feat: Write project config to temporary file then atomically rename (#1252)

* feat: Write project config to temporary file then atomically rename

* format

* use unique temp file names

* fix

---------

Co-authored-by: seer-by-sentry[bot] <157164994+seer-by-sentry[bot]@users.noreply.github.com>
Co-authored-by: Brendan Allan <brendonovich@outlook.com>

Author: seer-by-sentry[bot]

Cargo.lock

@@ -17,3 +17,5 @@ either = "1.13.0"
 relative-path = { version = "1.9.3", features = ["serde"] }
 log = "0.4"
 tracing = "0.1.41"
+tempfile = "3.23.0"
+uuid = { version = "1.18.1", features = ["v4"]}

crates/project/Cargo.toml

@@ -1,4 +1,5 @@
 use std::{
+    env::temp_dir,
     ops::{Add, Div, Mul, Sub, SubAssign},
     path::Path,
 };
@@ -639,10 +640,17 @@ impl ProjectConfiguration {
     }
 
     pub fn write(&self, project_path: impl AsRef<Path>) -> Result<(), std::io::Error> {
-        std::fs::write(
-            project_path.as_ref().join("project-config.json"),
-            serde_json::to_string_pretty(self)?,
-        )
+        let temp_path = temp_dir().join(uuid::Uuid::new_v4().to_string());
+
+        // Write to temporary file first to ensure readers don't see partial files
+        std::fs::write(&temp_path, serde_json::to_string_pretty(self)?)?;
+
+        std::fs::rename(
+            &temp_path,
+            &project_path.as_ref().join("project-config.json"),
+        )?;
+
+        Ok(())
     }
 
     pub fn get_segment_time(&self, frame_time: f64) -> Option<(f64, u32)> {