test(injected): add unit coverage for autofillPasskeys feature

Add Jasmine tests for the Windows passkey interception flow merged in
#2571, covering request registration, native message correlation, abort
handling, supersede behavior, and credentials.get pass-through guards.

Fix ESM import paths in autofill-passkeys.js so the feature can be loaded
by the unit test runner (no behavior change).

Co-authored-by: Jonathan Kingston <jonathanKingston@users.noreply.github.com>

Author: cursoragent

injected/src/features/autofill-passkeys.js

@@ -1,4 +1,4 @@
-import ContentFeature from '../content-feature';
+import ContentFeature from '../content-feature.js';
 /* eslint-disable no-redeclare */
 import {
     Uint8Array,
@@ -7,7 +7,7 @@ import {
     DOMException as CapturedDOMException,
     charCodeAt,
     randomUUID,
-} from '../captured-globals';
+} from '../captured-globals.js';
 /* eslint-enable no-redeclare */
 
 const MSG_INBOUND_PASSKEY_SELECTED = 'passkeySelected';