Replace String() calls with .toString()/.toLocaleString() per ast-grep rule

- Add formatError() helper in CLI to safely handle unknown error types
- Add uniqueTestId() helper for generating unique test identifiers
- Replace String(id) with id.toString() for database ID conversions
- Replace String(n) with n.toLocaleString() for user-facing number formatting
- Fix TypeScript errors in test files (undefined checks, unused variables)
- Update lint commands to include ast-grep scanning

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/cli/src/routes/bootstrap.ts

@@ -2,6 +2,7 @@ import type { LocalContext } from "../context.js";
 import { createDb, executeBootstrap } from "@reviq/db";
 import { buildCommand } from "@stricli/core";
 import { writeConfig } from "../utils/config.js";
+import { formatError } from "../utils/format-error.js";
 
 interface BootstrapFlags {
   email: string;
@@ -47,10 +48,7 @@ async function bootstrap(
 
     await db.destroy();
   } catch (error) {
-    console.error(
-      "Error:",
-      error instanceof Error ? error.message : String(error),
-    );
+    console.error("Error:", formatError(error));
     await db.destroy();
     this.process.exit(1);
   }