chore: unify code formatting and remove unused code

- Apply cargo fmt to Rust code with multiline error handling
- Apply Prettier formatting to TypeScript code with trailing commas
- Unify #[allow(non_snake_case)] attribute formatting
- Remove unused ProviderNotFound error variant from error.rs
- Add vitest-report.json to .gitignore to exclude test artifacts
- Optimize readability of error handling chains with vertical alignment

All tests passing: 22 Rust tests + 126 frontend tests

src/lib/api/usage.ts

@@ -33,7 +33,7 @@ export const usageApi = {
     scriptCode: string,
     timeout?: number,
     accessToken?: string,
-    userId?: string
+    userId?: string,
   ): Promise<UsageResult> {
     try {
       return await invoke("testUsageScript", {