, broadcasts create, broadcasts update, templates create and templates update.

Follows the same pipeline as react-email's email export command: esbuild bundle → require → render(createElement(component, {})) → HTML string

Closes #73

[cubic-dev-ai]

4 issues found across 15 files

Prompt for AI agents (unresolved issues)

Check if these issues are valid — if so, understand the root cause of each and fix them. If appropriate, use sub-agents to investigate and fix each issue separately.


<file name="src/commands/broadcasts/create.ts">

<violation number="1" location="src/commands/broadcasts/create.ts:105">
P2: `--react-email` is incorrectly made mutually exclusive with `--text`/`--text-file`, which blocks valid HTML+text broadcast creation.</violation>
</file>

<file name="src/lib/react-email-bundler.ts">

<violation number="1" location="src/lib/react-email-bundler.ts:18">
P2: Clean up the temp directory when esbuild fails; current error path leaks temporary folders.</violation>
</file>

<file name="src/commands/templates/create.ts">

<violation number="1" location="src/commands/templates/create.ts:108">
P2: `--react-email` incorrectly forbids `--text`/`--text-file`, which breaks the documented plain-text fallback flow.</violation>
</file>

<file name="src/lib/react-email.ts">

<violation number="1" location="src/lib/react-email.ts:19">
P2: Calling `outputError` inside the `try`/`catch` exits the process before the `finally` cleanup runs, so temporary build directories can be leaked on failure paths.</violation>
</file>

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