fix: rust 1.95.0 clippy lints and matrix-sdk 0.17 API changes

Toolchain bump surfaced new lints (derivable_impls,
unnecessary_unwrap, unnecessary_sort_by, while_let_loop,
collapsible_match, unnecessary_option_map_or_else, cmp_owned)
across bft-json-crdt and huskies-server. All fixed mechanically.

Cargo.toml: dropped the no-longer-existing `rustls-tls` matrix-sdk
feature, then chased through the 0.17 API breakage:
- Relation::Reply is now a tuple variant wrapping Reply, not a
  struct variant with `in_reply_to`
- UserIdentifier::UserIdOrLocalpart removed — use
  UserIdentifier::Matrix(MatrixUserIdentifier::new(..))
- SendMessageLikeEventResult no longer exposes event_id directly;
  it's now on the inner `response` field

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

server/src/http/ws/mod.rs

@@ -90,11 +90,8 @@ pub async fn ws_handler(ws: WebSocket, ctx: Data<&Arc<AppContext>>) -> impl poem
         let mut pending_perms: HashMap<String, oneshot::Sender<PermissionDecision>> =
             HashMap::new();
 
-        loop {
-            // Outer loop: wait for the next WebSocket message.
-            let Some(Ok(WsMessage::Text(text))) = stream.next().await else {
-                break;
-            };
+        // Outer loop: wait for the next WebSocket message.
+        while let Some(Ok(WsMessage::Text(text))) = stream.next().await {
 
             // Handle read-RPC frames (discriminated by "kind", not "type").
             if let Some(rpc_resp) = crate::crdt_sync::try_handle_rpc_text(&text).await {