diff --git a/src-tauri/src/web/handlers/system_settings.rs b/src-tauri/src/web/handlers/system_settings.rs
index 17a6fa4..4645ae1 100644
--- a/src-tauri/src/web/handlers/system_settings.rs
+++ b/src-tauri/src/web/handlers/system_settings.rs
@@ -1,4 +1,5 @@
 use axum::{extract::Extension, Json};
+use serde::Deserialize;
 use tauri::Manager;
 
 use crate::app_error::AppCommandError;
@@ -12,6 +13,20 @@ const SYSTEM_PROXY_SETTINGS_KEY: &str = "system_proxy_settings";
 const SYSTEM_LANGUAGE_SETTINGS_KEY: &str = "system_language_settings";
 const LANGUAGE_SETTINGS_UPDATED_EVENT: &str = "app://language-settings-updated";
 
+// Wrapper structs to match Tauri's named parameter convention.
+// Frontend sends `{ settings: <T> }` which Tauri `invoke()` unwraps automatically,
+// but in web mode the entire JSON body arrives as-is.
+
+#[derive(Deserialize)]
+pub struct UpdateProxySettingsParams {
+    pub settings: SystemProxySettings,
+}
+
+#[derive(Deserialize)]
+pub struct UpdateLanguageSettingsParams {
+    pub settings: SystemLanguageSettings,
+}
+
 // ---------------------------------------------------------------------------
 // Read handlers
 // ---------------------------------------------------------------------------
@@ -39,8 +54,9 @@ pub async fn get_system_language_settings(
 
 pub async fn update_system_proxy_settings(
     Extension(app): Extension<tauri::AppHandle>,
-    Json(settings): Json<SystemProxySettings>,
+    Json(params): Json<UpdateProxySettingsParams>,
 ) -> Result<Json<SystemProxySettings>, AppCommandError> {
+    let settings = params.settings;
     let db = app.state::<AppDatabase>();
 
     // TODO: call normalize_proxy_settings once it is made pub(crate) in
@@ -64,8 +80,9 @@ pub async fn update_system_proxy_settings(
 
 pub async fn update_system_language_settings(
     Extension(app): Extension<tauri::AppHandle>,
-    Json(settings): Json<SystemLanguageSettings>,
+    Json(params): Json<UpdateLanguageSettingsParams>,
 ) -> Result<Json<SystemLanguageSettings>, AppCommandError> {
+    let settings = params.settings;
     let db = app.state::<AppDatabase>();
 
     let serialized = serde_json::to_string(&settings).map_err(|e| {
diff --git a/src-tauri/src/web/handlers/version_control.rs b/src-tauri/src/web/handlers/version_control.rs
index 41604cb..6151932 100644
--- a/src-tauri/src/web/handlers/version_control.rs
+++ b/src-tauri/src/web/handlers/version_control.rs
@@ -41,6 +41,16 @@ pub struct SaveAccountTokenParams {
     pub token: String,
 }
 
+#[derive(Deserialize)]
+pub struct UpdateGitSettingsParams {
+    pub settings: GitSettings,
+}
+
+#[derive(Deserialize)]
+pub struct UpdateGitHubAccountsParams {
+    pub settings: GitHubAccountsSettings,
+}
+
 // ---------------------------------------------------------------------------
 // Git detection
 // ---------------------------------------------------------------------------
@@ -84,8 +94,9 @@ pub async fn get_git_settings(
 
 pub async fn update_git_settings(
     Extension(app): Extension<tauri::AppHandle>,
-    Json(settings): Json<GitSettings>,
+    Json(params): Json<UpdateGitSettingsParams>,
 ) -> Result<Json<GitSettings>, AppCommandError> {
+    let settings = params.settings;
     let db = app.state::<AppDatabase>();
     let serialized = serde_json::to_string(&settings).map_err(|e| {
         AppCommandError::invalid_input("Failed to serialize git settings")
@@ -125,8 +136,9 @@ pub async fn get_github_accounts(
 
 pub async fn update_github_accounts(
     Extension(app): Extension<tauri::AppHandle>,
-    Json(settings): Json<GitHubAccountsSettings>,
+    Json(params): Json<UpdateGitHubAccountsParams>,
 ) -> Result<Json<GitHubAccountsSettings>, AppCommandError> {
+    let settings = params.settings;
     let db = app.state::<AppDatabase>();
     let serialized = serde_json::to_string(&settings).map_err(|e| {
         AppCommandError::invalid_input("Failed to serialize GitHub accounts")