Run cargo fmt on PR #193 code to satisfy the fmt hook

The squashed thinking-notice PR was committed with --no-verify, so three
files were never run through `cargo fmt` under the project's pinned
toolchain (rust-toolchain.toml = 1.96.0). Format them so `cargo fmt
--all -- --check` passes — a prerequisite for wiring the prek suite
(which includes that check) into CI in the next commit.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/bot/messaging.rs

@@ -2,7 +2,8 @@ use mxlink::matrix_sdk::{
     Room,
     room::edit::EditedContent,
     ruma::{
-        EventId, OwnedEventId, api::client::receipt::create_receipt::v3::ReceiptType,
+        EventId, OwnedEventId,
+        api::client::receipt::create_receipt::v3::ReceiptType,
         events::room::message::{
             OriginalSyncRoomMessageEvent, RoomMessageEventContentWithoutRelation,
         },