Refactor Event Signing and Update Test Cases

- Changed the event signing method in App.svelte from `sign` to `signEvent` for clarity and consistency.
- Updated the privileged events test to replace `PrivateDirectMessage` with `DirectMessage`, aligning with the latest event kind definitions.
- Adjusted the bundle.js and bundle.js.map files to reflect the latest build changes and optimizations.

app/privileged_events_test.go

@@ -248,7 +248,7 @@ func TestAllPrivilegedKinds(t *testing.T) {
 		kind.JWTBinding.K,
 		kind.ApplicationSpecificData.K,
 		kind.Seal.K,
-		kind.PrivateDirectMessage.K,
+		kind.DirectMessage.K,
 	}
 
 	for _, k := range privilegedKinds {