fmt: cargo fmt sweep

No logic changes - line reflow, brace placement, and method-chain splits
across handlers / personas / state / faces / knowledge / insights_dao /
knowledge_dao / populate_knowledge. Picked up incidentally while running
fmt for the sms-search work.

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

src/ai/handlers.rs

@@ -885,10 +885,7 @@ pub async fn chat_history_handler(
         .flatten()
         .unwrap_or_else(|| app_state.primary_library());
 
-    match app_state
-        .insight_chat
-        .load_history(library.id, &query.path)
-    {
+    match app_state.insight_chat.load_history(library.id, &query.path) {
         Ok(view) => HttpResponse::Ok().json(ChatHistoryHttpResponse {
             messages: view
                 .messages