Notify about broken task file contents (#27185)

Closes https://github.com/zed-industries/zed/issues/23783


https://github.com/user-attachments/assets/df019f68-a76b-4953-967a-a35ed21206ab

Release Notes:

- Added notifications when invalid tasks.json/debug.json is saved

crates/settings/src/settings_store.rs

@@ -5,7 +5,9 @@ use fs::Fs;
 use futures::{channel::mpsc, future::LocalBoxFuture, FutureExt, StreamExt};
 use gpui::{App, AsyncApp, BorrowAppContext, Global, Task, UpdateGlobal};
 
-use paths::{local_settings_file_relative_path, EDITORCONFIG_NAME};
+use paths::{
+    debug_task_file_name, local_settings_file_relative_path, task_file_name, EDITORCONFIG_NAME,
+};
 use schemars::{gen::SchemaGenerator, schema::RootSchema, JsonSchema};
 use serde::{de::DeserializeOwned, Deserialize, Serialize};
 use smallvec::SmallVec;
@@ -250,6 +252,16 @@ trait AnySettingValue: 'static + Send + Sync {
 
 struct DeserializedSetting(Box<dyn Any>);
 
+impl TaskKind {
+    /// Returns a file path of a task configuration file of this kind within the given directory.
+    pub fn config_in_dir(&self, dir: &Path) -> PathBuf {
+        dir.join(match self {
+            Self::Debug => debug_task_file_name(),
+            Self::Script => task_file_name(),
+        })
+    }
+}
+
 impl SettingsStore {
     pub fn new(cx: &App) -> Self {
         let (setting_file_updates_tx, mut setting_file_updates_rx) = mpsc::unbounded();
@@ -610,10 +622,11 @@ impl SettingsStore {
                 .map(|content| content.trim())
                 .filter(|content| !content.is_empty()),
         ) {
-            (LocalSettingsKind::Tasks(_), _) => {
+            (LocalSettingsKind::Tasks(task_kind), _) => {
                 return Err(InvalidSettingsError::Tasks {
                     message: "Attempted to submit tasks into the settings store".to_string(),
-                })
+                    path: task_kind.config_in_dir(&directory_path),
+                });
             }
             (LocalSettingsKind::Settings, None) => {
                 zed_settings_changed = self
@@ -1011,7 +1024,7 @@ pub enum InvalidSettingsError {
     ServerSettings { message: String },
     DefaultSettings { message: String },
     Editorconfig { path: PathBuf, message: String },
-    Tasks { message: String },
+    Tasks { path: PathBuf, message: String },
 }
 
 impl std::fmt::Display for InvalidSettingsError {
@@ -1021,7 +1034,7 @@ impl std::fmt::Display for InvalidSettingsError {
             | InvalidSettingsError::UserSettings { message }
             | InvalidSettingsError::ServerSettings { message }
             | InvalidSettingsError::DefaultSettings { message }
-            | InvalidSettingsError::Tasks { message }
+            | InvalidSettingsError::Tasks { message, .. }
             | InvalidSettingsError::Editorconfig { message, .. } => {
                 write!(f, "{message}")
             }