Raise MSRV to 1.95 and refactor nested if-lets with let-chains

Cargo.toml

@@ -2,7 +2,7 @@
 name = "flow-engine"
 version = "0.1.0"
 edition = "2024"
-rust-version = "1.85"
+rust-version = "1.95"
 description = "Node-RED-style visual flow editor + runtime in Rust (axum + SQLite + Svelte/xyflow). Single binary."
 
 [dependencies]

src/auth.rs

@@ -162,10 +162,10 @@ pub async fn logout(State(st): State<AppState>, req: Request) -> Response {
 
 /// Extract the token from the Authorization header or the `?token=` query.
 fn extract_token(req: &Request) -> Option<String> {
-    if let Some(value) = req.headers().get(header::AUTHORIZATION) {
-        if let Some(token) = value.to_str().ok().and_then(|s| s.strip_prefix("Bearer ")) {
-            return Some(token.to_string());
-        }
+    if let Some(value) = req.headers().get(header::AUTHORIZATION)
+        && let Some(token) = value.to_str().ok().and_then(|s| s.strip_prefix("Bearer "))
+    {
+        return Some(token.to_string());
     }
     req.uri().query().and_then(|q| {
         q.split('&')

src/runtime/mod.rs

@@ -49,11 +49,11 @@ fn merge_broker(
         .filter(|id| !id.is_empty())
         .and_then(|id| configs.get(id));
     let mut merged = node_cfg.clone();
-    if let (Some(broker), Some(obj)) = (broker, merged.as_object_mut()) {
-        if let Some(fields) = broker.as_object() {
-            for (k, v) in fields {
-                obj.insert(k.clone(), v.clone());
-            }
+    if let (Some(broker), Some(obj)) = (broker, merged.as_object_mut())
+        && let Some(fields) = broker.as_object()
+    {
+        for (k, v) in fields {
+            obj.insert(k.clone(), v.clone());
         }
     }
     merged

src/runtime/nodes/range.rs

@@ -84,10 +84,10 @@ impl RangeNode {
         let Some(v) = msgprop::get(msg, &self.property).and_then(|v| v.as_f64()) else {
             return;
         };
-        if let Some(mapped) = self.map(v) {
-            if let Some(n) = serde_json::Number::from_f64(mapped) {
-                msgprop::set(msg, &self.property, json!(n));
-            }
+        if let Some(mapped) = self.map(v)
+            && let Some(n) = serde_json::Number::from_f64(mapped)
+        {
+            msgprop::set(msg, &self.property, json!(n));
         }
     }
 }