fix(headless-login): show full parsed jwks key values

- return the full RSA n value in parsedKeys responses
- render parsed key fields with labels and multiline key material in DevFront
- lock the behavior with backend and Playwright regression tests

devfront/tests/devfront-clients-lifecycle.spec.ts

@@ -149,8 +149,8 @@ test.describe("DevFront clients lifecycle", () => {
                 kty: "RSA",
                 use: "sig",
                 alg: "RS256",
-                nPreview:
-                  "voVbHlo_UHkj...Hb8PiTCQ",
+                n:
+                  "voVbHlo_UHkjtT7Q_8owyjZ2omE8n8mbGlpraZziStHPfe08q_RGiEXO6Pyiz42NVi-Yo0c7qiaqRwB4h9s5phpT2wwcUxnkrQeRhe7BpigInZPzpwq1hsaB2zyhE7zTRCC3hinGtFdVpNzTVKYKGPbXfeEXaRL3P838vi-_iB4IN3WQk_pAakUQvajL2H-vcWSMSNslMGPDZxobqE9MHSWocNXemrcmtCeE7ruUND0qHZOb8k-hHUBqsNoJ63WKdapzGYF6e2qgDRveYrjgOCBigZPi8npN0xStQ0YcrH_RxeTogsdRZ8SuXmLqavryVDnrT8czPkkJ-EHb8PiTCQ",
               },
             ],
           },
@@ -211,6 +211,7 @@ test.describe("DevFront clients lifecycle", () => {
       page.getByText(/cached at|캐시됨|last refresh|마지막 갱신/i),
     ).toBeVisible();
     await expect(page.getByText(/Parsed Keys|파싱된 키/i)).toBeVisible();
+    await expect(page.getByText(/^KID$/i)).toBeVisible();
     await expect(page.getByText("kid-1", { exact: true }).last()).toBeVisible();
     await expect(
       page.getByText(/Allowed algorithms|허용 알고리즘/i),
@@ -230,7 +231,10 @@ test.describe("DevFront clients lifecycle", () => {
       await expect(page.getByText(algorithm, { exact: true }).last()).toBeVisible();
     }
     await expect(
-      page.getByText("voVbHlo_UHkj...Hb8PiTCQ", { exact: true }),
+      page.getByText(
+        "voVbHlo_UHkjtT7Q_8owyjZ2omE8n8mbGlpraZziStHPfe08q_RGiEXO6Pyiz42NVi-Yo0c7qiaqRwB4h9s5phpT2wwcUxnkrQeRhe7BpigInZPzpwq1hsaB2zyhE7zTRCC3hinGtFdVpNzTVKYKGPbXfeEXaRL3P838vi-_iB4IN3WQk_pAakUQvajL2H-vcWSMSNslMGPDZxobqE9MHSWocNXemrcmtCeE7ruUND0qHZOb8k-hHUBqsNoJ63WKdapzGYF6e2qgDRveYrjgOCBigZPi8npN0xStQ0YcrH_RxeTogsdRZ8SuXmLqavryVDnrT8czPkkJ-EHb8PiTCQ",
+        { exact: true },
+      ),
     ).toBeVisible();
     await expect(
       page.getByRole("button", { name: /refresh|새로고침/i }),

devfront/tests/helpers/devfront-fixtures.ts

@@ -33,7 +33,7 @@ export type Client = {
       kty?: string;
       use?: string;
       alg?: string;
-      nPreview?: string;
+      n?: string;
     }>;
   };
   metadata?: Record<string, unknown>;