Two engine fixes. Click targets now emit a full mouse sequence (mousedown, mouseup, click) instead of click alone: several common widgets listen for mousedown rather than click, so their menus never opened — a field could be submitted correctly while appearing empty on screen. Existing click-only targets are unaffected. The popup's forced configuration reload now allows 5 seconds instead of 800 ms and reports failure instead of silently keeping the stale cache, which made mapping changes look applied when they were not.

Onboarding fixes. The welcome screen now presents both paths as two side-by-side cards of equal visual weight — enter a subscriber code, or try Layer on a demo page — instead of a small grey back-arrow link that read as a way to go back rather than an alternative. Also fixes a missing screenshot on the walkthrough screen: the image was referenced by the page but excluded by the build scripts, so users saw an empty frame exactly where they are asked to spot a button.

Each tracking event (install, transfer_complete, target_unavailable) now carries a browser identifier (chrome, firefox, edge, opera, unknown), detected at runtime with no external dependency. Enables Chrome vs Firefox analytics split in the admin dashboard. Backward compatible: pre-3.3.10 events continue to display as before.