Matt
7881da675b
Adds a plaintext-only SMTP connectivity test on the email-settings
page. Distinct from the branding-preview "Send a test" affordance:
- branding-preview exercises the full rendering pipeline (logo +
branded shell + colour) — useful for confirming the email *looks*
right.
- this test isolates SMTP — minimal HTML, plaintext alternative, no
logo dependency — so a failure is purely transport. Confirms the
configured credentials (env or per-port DB) reach the wire before
a real notification flow depends on them.
SMTP errors surface inline below the input (auth failure, ENOTFOUND,
connection refused, etc.) rather than as a passing toast — the whole
point of the test is to read them.
`/api/v1/admin/email/test-send` route reuses `sendEmail(...,
ctx.portId)` so per-port SMTP overrides are exercised the same way a
real notification would.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>