fix: preserve file extensions in pull_from_gist backup (line 674)

Applies the same fix from line 551 to line 674: use with_file_name(format!("{}.bak", file_name))
instead of with_extension("md.bak") to append .bak extension rather than replace it.

Ensures settings.json → settings.json.bak instead of settings.md.bak

Author: prefrontalsys

src-tauri/src/commands/cloud_sync.rs

@@ -16,8 +16,8 @@ use tauri::State;
 fn find_gh() -> std::path::PathBuf {
     for candidate in &[
         "/opt/homebrew/bin/gh", // Homebrew on Apple Silicon
-        "/usr/local/bin/gh",   // Homebrew on Intel / manual install
-        "/usr/bin/gh",         // System install
+        "/usr/local/bin/gh",    // Homebrew on Intel / manual install
+        "/usr/bin/gh",          // System install
     ] {
         if std::path::Path::new(candidate).exists() {
             return candidate.into();

src-tauri/src/services/gist_sync.rs

@@ -682,7 +682,12 @@ pub fn apply_pulled_payload(
                             }
                             // Back up existing file before overwriting
                             if claude_md_path.exists() {
-                                let backup = claude_md_path.with_extension("md.bak");
+                                let file_name = claude_md_path
+                                    .file_name()
+                                    .unwrap_or_default()
+                                    .to_string_lossy();
+                                let backup =
+                                    claude_md_path.with_file_name(format!("{}.bak", file_name));
                                 let _ = std::fs::copy(&claude_md_path, &backup);
                             }
                             if let Err(e) = std::fs::write(&claude_md_path, content) {