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/e2e/helpers/app.ts

@@ -156,7 +156,9 @@ async function assertE2EUsesSeededTestDaemon(page: Page): Promise<void> {
     }
   } catch (error) {
     if (error instanceof Error) throw error;
-    throw new Error("E2E expected @paseo:create-agent-preferences to be valid JSON.");
+    throw new Error("E2E expected @paseo:create-agent-preferences to be valid JSON.", {
+      cause: error,
+    });
   }
 }