fix(sync): avoid unnecessary uvc helper restarts

Cargo.lock

@@ -1642,7 +1642,7 @@ checksum = "09edd9e8b54e49e587e4f6295a7d29c3ea94d469cb40ab8ca70b288248a81db2"
 
 [[package]]
 name = "lesavka_client"
-version = "0.14.23"
+version = "0.14.24"
 dependencies = [
  "anyhow",
  "async-stream",
@@ -1676,7 +1676,7 @@ dependencies = [
 
 [[package]]
 name = "lesavka_common"
-version = "0.14.23"
+version = "0.14.24"
 dependencies = [
  "anyhow",
  "base64",
@@ -1688,7 +1688,7 @@ dependencies = [
 
 [[package]]
 name = "lesavka_server"
-version = "0.14.23"
+version = "0.14.24"
 dependencies = [
  "anyhow",
  "base64",

client/Cargo.toml

@@ -4,7 +4,7 @@ path                    = "src/main.rs"
 
 [package]
 name                    = "lesavka_client"
-version                 = "0.14.23"
+version                 = "0.14.24"
 edition                 = "2024"
 
 [dependencies]

common/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name                    = "lesavka_common"
-version                 = "0.14.23"
+version                 = "0.14.24"
 edition                 = "2024"
 build                   = "build.rs"
 

scripts/install/server.sh

@@ -669,7 +669,6 @@ cat <<'UNIT' | sudo tee /etc/systemd/system/lesavka-uvc.service >/dev/null
 Description=lesavka UVC control helper
 After=lesavka-core.service
 Requires=lesavka-core.service
-RefuseManualStop=yes
 
 [Service]
 ExecStart=/usr/local/bin/lesavka-uvc.sh
@@ -700,9 +699,11 @@ sudo rm -f /etc/systemd/system/lesavka-watchdog.timer \
 
 sudo systemctl daemon-reload
 
-if systemctl is-active --quiet lesavka-uvc; then
+if [[ "$UVC_ENV_CHANGED" == "1" ]] && systemctl is-active --quiet lesavka-uvc; then
   sudo systemctl restart lesavka-uvc
   echo "✅  lesavka-uvc restarted with the refreshed UVC runtime settings."
+elif systemctl is-active --quiet lesavka-uvc; then
+  echo "✅  lesavka-uvc already active; runtime settings unchanged."
 else
   echo "⚠️  lesavka-uvc is not active; start via lesavka-core dependency path."
 fi

server/Cargo.toml

@@ -10,7 +10,7 @@ bench                   = false
 
 [package]
 name                    = "lesavka_server"
-version                 = "0.14.23"
+version                 = "0.14.24"
 edition                 = "2024"
 autobins                = false
 

testing/tests/server_install_script_contract.rs

@@ -69,6 +69,14 @@ fn server_install_pins_hdmi_camera_and_display_defaults() {
         SERVER_INSTALL.contains("video-output node did not appear after rebuild"),
         "install script should explain why it refuses a half-applied UVC install"
     );
+    assert!(
+        !SERVER_INSTALL.contains("RefuseManualStop=yes"),
+        "install script should not generate a UVC unit that blocks legitimate refreshes"
+    );
+    assert!(
+        SERVER_INSTALL.contains("lesavka-uvc already active; runtime settings unchanged."),
+        "install script should avoid unnecessary UVC restarts when nothing changed"
+    );
 }
 
 #[test]