feat(settings): default landing page (plan Tier 6)

- New per-user 'default_landing_page' setting (tracker default / calendar /
  summary / spending), registered in the whitelist + defaults.
- Implemented as a post-login redirect (keeps /=Tracker so the Home link and
  direct nav are unaffected). Precedence: admin → deep-link they were bounced
  from (state.from) → default landing → /. Resolved by fetching settings in the
  login success path, with a safe / fallback so a fetch failure never blocks login.
- Settings: Select in the Regional section.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/pages/LoginPage.tsx

@@ -1,5 +1,5 @@
 import { useState, useEffect } from 'react';
-import { Link, useNavigate } from 'react-router-dom';
+import { Link, useNavigate, useLocation } from 'react-router-dom';
 import { toast } from 'sonner';
 import { api } from '@/api';
 import { errMessage } from '@/lib/utils';
@@ -22,8 +22,13 @@ interface AuthModeInfo {
   oidc_provider_name?: string;
 }
 
+const LANDING_ROUTES: Record<string, string> = {
+  tracker: '/', calendar: '/calendar', summary: '/summary', spending: '/spending',
+};
+
 export default function LoginPage() {
   const navigate = useNavigate();
+  const location = useLocation();
   const { setUser, refresh } = useAuth();
 
   const [username, setUsername] = useState('');
@@ -49,6 +54,24 @@ export default function LoginPage() {
 
   const destFor = (user?: User | null) => (user?.is_default_admin ? '/admin' : '/');
 
+  // Where to send the user after signing in. Precedence: admin console →
+  // explicit deep-link they were bounced from → their default landing page → /.
+  const resolveDest = async (user?: User | null): Promise<string> => {
+    if (user?.is_default_admin) return '/admin';
+    const from = (location.state as { from?: { pathname?: string } } | null)?.from?.pathname;
+    if (from && from !== '/login') return from;
+    try {
+      const s = (await api.settings()) as Record<string, unknown>;
+      const landing = typeof s.default_landing_page === 'string' ? LANDING_ROUTES[s.default_landing_page] : undefined;
+      return landing || '/';
+    } catch {
+      return '/'; // never block login on a settings-fetch failure
+    }
+  };
+  const navigateAfterAuth = async (user?: User | null) => {
+    navigate(await resolveDest(user), { replace: true });
+  };
+
   useEffect(() => {
     api.authMode()
       .then(raw => {
@@ -77,7 +100,7 @@ export default function LoginPage() {
       setShowPrivacy(true);
       setShowChangePw(false);
     } else {
-      navigate(destFor(user), { replace: true });
+      void navigateAfterAuth(user);
     }
   };
 
@@ -148,7 +171,7 @@ export default function LoginPage() {
       if (pendingUser?.first_login) {
         setShowPrivacy(true);
       } else {
-        navigate(destFor(pendingUser), { replace: true });
+        void navigateAfterAuth(pendingUser);
       }
     } catch (err) {
       toast.error(errMessage(err, 'Failed to change password.'));
@@ -164,7 +187,7 @@ export default function LoginPage() {
 
     refresh();
     setShowPrivacy(false);
-    navigate(destFor(pendingUser), { replace: true });
+    void navigateAfterAuth(pendingUser);
   };
 
   return (

client/pages/SettingsPage.tsx

@@ -315,6 +315,7 @@ interface SettingsState {
   currency: string;
   date_format: string;
   week_start: string;
+  default_landing_page: string;
   grace_period_days: number | string;
   due_soon_days: number | string;
   drift_threshold_pct: string;
@@ -335,6 +336,7 @@ export default function SettingsPage() {
     currency:              'USD',
     date_format:           'MM/DD/YYYY',
     week_start:            '0',
+    default_landing_page:  'tracker',
     grace_period_days:     5,
     due_soon_days:         3,
     drift_threshold_pct:   '5',
@@ -368,6 +370,7 @@ export default function SettingsPage() {
     currency: s.currency,
     date_format: s.date_format,
     week_start: s.week_start,
+    default_landing_page: s.default_landing_page,
     grace_period_days: s.grace_period_days,
     due_soon_days: s.due_soon_days,
     drift_threshold_pct: s.drift_threshold_pct,
@@ -494,6 +497,20 @@ export default function SettingsPage() {
             </SelectContent>
           </Select>
         </SettingRow>
+
+        <SettingRow label="Default landing page" description="Where you land right after signing in.">
+          <Select value={settings.default_landing_page} onValueChange={(v) => set('default_landing_page', v)}>
+            <SelectTrigger className="w-48">
+              <SelectValue />
+            </SelectTrigger>
+            <SelectContent>
+              <SelectItem value="tracker">Tracker</SelectItem>
+              <SelectItem value="calendar">Calendar</SelectItem>
+              <SelectItem value="summary">Summary</SelectItem>
+              <SelectItem value="spending">Spending</SelectItem>
+            </SelectContent>
+          </Select>
+        </SettingRow>
       </SectionCard>
 
       {/* Tracker Layout */}

services/userSettings.js

@@ -6,6 +6,7 @@ const USER_SETTING_KEYS = [
   'currency',
   'date_format',
   'week_start',
+  'default_landing_page',
   'grace_period_days',
   'due_soon_days',
   'notify_days_before',
@@ -32,6 +33,7 @@ const USER_SETTING_KEYS = [
 
 const USER_SETTING_DEFAULTS = {
   week_start: '0',
+  default_landing_page: 'tracker',
   due_soon_days: '3',
   search_bars_collapsed: 'false',
   bank_auto_categorize_merchants: 'true',