fix(login): a denied device request says how to recover; pin @types/node majors

.github/dependabot.yml

@@ -11,6 +11,17 @@ updates:
     groups:
       development-toolchain:
         dependency-type: development
+    ignore:
+      # @types/node must track the runtime floor in package.json (engines.node
+      # ">=24"), not the newest release. A major bump types the project against
+      # a Node it does not claim to support, so tsc starts accepting APIs that
+      # do not exist for users on the supported version — a type error that only
+      # surfaces at their runtime. test/migration_guard.ts asserts that pairing,
+      # so a major bump lands as red CI on main; #52 did exactly that and main
+      # stayed broken until it was reverted. Minor and patch updates still flow.
+      # Raise this deliberately, together with engines.node, when the floor moves.
+      - dependency-name: '@types/node'
+        update-types: ['version-update:semver-major']
 
   - package-ecosystem: github-actions
     directory: /

src/core/device.ts

@@ -99,7 +99,22 @@ export async function pollForToken(
     }
     const action = classifyPoll(resp);
     if (action === "ready") return resp.access_token as string;
-    if (action === "denied") throw new Error("authorization denied in the browser");
+    // Denial is RECOVERABLE, and "authorization denied in the browser" said
+    // neither that nor what to do next — it read like a verdict on the account.
+    // It also matters that a denial is not necessarily the user's own: any
+    // signed-in account that learns a user_code can refuse it, so a denial the
+    // user did not perform means their code reached someone else.
+    //
+    // Kept to ONE line on purpose: this is rendered by formatErrorLine, which
+    // puts its glyph on the first line only — a multi-line message loses the
+    // glyph on every line after the first.
+    if (action === "denied") {
+      throw new Error(
+        "authorization denied — nothing was authorized and no key was created. " +
+          "Run `aether auth login` again to retry; if you didn't deny it, " +
+          "someone else has your login code — don't share it.",
+      );
+    }
     if (action === "expired") throw new Error("login timed out — run `aether auth login` again");
     if (action === "slow_down") interval += 5;
   }