fix(auth): use full-page navigation after sign-in to prevent stale dashboard

router.refresh() + router.push() left the React tree (incl. QueryClient
with staleTime: 60_000 and cached pre-auth query errors) and the Next.js
Router Cache alive across the login boundary. This caused the recurring
bug where the dashboard rendered with empty widgets until the user
pressed Ctrl+R. A full-page navigation guarantees a fresh server request
with the new session cookie and a clean client state.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

apps/web/src/app/auth/signin/page.tsx

@@ -59,10 +59,15 @@ export default function SignInPage() {
         setTotp("");
       }
     } else {
-      // Invalidate the Next.js Router Cache so (app)/layout.tsx re-renders
-      // with the fresh session, then navigate to the dashboard.
-      router.refresh();
-      router.push("/dashboard");
+      // Full-page navigation instead of router.push to guarantee a fresh
+      // server request with the new session cookie. Soft navigation keeps
+      // the React tree (incl. QueryClient with cached pre-auth errors and
+      // the Next.js Router Cache) alive, which caused the recurring bug
+      // where the dashboard rendered with empty widgets until the user
+      // pressed Ctrl+R. Skipping setLoading(false) prevents a visual flash
+      // while the navigation happens.
+      window.location.assign("/dashboard");
+      return;
     }
 
     setLoading(false);
@@ -86,21 +91,28 @@ export default function SignInPage() {
               Resource planning that stays readable under pressure.
             </h1>
             <p className="mt-5 max-w-xl text-lg text-gray-600 dark:text-gray-300">
-              Estimates, staffing, chargeability, and timelines in one workspace with sharper structure for day-to-day planning.
+              Estimates, staffing, chargeability, and timelines in one workspace with sharper
+              structure for day-to-day planning.
             </p>
           </div>
           <div className="grid gap-4 sm:grid-cols-3">
             <div className="app-surface p-5">
               <p className="app-label">Visibility</p>
-              <p className="text-sm text-gray-700 dark:text-gray-300">Clearer data density, stronger contrast, faster scanning.</p>
+              <p className="text-sm text-gray-700 dark:text-gray-300">
+                Clearer data density, stronger contrast, faster scanning.
+              </p>
             </div>
             <div className="app-surface p-5">
               <p className="app-label">Planning</p>
-              <p className="text-sm text-gray-700 dark:text-gray-300">Dynamic staffing, resources, and chargeability in one flow.</p>
+              <p className="text-sm text-gray-700 dark:text-gray-300">
+                Dynamic staffing, resources, and chargeability in one flow.
+              </p>
             </div>
             <div className="app-surface p-5">
               <p className="app-label">Control</p>
-              <p className="text-sm text-gray-700 dark:text-gray-300">Theme-aware UI that works in bright and dark environments.</p>
+              <p className="text-sm text-gray-700 dark:text-gray-300">
+                Theme-aware UI that works in bright and dark environments.
+              </p>
             </div>
           </div>
         </div>
@@ -108,7 +120,9 @@ export default function SignInPage() {
         <div className="w-full max-w-md lg:ml-auto lg:max-w-lg">
           <div className="app-surface-strong p-8">
             <div className="mb-8">
-              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-brand-600">Welcome Back</p>
+              <p className="text-xs font-semibold uppercase tracking-[0.18em] text-brand-600">
+                Welcome Back
+              </p>
               <h2 className="mt-3 font-display text-4xl font-semibold text-gray-900 dark:text-gray-50">
                 {mfaRequired ? "Two-Factor Authentication" : "Sign in to CapaKraken"}
               </h2>
@@ -189,7 +203,8 @@ export default function SignInPage() {
                     required
                   />
                   <p className="mt-2 text-xs text-gray-500 dark:text-gray-400">
-                    Open your authenticator app (e.g. Google Authenticator, Authy) and enter the current code.
+                    Open your authenticator app (e.g. Google Authenticator, Authy) and enter the
+                    current code.
                   </p>
                 </div>
               )}
@@ -212,7 +227,6 @@ export default function SignInPage() {
                 </button>
               )}
             </form>
-
           </div>
         </div>
       </div>