feat(record): add popup quick-actions launcher and make record --url optional

Add a popup launcher + action-recording panel that builds a copyable
`bsk record start` prompt, add `--browser` targeting, and default `--url`
to https://example.com/ when omitted. Drop the popup browser-alias field.

apps/extension/src/content/record-capture.ts

@@ -1,8 +1,4 @@
-import {
-  describeEventTarget,
-  describeTarget,
-  type TargetDescriptor,
-} from "@/lib/describe-target";
+import { describeEventTarget, describeTarget, type TargetDescriptor } from "@/lib/describe-target";
 import {
   isRecordCancelMessage,
   isRecordStartMessage,