[haspadar]

Summary

• Recorded the served offer on campaign fallback clicks using {offer:name} or {offer:uuid}
• Preserved unattributed clicks for blank, 403, and 404 fallback responses
• Added regression coverage for redirect modes and offer-token postbacks

Reproduction and verification

Configure a campaign fallback as {offer:Reserve} and either leave the campaign without a matching flow or disable its last target offer. The visitor reaches Reserve, but the click is logged with offer_id = NULL. A postback using Reserve's valid token is then rejected with HTTP 409, token/click offer mismatch.

The fix records the resolved active offer before logging redirect-style fallback clicks. The existing postback token checks remain unchanged. No migration or new dependency is required.

With the regression tests added and the runtime unchanged, 11 cases fail: ten missing offer attributions and one postback returning 409 instead of 200. With the fix:

• Unit, integration, and architecture suites: 655 passed, 5 skipped, 0 failures
• PHPStan: no errors
• Composer validation and git diff --check: passed

Verification used an isolated local fixture database; no public deployment was contacted.