feat(server,web): page the cost center's error table, abbreviate the source, drop command-tool noise (#103)

Co-authored-by: Claude Opus 5 (1M context) <noreply@anthropic.com>

packages/server/test/id-validation.test.ts

@@ -97,6 +97,7 @@ describe("id-validation", () => {
     expect((await attacker.get(`/api/projects/..%2Fetc/agents`)).status).toBe(404);
     expect((await attacker.get(`/api/projects/..%2Fetc/models`)).status).toBe(404);
     expect((await attacker.get(`/api/projects/..%2Fetc/usage`)).status).toBe(404);
+    expect((await attacker.get(`/api/projects/..%2Fetc/usage/errors`)).status).toBe(404);
     expect((await attacker.get(`/api/projects/..%2Fetc/members`)).status).toBe(404);
     expect((await attacker.delete(`/api/projects/..%2F${victimProject}`)).status).toBe(404);
   });