chore: apply oxlint autofix (safe level)

Auto-fixed 102 warnings (6040 → 5938) across 57 files. Main categories:
- preserve-caught-error: add { cause: error } to re-thrown errors
- unicorn/no-array-reverse: .reverse() → .toReversed()
- unicorn/no-useless-fallback-in-spread: drop unnecessary ?? {} in spreads
- oxc/no-map-spread: rewrite object spread in .map() to Object.assign
- react-hooks/exhaustive-deps: trim module-level constants from dep arrays

Ran npm run format after to clean up whitespace from lint mutations.

packages/app/src/components/file-explorer-pane.tsx

@@ -287,14 +287,14 @@ export function FileExplorerPane({
         directoryPaths.unshift(".");
       }
 
-      await Promise.all([
-        ...directoryPaths.map((path) =>
+      await Promise.all(
+        directoryPaths.map((path) =>
           requestDirectoryListing(path, {
             recordHistory: false,
             setCurrentPath: false,
           }),
         ),
-      ]);
+      );
       return null;
     },
     enabled: false,