diff --git a/app/(app)/_layout.tsx b/app/(app)/_layout.tsx
index a49528b..d676301 100644
--- a/app/(app)/_layout.tsx
+++ b/app/(app)/_layout.tsx
@@ -31,7 +31,7 @@ export default function AppLayout() {
         disableTransparentOnScrollEdge
         backgroundColor={Platform.OS === "android" ? colors.background : undefined}
       >
-        <NativeTabs.Trigger name="index" disableAutomaticContentInsets contentStyle={tabContentStyle}>
+        <NativeTabs.Trigger name="index" contentStyle={tabContentStyle} disableAutomaticContentInsets>
           <NativeTabs.Trigger.Icon
             sf={{ default: "square.grid.2x2", selected: "square.grid.2x2.fill" }}
             md="grid_view"
@@ -39,7 +39,7 @@ export default function AppLayout() {
           <NativeTabs.Trigger.Label>Dashboard</NativeTabs.Trigger.Label>
         </NativeTabs.Trigger>
 
-        <NativeTabs.Trigger name="timer" disableAutomaticContentInsets contentStyle={tabContentStyle}>
+        <NativeTabs.Trigger name="timer" contentStyle={tabContentStyle} disableAutomaticContentInsets>
           <NativeTabs.Trigger.Icon
             sf={{ default: "timer", selected: "timer" }}
             md="timer"
@@ -47,7 +47,7 @@ export default function AppLayout() {
           <NativeTabs.Trigger.Label>Timer</NativeTabs.Trigger.Label>
         </NativeTabs.Trigger>
 
-        <NativeTabs.Trigger name="entities" disableAutomaticContentInsets contentStyle={tabContentStyle}>
+        <NativeTabs.Trigger name="entities" contentStyle={tabContentStyle} disableAutomaticContentInsets>
           <NativeTabs.Trigger.Icon
             sf={{ default: "square.stack.3d.up", selected: "square.stack.3d.up.fill" }}
             md="corporate_fare"
@@ -55,7 +55,7 @@ export default function AppLayout() {
           <NativeTabs.Trigger.Label>Entities</NativeTabs.Trigger.Label>
         </NativeTabs.Trigger>
 
-        <NativeTabs.Trigger name="invoices" disableAutomaticContentInsets contentStyle={tabContentStyle}>
+        <NativeTabs.Trigger name="invoices" contentStyle={tabContentStyle} disableAutomaticContentInsets>
           <NativeTabs.Trigger.Icon
             sf={{ default: "doc.text", selected: "doc.text.fill" }}
             md="description"
@@ -63,7 +63,7 @@ export default function AppLayout() {
           <NativeTabs.Trigger.Label>Invoices</NativeTabs.Trigger.Label>
         </NativeTabs.Trigger>
 
-        <NativeTabs.Trigger name="settings" disableAutomaticContentInsets contentStyle={tabContentStyle}>
+        <NativeTabs.Trigger name="settings" contentStyle={tabContentStyle} disableAutomaticContentInsets>
           <NativeTabs.Trigger.Icon
             sf={{ default: "gearshape", selected: "gearshape.fill" }}
             md="settings"
diff --git a/app/(app)/settings.tsx b/app/(app)/settings.tsx
index 0f5b7e8..bf4d301 100644
--- a/app/(app)/settings.tsx
+++ b/app/(app)/settings.tsx
@@ -18,6 +18,7 @@ import { useAccounts } from "@/contexts/AccountsContext";
 import { useAppLock } from "@/contexts/AppLockContext";
 import { useAuthClient, useSession } from "@/contexts/AuthContext";
 import { type ColorMode, useAppTheme } from "@/contexts/ThemeContext";
+import { startAdditionalAccountSignIn } from "@/lib/add-account";
 import { api } from "@/lib/trpc";
 
 const THEME_OPTIONS: { value: ColorMode; label: string }[] = [
@@ -251,11 +252,7 @@ export default function SettingsScreen() {
             <Button
               title="Add another account"
               variant="secondary"
-              onPress={async () => {
-                await authClient.signOut();
-                await clearActiveAccount();
-                router.replace("/(auth)/sign-in");
-              }}
+              onPress={() => void startAdditionalAccountSignIn(clearActiveAccount)}
             />
             {accounts.length > 1 ? (
               <Text style={[styles.meta, { color: colors.mutedForeground }]}>
@@ -336,6 +333,19 @@ export default function SettingsScreen() {
             </View>
           </Card>
 
+          <Card title="App">
+            <View style={styles.appRow}>
+              <Text style={[styles.meta, { color: colors.mutedForeground }]}>Version</Text>
+              <Text style={[styles.appValue, { color: colors.foreground }]}>{appVersion}</Text>
+            </View>
+            <View style={styles.appRow}>
+              <Text style={[styles.meta, { color: colors.mutedForeground }]}>Platform</Text>
+              <Text style={[styles.appValue, { color: colors.foreground }]}>
+                {Constants.platform?.ios ? "iOS" : "Other"}
+              </Text>
+            </View>
+          </Card>
+
           <Pressable
             accessibilityRole="button"
             accessibilityState={{ expanded: showAdvanced }}
@@ -359,19 +369,6 @@ export default function SettingsScreen() {
             </Card>
           ) : null}
 
-          <Card title="App">
-            <View style={styles.appRow}>
-              <Text style={[styles.meta, { color: colors.mutedForeground }]}>Version</Text>
-              <Text style={[styles.appValue, { color: colors.foreground }]}>{appVersion}</Text>
-            </View>
-            <View style={styles.appRow}>
-              <Text style={[styles.meta, { color: colors.mutedForeground }]}>Platform</Text>
-              <Text style={[styles.appValue, { color: colors.foreground }]}>
-                {Constants.platform?.ios ? "iOS" : "Other"}
-              </Text>
-            </View>
-          </Card>
-
           <View style={styles.actions}>
             <Button title="Sign Out" variant="danger" onPress={confirmSignOut} />
           </View>
diff --git a/app/(auth)/register.tsx b/app/(auth)/register.tsx
index bf0cdcb..6a74f48 100644
--- a/app/(auth)/register.tsx
+++ b/app/(auth)/register.tsx
@@ -20,7 +20,7 @@ import { useAccounts } from "@/contexts/AccountsContext";
 import { useAuthClient } from "@/contexts/AuthContext";
 import { useAppTheme } from "@/contexts/ThemeContext";
 import { registerAccount } from "@/lib/auth-api";
-import { finalizeAuthenticatedAccount } from "@/lib/auth-storage";
+import { completeSignInAfterAuth } from "@/lib/complete-sign-in";
 import { isRequiredString, isValidEmail, isValidPassword, useFieldVisibility } from "@/lib/form-validation";
 
 export default function RegisterScreen() {
@@ -82,11 +82,8 @@ export default function RegisterScreen() {
       const session = await authClient.getSession();
       const user = session.data?.user;
       if (user) {
-        await finalizeAuthenticatedAccount({
+        await completeSignInAfterAuth(authClient, {
           apiUrl,
-          userId: user.id,
-          email: user.email,
-          name: user.name,
           activeAccountId,
           registerAccount: saveAccount,
         });
@@ -109,15 +106,17 @@ export default function RegisterScreen() {
             contentContainerStyle={styles.container}
             keyboardShouldPersistTaps="handled"
           >
-            <AuthServerPicker onReadyChange={setServerReady} />
-            <Card style={styles.card}>
-              <View style={styles.header}>
-                <Logo size="lg" />
-                <HeadingText style={styles.title}>Create your account</HeadingText>
-                <Text style={[styles.subtitle, { color: colors.mutedForeground }]}>
-                  Get started today
-                </Text>
-              </View>
+            <View style={styles.content}>
+              <Card style={styles.card}>
+                <View style={styles.header}>
+                  <Logo size="lg" />
+                  <HeadingText style={styles.title}>Create your account</HeadingText>
+                  <Text style={[styles.subtitle, { color: colors.mutedForeground }]}>
+                    Get started today
+                  </Text>
+                </View>
+
+                <AuthServerPicker onReadyChange={setServerReady} embedded />
 
               <View style={styles.form}>
                 <View style={styles.row}>
@@ -190,6 +189,7 @@ export default function RegisterScreen() {
                 </Link>
               </Text>
             </Card>
+            </View>
           </ScrollView>
         </KeyboardAvoidingView>
       </FullScreen>
@@ -203,17 +203,30 @@ const styles = StyleSheet.create({
   container: {
     flexGrow: 1,
     justifyContent: "center",
+    alignItems: "center",
     padding: spacing.lg,
-    paddingBottom: spacing.md,
+    paddingVertical: spacing.xl,
+  },
+  content: {
+    width: "100%",
+    maxWidth: 420,
   },
   card: {
     gap: spacing.lg,
   },
-  header: { gap: spacing.sm },
-  title: { fontSize: 24, marginTop: spacing.sm },
+  header: {
+    alignItems: "center",
+    gap: spacing.sm,
+  },
+  title: {
+    fontSize: 24,
+    marginTop: spacing.sm,
+    textAlign: "center",
+  },
   subtitle: {
     fontSize: 14,
     fontFamily: fonts.body,
+    textAlign: "center",
   },
   form: { gap: spacing.md },
   row: { flexDirection: "row", gap: spacing.md },
diff --git a/app/(auth)/sign-in.tsx b/app/(auth)/sign-in.tsx
index a75cd9e..d77873b 100644
--- a/app/(auth)/sign-in.tsx
+++ b/app/(auth)/sign-in.tsx
@@ -1,5 +1,6 @@
 import { Link, router } from "expo-router";
-import { useState } from "react";
+import * as Linking from "expo-linking";
+import { useEffect, useState } from "react";
 import {
   KeyboardAvoidingView,
   Platform,
@@ -20,7 +21,9 @@ import { fonts, spacing } from "@/constants/theme";
 import { useAccounts } from "@/contexts/AccountsContext";
 import { useAuthClient } from "@/contexts/AuthContext";
 import { useAppTheme } from "@/contexts/ThemeContext";
-import { finalizeAuthenticatedAccount } from "@/lib/auth-storage";
+import { fetchAuthCapabilities } from "@/lib/auth-capabilities";
+import { signInWithAuthentik } from "@/lib/auth-oauth";
+import { completeSignInAfterAuth } from "@/lib/complete-sign-in";
 import { isRequiredString, isValidEmail, useFieldVisibility } from "@/lib/form-validation";
 
 export default function SignInScreen() {
@@ -32,8 +35,24 @@ export default function SignInScreen() {
   const [error, setError] = useState<string | null>(null);
   const [loading, setLoading] = useState(false);
   const [serverReady, setServerReady] = useState(true);
+  const [authentikEnabled, setAuthentikEnabled] = useState(false);
+  const [signupsDisabled, setSignupsDisabled] = useState(false);
   const { touch, visible, markSubmitted } = useFieldVisibility();
 
+  useEffect(() => {
+    let cancelled = false;
+
+    void fetchAuthCapabilities(apiUrl).then((capabilities) => {
+      if (cancelled) return;
+      setAuthentikEnabled(capabilities.authentik);
+      setSignupsDisabled(capabilities.signupsDisabled);
+    });
+
+    return () => {
+      cancelled = true;
+    };
+  }, [apiUrl]);
+
   const emailValidationError = !email.trim()
     ? "Email is required"
     : isValidEmail(email)
@@ -42,6 +61,18 @@ export default function SignInScreen() {
   const passwordValidationError = password.trim() ? undefined : "Password is required";
   const canSignIn = isValidEmail(email) && isRequiredString(password) && serverReady;
 
+  async function finishSignIn() {
+    const completed = await completeSignInAfterAuth(authClient, {
+      apiUrl,
+      activeAccountId,
+      registerAccount,
+    });
+
+    if (!completed) {
+      setError("Signed in but session was not available. Try again.");
+    }
+  }
+
   async function handleSignIn() {
     markSubmitted();
     if (!canSignIn) return;
@@ -64,18 +95,29 @@ export default function SignInScreen() {
         return;
       }
 
-      const session = await authClient.getSession();
-      const user = session.data?.user;
-      if (user) {
-        await finalizeAuthenticatedAccount({
-          apiUrl,
-          userId: user.id,
-          email: user.email,
-          name: user.name,
-          activeAccountId,
-          registerAccount,
-        });
+      await finishSignIn();
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function handleAuthentikSignIn() {
+    if (!serverReady) return;
+    setError(null);
+    setLoading(true);
+
+    try {
+      const { error: oauthError } = await signInWithAuthentik(
+        authClient,
+        Linking.createURL("/"),
+      );
+
+      if (oauthError) {
+        setError(oauthError.message ?? "Could not sign in with Authentik");
+        return;
       }
+
+      await finishSignIn();
     } finally {
       setLoading(false);
     }
@@ -92,66 +134,96 @@ export default function SignInScreen() {
             contentContainerStyle={styles.container}
             keyboardShouldPersistTaps="handled"
           >
-            <AuthServerPicker onReadyChange={setServerReady} />
-            <Card style={styles.card}>
-              <View style={styles.header}>
-                <Logo size="lg" />
-                <HeadingText style={styles.title}>Welcome back</HeadingText>
-                <Text style={[styles.subtitle, { color: colors.mutedForeground }]}>
-                  Sign in to manage invoices on the go
-                </Text>
-              </View>
-
-              <View style={styles.form}>
-                <Input
-                  label="Email"
-                  autoCapitalize="none"
-                  autoComplete="email"
-                  keyboardType="email-address"
-                  value={email}
-                  onChangeText={setEmail}
-                  onBlur={() => touch("email")}
-                  placeholder="you@example.com"
-                  required
-                  error={visible("email") ? emailValidationError : undefined}
-                />
-                <Input
-                  label="Password"
-                  secureTextEntry
-                  autoComplete="password"
-                  value={password}
-                  onChangeText={setPassword}
-                  onBlur={() => touch("password")}
-                  placeholder="••••••••"
-                  required
-                  error={visible("password") ? passwordValidationError : undefined}
-                />
-
-                <Pressable onPress={() => router.push("/(auth)/forgot-password")}>
-                  <Text style={[styles.forgot, { color: colors.mutedForeground }]}>
-                    Forgot password?
+            <View style={styles.content}>
+              <Card style={styles.card}>
+                <View style={styles.header}>
+                  <Logo size="lg" />
+                  <HeadingText style={styles.title}>Welcome back</HeadingText>
+                  <Text style={[styles.subtitle, { color: colors.mutedForeground }]}>
+                    Sign in to manage invoices on the go
                   </Text>
-                </Pressable>
+                </View>
 
-                {error ? (
-                  <Text style={[styles.error, { color: colors.destructive }]}>{error}</Text>
+                <AuthServerPicker onReadyChange={setServerReady} embedded />
+
+                {signupsDisabled ? (
+                  <Text style={[styles.notice, { color: colors.mutedForeground }]}>
+                    New account registration is currently disabled on this server.
+                  </Text>
                 ) : null}
 
-                <Button
-                  title="Sign In"
-                  loading={loading}
-                  disabled={!canSignIn}
-                  onPress={handleSignIn}
-                />
-              </View>
+                {authentikEnabled ? (
+                  <View style={styles.ssoSection}>
+                    <Button
+                      title="Sign in with Authentik"
+                      variant="secondary"
+                      loading={loading}
+                      disabled={!serverReady}
+                      onPress={() => void handleAuthentikSignIn()}
+                    />
+                    <View style={styles.dividerRow}>
+                      <View style={[styles.dividerLine, { backgroundColor: colors.border }]} />
+                      <Text style={[styles.dividerLabel, { color: colors.mutedForeground }]}>
+                        or
+                      </Text>
+                      <View style={[styles.dividerLine, { backgroundColor: colors.border }]} />
+                    </View>
+                  </View>
+                ) : null}
 
-              <Text style={[styles.footer, { color: colors.mutedForeground }]}>
-                Don&apos;t have an account?{" "}
-                <Link href="/(auth)/register" style={[styles.link, { color: colors.foreground }]}>
-                  Create one
-                </Link>
-              </Text>
-            </Card>
+                <View style={styles.form}>
+                  <Input
+                    label="Email"
+                    autoCapitalize="none"
+                    autoComplete="email"
+                    keyboardType="email-address"
+                    value={email}
+                    onChangeText={setEmail}
+                    onBlur={() => touch("email")}
+                    placeholder="you@example.com"
+                    required
+                    error={visible("email") ? emailValidationError : undefined}
+                  />
+                  <Input
+                    label="Password"
+                    secureTextEntry
+                    autoComplete="password"
+                    value={password}
+                    onChangeText={setPassword}
+                    onBlur={() => touch("password")}
+                    placeholder="••••••••"
+                    required
+                    error={visible("password") ? passwordValidationError : undefined}
+                  />
+
+                  <Pressable onPress={() => router.push("/(auth)/forgot-password")}>
+                    <Text style={[styles.forgot, { color: colors.mutedForeground }]}>
+                      Forgot password?
+                    </Text>
+                  </Pressable>
+
+                  {error ? (
+                    <Text style={[styles.error, { color: colors.destructive }]}>{error}</Text>
+                  ) : null}
+
+                  <Button
+                    title="Sign In"
+                    loading={loading}
+                    disabled={!canSignIn}
+                    onPress={handleSignIn}
+                  />
+                </View>
+
+                {!signupsDisabled ? (
+                  <Text style={[styles.footer, { color: colors.mutedForeground }]}>
+                    Don&apos;t have an account?{" "}
+                    <Link href="/(auth)/register" style={[styles.link, { color: colors.foreground }]}>
+                      Create one
+                    </Link>
+                  </Text>
+                ) : null}
+              </Card>
+            </View>
           </ScrollView>
         </KeyboardAvoidingView>
       </FullScreen>
@@ -169,22 +241,54 @@ const styles = StyleSheet.create({
   container: {
     flexGrow: 1,
     justifyContent: "center",
+    alignItems: "center",
     padding: spacing.lg,
-    paddingBottom: spacing.md,
+    paddingVertical: spacing.xl,
+  },
+  content: {
+    width: "100%",
+    maxWidth: 420,
   },
   card: {
     gap: spacing.lg,
   },
   header: {
+    alignItems: "center",
     gap: spacing.sm,
   },
   title: {
     fontSize: 24,
     marginTop: spacing.sm,
+    textAlign: "center",
   },
   subtitle: {
     fontSize: 14,
     fontFamily: fonts.body,
+    textAlign: "center",
+  },
+  notice: {
+    fontSize: 13,
+    fontFamily: fonts.body,
+    textAlign: "center",
+    lineHeight: 18,
+  },
+  ssoSection: {
+    gap: spacing.md,
+  },
+  dividerRow: {
+    flexDirection: "row",
+    alignItems: "center",
+    gap: spacing.sm,
+  },
+  dividerLine: {
+    flex: 1,
+    height: StyleSheet.hairlineWidth,
+  },
+  dividerLabel: {
+    fontSize: 12,
+    fontFamily: fonts.bodyMedium,
+    textTransform: "uppercase",
+    letterSpacing: 0.6,
   },
   form: {
     gap: spacing.md,
diff --git a/components/AccountSwitcher.tsx b/components/AccountSwitcher.tsx
index 84dd852..5447420 100644
--- a/components/AccountSwitcher.tsx
+++ b/components/AccountSwitcher.tsx
@@ -1,5 +1,4 @@
 import { Ionicons } from "@expo/vector-icons";
-import { router } from "expo-router";
 import { useState } from "react";
 import {
   Modal,
@@ -12,7 +11,8 @@ import {
 
 import { fonts, radii, spacing } from "@/constants/theme";
 import { useAccounts } from "@/contexts/AccountsContext";
-import { useAuthClient, useSession } from "@/contexts/AuthContext";
+import { useSession } from "@/contexts/AuthContext";
+import { startAdditionalAccountSignIn } from "@/lib/add-account";
 import { useAppTheme } from "@/contexts/ThemeContext";
 import { formatServerHost } from "@/lib/server-mode";
 
@@ -34,7 +34,6 @@ function displayName(name: string, email: string) {
 /** Header control to switch signed-in accounts or add another. */
 export function AccountSwitcher() {
   const { colors } = useAppTheme();
-  const authClient = useAuthClient();
   const { data: session } = useSession();
   const {
     accounts,
@@ -56,9 +55,7 @@ export function AccountSwitcher() {
 
   async function handleAddAccount() {
     setOpen(false);
-    await authClient.signOut();
-    await clearActiveAccount();
-    router.replace("/(auth)/sign-in");
+    await startAdditionalAccountSignIn(clearActiveAccount);
   }
 
   async function handleSwitch(accountId: string) {
diff --git a/components/AuthServerPicker.tsx b/components/AuthServerPicker.tsx
index 65acd57..3285aa5 100644
--- a/components/AuthServerPicker.tsx
+++ b/components/AuthServerPicker.tsx
@@ -18,6 +18,8 @@ import {
 
 type AuthServerPickerProps = {
   onReadyChange?: (ready: boolean) => void;
+  /** When true, picker sits inside the auth card with no outer margin. */
+  embedded?: boolean;
 };
 
 function modeSummary(mode: ServerMode, selfHostedUrl: string) {
@@ -26,7 +28,7 @@ function modeSummary(mode: ServerMode, selfHostedUrl: string) {
   return host || "Self-hosted";
 }
 
-export function AuthServerPicker({ onReadyChange }: AuthServerPickerProps) {
+export function AuthServerPicker({ onReadyChange, embedded = false }: AuthServerPickerProps) {
   const { colors } = useAppTheme();
   const { apiUrl, setInstanceUrl } = useAccounts();
   const [expanded, setExpanded] = useState(false);
@@ -93,7 +95,7 @@ export function AuthServerPicker({ onReadyChange }: AuthServerPickerProps) {
   }
 
   return (
-    <View style={styles.wrapper}>
+    <View style={[styles.wrapper, embedded && styles.wrapperEmbedded]}>
       <Pressable
         accessibilityRole="button"
         accessibilityState={{ expanded }}
@@ -182,6 +184,9 @@ const styles = StyleSheet.create({
     gap: spacing.sm,
     marginBottom: spacing.md,
   },
+  wrapperEmbedded: {
+    marginBottom: 0,
+  },
   trigger: {
     flexDirection: "row",
     alignItems: "center",
diff --git a/components/PageHeader.tsx b/components/PageHeader.tsx
index 22959fa..d75960b 100644
--- a/components/PageHeader.tsx
+++ b/components/PageHeader.tsx
@@ -1,22 +1,20 @@
 import { StyleSheet, Text, View } from "react-native";
 
-import { fonts, spacing } from "@/constants/theme";
+import { fonts } from "@/constants/theme";
 import { tabLayout } from "@/lib/tab-layout";
 import { useAppTheme } from "@/contexts/ThemeContext";
-import { useTopChromeHeight } from "@/lib/top-chrome-insets";
 
 type PageHeaderProps = {
   title: string;
   subtitle: string;
 };
 
-/** Title block — transparent, scrolls under TopChromeBar blur. */
+/** Title block — scrolls with tab screen content. */
 export function PageHeader({ title, subtitle }: PageHeaderProps) {
   const { colors } = useAppTheme();
-  const topChromeHeight = useTopChromeHeight();
 
   return (
-    <View style={[tabLayout.pageHeader, { paddingTop: topChromeHeight + spacing.md }]}>
+    <View style={tabLayout.pageHeader}>
       <Text style={[styles.title, { color: colors.foreground }]}>{title}</Text>
       <Text style={[styles.subtitle, { color: colors.mutedForeground }]}>{subtitle}</Text>
     </View>
diff --git a/components/TabPage.tsx b/components/TabPage.tsx
index 156570d..440e5b8 100644
--- a/components/TabPage.tsx
+++ b/components/TabPage.tsx
@@ -1,7 +1,6 @@
 import type { ReactNode } from "react";
 import { StyleSheet, View } from "react-native";
 import { StatusBar } from "expo-status-bar";
-import { useSafeAreaInsets } from "react-native-safe-area-context";
 
 import { TopChromeBar } from "@/components/TopChromeBar";
 import { useAppTheme } from "@/contexts/ThemeContext";
@@ -10,23 +9,15 @@ type TabPageProps = {
   children: ReactNode;
 };
 
-/** Tab root — floating blurred top chrome; children should be a TabScrollView. */
+/** Tab root — pinned top chrome, scrollable body below. */
 export function TabPage({ children }: TabPageProps) {
-  const insets = useSafeAreaInsets();
   const { isDark } = useAppTheme();
 
   return (
     <View style={styles.root}>
       <StatusBar style={isDark ? "light" : "dark"} />
-      <View
-        style={[
-          styles.content,
-          { paddingLeft: insets.left, paddingRight: insets.right },
-        ]}
-      >
-        {children}
-      </View>
       <TopChromeBar />
+      <View style={styles.content}>{children}</View>
     </View>
   );
 }
@@ -38,6 +29,7 @@ const styles = StyleSheet.create({
   },
   content: {
     flex: 1,
+    minHeight: 0,
     backgroundColor: "transparent",
   },
 });
diff --git a/components/TabScrollView.tsx b/components/TabScrollView.tsx
index cca67ac..0e7df29 100644
--- a/components/TabScrollView.tsx
+++ b/components/TabScrollView.tsx
@@ -1,16 +1,20 @@
-import type { ReactNode } from "react";
+import { useScrollToTop } from "expo-router";
+import { useRef, type ReactNode } from "react";
 import { Platform, ScrollView, type ScrollViewProps, StyleSheet, View } from "react-native";
 
 import { tabLayout } from "@/lib/tab-layout";
-import { useTabBarScrollPadding } from "@/lib/tab-bar-insets";
+import { useTabScreenScrollPadding } from "@/lib/tab-bar-insets";
 
 type TabScrollViewProps = ScrollViewProps & {
-  /** Rendered above screen body — scrolls under the blurred top chrome. */
+  /** Rendered at the top of scroll content (scrolls with the page). */
   header?: ReactNode;
   children: ReactNode;
 };
 
-/** Scroll view for native tab screens — content scrolls under the tab bar. */
+/**
+ * Tab screen scroll view. Top chrome (logo / account) is pinned in TabPage;
+ * the page header and body scroll together here.
+ */
 export function TabScrollView({
   header,
   children,
@@ -18,18 +22,22 @@ export function TabScrollView({
   style,
   ...props
 }: TabScrollViewProps) {
-  const scrollPadding = useTabBarScrollPadding();
+  const scrollRef = useRef<ScrollView>(null);
+  const bottomPadding = useTabScreenScrollPadding();
+
+  useScrollToTop(scrollRef);
 
   return (
     <ScrollView
+      ref={scrollRef}
       style={[styles.scroll, style]}
       contentContainerStyle={[
         tabLayout.scrollContent,
-        { paddingBottom: scrollPadding },
+        { paddingBottom: bottomPadding },
         contentContainerStyle,
       ]}
       contentInsetAdjustmentBehavior={Platform.OS === "ios" ? "never" : undefined}
-      scrollIndicatorInsets={{ bottom: scrollPadding }}
+      scrollIndicatorInsets={{ bottom: bottomPadding }}
       {...props}
     >
       {header}
@@ -41,6 +49,7 @@ export function TabScrollView({
 const styles = StyleSheet.create({
   scroll: {
     flex: 1,
+    minHeight: 0,
     backgroundColor: "transparent",
   },
 });
diff --git a/components/TopChromeBar.tsx b/components/TopChromeBar.tsx
index 198b668..eb3b7b9 100644
--- a/components/TopChromeBar.tsx
+++ b/components/TopChromeBar.tsx
@@ -45,11 +45,7 @@ export function TopChromeBar() {
 
 const styles = StyleSheet.create({
   host: {
+    flexShrink: 0,
     overflow: "hidden",
-    position: "absolute",
-    top: 0,
-    left: 0,
-    right: 0,
-    zIndex: 10,
   },
 });
diff --git a/components/time-clock/TimeClockPanel.tsx b/components/time-clock/TimeClockPanel.tsx
index 9a58a50..50e27e1 100644
--- a/components/time-clock/TimeClockPanel.tsx
+++ b/components/time-clock/TimeClockPanel.tsx
@@ -1,9 +1,10 @@
 import { useEffect, useMemo, useState, type ReactNode } from "react";
-import { Alert, Platform, Pressable, RefreshControl, ScrollView, StyleSheet, Text, View } from "react-native";
+import { Alert, Pressable, RefreshControl, StyleSheet, Text, View } from "react-native";
 import { router } from "expo-router";
 
 import { GlassSurface } from "@/components/GlassSurface";
 import { LoadingScreen } from "@/components/LoadingScreen";
+import { TabScrollView } from "@/components/TabScrollView";
 import { Button } from "@/components/ui/Button";
 import { Card } from "@/components/ui/Card";
 import { DateTimeField } from "@/components/ui/DateTimeField";
@@ -11,8 +12,6 @@ import { Input } from "@/components/ui/Input";
 import { SelectField } from "@/components/ui/SelectField";
 import { fonts, spacing } from "@/constants/theme";
 import { useAppTheme } from "@/contexts/ThemeContext";
-import { useTabBarScrollPadding } from "@/lib/tab-bar-insets";
-import { tabLayout } from "@/lib/tab-layout";
 import { formatDateTime } from "@/lib/format";
 import { parseNonNegativeNumber } from "@/lib/form-validation";
 import type { ThemeColors } from "@/lib/theme-palette";
@@ -70,7 +69,6 @@ export function TimeClockPanel({
   }, []);
 
   const todayQuery = api.timeEntries.getAll.useQuery({ from: todayStart });
-  const scrollPadding = useTabBarScrollPadding();
 
   const clockIn = api.timeEntries.clockIn.useMutation({
     onSuccess: async () => {
@@ -252,11 +250,9 @@ export function TimeClockPanel({
     .join(" · ");
 
   return (
-    <ScrollView
+    <TabScrollView
       style={styles.scroll}
-      contentContainerStyle={[tabLayout.scrollContent, { paddingBottom: scrollPadding }]}
-      contentInsetAdjustmentBehavior={Platform.OS === "ios" ? "never" : undefined}
-      scrollIndicatorInsets={{ bottom: scrollPadding }}
+      header={header}
       refreshControl={
         <RefreshControl
           refreshing={runningQuery.isRefetching}
@@ -270,8 +266,6 @@ export function TimeClockPanel({
         />
       }
     >
-      {header}
-      <View style={tabLayout.scrollBody}>
       {running || !compact ? (
         <GlassSurface style={running ? styles.runningCard : undefined}>
           <View style={styles.hero}>
@@ -442,8 +436,7 @@ export function TimeClockPanel({
           })}
         </Card>
       ) : null}
-      </View>
-    </ScrollView>
+    </TabScrollView>
   );
 }
 
diff --git a/contexts/AppLockContext.tsx b/contexts/AppLockContext.tsx
index 716fb62..e0ee414 100644
--- a/contexts/AppLockContext.tsx
+++ b/contexts/AppLockContext.tsx
@@ -50,6 +50,7 @@ export function AppLockProvider({ children }: { children: ReactNode }) {
   const [biometricAvailable, setBiometricAvailable] = useState(false);
   const [biometricLabel, setBiometricLabel] = useState("Biometrics");
   const wasBackgrounded = useRef(false);
+  const biometricUnlockInProgress = useRef(false);
   const hydrated = useRef(false);
 
   useEffect(() => {
@@ -105,11 +106,17 @@ export function AppLockProvider({ children }: { children: ReactNode }) {
     const subscription = AppState.addEventListener("change", (nextState: AppStateStatus) => {
       if (!hydrated.current || !enabled || !activeAccountId) return;
 
-      if (nextState === "background" || nextState === "inactive") {
+      // Only true backgrounding should re-lock — `inactive` fires during Face ID,
+      // Control Center, and other system sheets and must not trigger another lock.
+      if (nextState === "background") {
         wasBackgrounded.current = true;
       }
 
-      if (nextState === "active" && wasBackgrounded.current) {
+      if (
+        nextState === "active" &&
+        wasBackgrounded.current &&
+        !biometricUnlockInProgress.current
+      ) {
         wasBackgrounded.current = false;
         setIsLocked(true);
       }
@@ -125,6 +132,7 @@ export function AppLockProvider({ children }: { children: ReactNode }) {
       if (!stored || stored !== pin) {
         return false;
       }
+      wasBackgrounded.current = false;
       setIsLocked(false);
       return true;
     },
@@ -136,24 +144,30 @@ export function AppLockProvider({ children }: { children: ReactNode }) {
       return false;
     }
 
-    const result = await LocalAuthentication.authenticateAsync({
-      promptMessage: "Unlock beenvoice",
-      cancelLabel: "Use PIN",
-      disableDeviceFallback: false,
-      biometricsSecurityLevel: "weak",
-    });
+    biometricUnlockInProgress.current = true;
+    try {
+      const result = await LocalAuthentication.authenticateAsync({
+        promptMessage: "Unlock beenvoice",
+        cancelLabel: "Use PIN",
+        disableDeviceFallback: false,
+        biometricsSecurityLevel: "weak",
+      });
 
-    if (!result.success) {
-      return false;
+      if (!result.success) {
+        return false;
+      }
+
+      if (!biometricEnabled) {
+        await setBiometricEnabled(activeAccountId, true);
+        setBiometricEnabledState(true);
+      }
+
+      wasBackgrounded.current = false;
+      setIsLocked(false);
+      return true;
+    } finally {
+      biometricUnlockInProgress.current = false;
     }
-
-    if (!biometricEnabled) {
-      await setBiometricEnabled(activeAccountId, true);
-      setBiometricEnabledState(true);
-    }
-
-    setIsLocked(false);
-    return true;
   }, [biometricAvailable, biometricEnabled, activeAccountId]);
 
   const enableLock = useCallback(
diff --git a/contexts/AuthContext.tsx b/contexts/AuthContext.tsx
index 6d7303d..a455075 100644
--- a/contexts/AuthContext.tsx
+++ b/contexts/AuthContext.tsx
@@ -1,5 +1,6 @@
 import { expoClient } from "@better-auth/expo/client";
 import { createAuthClient } from "better-auth/react";
+import { genericOAuthClient } from "better-auth/client/plugins";
 import * as SecureStore from "expo-secure-store";
 import {
   createContext,
@@ -10,6 +11,20 @@ import {
 
 type AuthClient = ReturnType<typeof createAuthClient>;
 
+function createAppAuthClient(apiUrl: string, storagePrefix: string): AuthClient {
+  return createAuthClient({
+    baseURL: apiUrl,
+    plugins: [
+      expoClient({
+        scheme: "beenvoice",
+        storagePrefix,
+        storage: SecureStore,
+      }),
+      genericOAuthClient(),
+    ],
+  });
+}
+
 const AuthContext = createContext<AuthClient | null>(null);
 
 export function AuthProvider({
@@ -22,17 +37,7 @@ export function AuthProvider({
   children: ReactNode;
 }) {
   const client = useMemo(
-    () =>
-      createAuthClient({
-        baseURL: apiUrl,
-        plugins: [
-          expoClient({
-            scheme: "beenvoice",
-            storagePrefix,
-            storage: SecureStore,
-          }),
-        ],
-      }),
+    () => createAppAuthClient(apiUrl, storagePrefix),
     [apiUrl, storagePrefix],
   );
 
diff --git a/lib/add-account.ts b/lib/add-account.ts
new file mode 100644
index 0000000..dc8c4c5
--- /dev/null
+++ b/lib/add-account.ts
@@ -0,0 +1,12 @@
+import { router } from "expo-router";
+
+import { prepareForAdditionalSignIn } from "@/lib/auth-storage";
+
+/** Switch to guest mode and open sign-in without wiping other saved accounts. */
+export async function startAdditionalAccountSignIn(
+  clearActiveAccount: () => Promise<void>,
+) {
+  await clearActiveAccount();
+  await prepareForAdditionalSignIn();
+  router.replace("/(auth)/sign-in");
+}
diff --git a/lib/auth-capabilities.ts b/lib/auth-capabilities.ts
new file mode 100644
index 0000000..cb26d55
--- /dev/null
+++ b/lib/auth-capabilities.ts
@@ -0,0 +1,21 @@
+export type AuthCapabilities = {
+  authentik: boolean;
+  signupsDisabled: boolean;
+};
+
+const DEFAULT_CAPABILITIES: AuthCapabilities = {
+  authentik: false,
+  signupsDisabled: false,
+};
+
+export async function fetchAuthCapabilities(apiUrl: string): Promise<AuthCapabilities> {
+  const base = apiUrl.replace(/\/$/, "");
+
+  try {
+    const response = await fetch(`${base}/api/auth/capabilities`);
+    if (!response.ok) return DEFAULT_CAPABILITIES;
+    return (await response.json()) as AuthCapabilities;
+  } catch {
+    return DEFAULT_CAPABILITIES;
+  }
+}
diff --git a/lib/auth-oauth.ts b/lib/auth-oauth.ts
new file mode 100644
index 0000000..c86c89e
--- /dev/null
+++ b/lib/auth-oauth.ts
@@ -0,0 +1,15 @@
+import type { createAuthClient } from "better-auth/react";
+
+type AuthClient = ReturnType<typeof createAuthClient>;
+
+type OAuth2SignIn = (input: {
+  providerId: string;
+  callbackURL: string;
+}) => Promise<{ error?: { message?: string } | null }>;
+
+export async function signInWithAuthentik(authClient: AuthClient, callbackURL: string) {
+  return (authClient.signIn as unknown as { oauth2: OAuth2SignIn }).oauth2({
+    providerId: "authentik",
+    callbackURL,
+  });
+}
diff --git a/lib/auth-storage.ts b/lib/auth-storage.ts
index cd0b2ed..bd4b3f2 100644
--- a/lib/auth-storage.ts
+++ b/lib/auth-storage.ts
@@ -41,6 +41,33 @@ export async function migrateAuthStorage(fromPrefix: string, toPrefix: string):
   );
 }
 
+export async function clearAuthStorage(prefix: string): Promise<void> {
+  await Promise.all(
+    AUTH_STORAGE_SUFFIXES.map(async (suffix) => {
+      const key = storageKeyForPrefix(prefix, suffix);
+      const value = await SecureStore.getItemAsync(key);
+
+      if (value?.startsWith(CHUNK_MARKER)) {
+        const count = Number(value.slice(CHUNK_MARKER.length));
+        if (Number.isInteger(count) && count > 0) {
+          await Promise.all(
+            Array.from({ length: count }, (_, index) =>
+              SecureStore.deleteItemAsync(`${key}.${index}`),
+            ),
+          );
+        }
+      }
+
+      await SecureStore.deleteItemAsync(key);
+    }),
+  );
+}
+
+/** Clears guest auth storage before signing into an additional account. */
+export async function prepareForAdditionalSignIn(): Promise<void> {
+  await clearAuthStorage(GUEST_AUTH_STORAGE_PREFIX);
+}
+
 export async function finalizeAuthenticatedAccount(input: {
   apiUrl: string;
   userId: string;
diff --git a/lib/complete-sign-in.ts b/lib/complete-sign-in.ts
new file mode 100644
index 0000000..b55f923
--- /dev/null
+++ b/lib/complete-sign-in.ts
@@ -0,0 +1,34 @@
+import type { createAuthClient } from "better-auth/react";
+
+import { finalizeAuthenticatedAccount } from "@/lib/auth-storage";
+
+type AuthClient = ReturnType<typeof createAuthClient>;
+
+export async function completeSignInAfterAuth(
+  authClient: AuthClient,
+  input: {
+    apiUrl: string;
+    activeAccountId: string | null;
+    registerAccount: (account: {
+      instanceUrl: string;
+      userId: string;
+      email: string;
+      name: string;
+    }) => Promise<unknown>;
+  },
+): Promise<boolean> {
+  const session = await authClient.getSession();
+  const user = session.data?.user;
+  if (!user) return false;
+
+  await finalizeAuthenticatedAccount({
+    apiUrl: input.apiUrl,
+    userId: user.id,
+    email: user.email,
+    name: user.name,
+    activeAccountId: input.activeAccountId,
+    registerAccount: input.registerAccount,
+  });
+
+  return true;
+}
diff --git a/lib/tab-bar-insets.ts b/lib/tab-bar-insets.ts
index fdba4c9..7e2305e 100644
--- a/lib/tab-bar-insets.ts
+++ b/lib/tab-bar-insets.ts
@@ -50,6 +50,17 @@ export function useFloatingActionBottom(): number {
   return tabBar + homeIndicator + spacing.xs;
 }
 
+/**
+ * Bottom padding for tab-root ScrollViews (Dashboard, Invoices, etc.).
+ * Uses full tab-bar clearance — do not trim; undershooting hides content under the bar.
+ */
+export function useTabScreenScrollPadding(): number {
+  const { bottom: homeIndicator } = useSafeAreaInsets();
+  const tabBar = useNativeTabBarHeight();
+
+  return tabBar + homeIndicator + spacing.sm;
+}
+
 /** @deprecated Use useTabBarScrollPadding */
 export function useTabBarInset() {
   return useTabBarScrollPadding();
diff --git a/lib/tab-layout.ts b/lib/tab-layout.ts
index a17d24c..cf2bb67 100644
--- a/lib/tab-layout.ts
+++ b/lib/tab-layout.ts
@@ -6,12 +6,13 @@ import { spacing } from "@/constants/theme";
 export const tabLayout = StyleSheet.create({
   pageHeader: {
     gap: 4,
+    paddingTop: spacing.md,
+    paddingBottom: spacing.md,
   },
   scrollContent: {
     paddingHorizontal: spacing.md,
   },
   scrollBody: {
     gap: spacing.md,
-    marginTop: spacing.sm,
   },
 });
diff --git a/widgets/TimeClockActivity.tsx b/widgets/TimeClockActivity.tsx
index 94e91bf..e293085 100644
--- a/widgets/TimeClockActivity.tsx
+++ b/widgets/TimeClockActivity.tsx
@@ -1,4 +1,4 @@
-import { HStack, Image, Text } from "@expo/ui/swift-ui";
+import { HStack, Image, Spacer, Text } from "@expo/ui/swift-ui";
 import {
   font,
   foregroundStyle,
@@ -17,8 +17,8 @@ function TimeClockActivity(props: TimeClockActivityProps, _environment: LiveActi
 
   const green = "green";
   const title = props.description.trim() || "Clock In";
-  const subtitle = [props.clientName, props.invoiceLabel].filter(Boolean).join(" · ");
-  const detailLine = subtitle ? `${title}\n${subtitle}` : title;
+  const clientLabel = props.clientName.trim() || title;
+  const subtitle = props.invoiceLabel.trim();
 
   const timerMods = [
     font({ design: "monospaced", weight: "bold", size: 20 }),
@@ -34,41 +34,43 @@ function TimeClockActivity(props: TimeClockActivityProps, _environment: LiveActi
     lineLimit(1),
     minimumScaleFactor(0.8),
   ];
-  const brandMods = [
+  const clientMods = [
     font({ weight: "semibold", size: 13 }),
-    foregroundStyle(green),
+    foregroundStyle({ type: "hierarchical", style: "primary" }),
     lineLimit(1),
     minimumScaleFactor(0.85),
   ];
-  const detailMods = [
-    font({ weight: "medium", size: 12 }),
+  const subtitleMods = [
+    font({ size: 11 }),
     foregroundStyle({ type: "hierarchical", style: "secondary" }),
-    lineLimit(2),
+    lineLimit(1),
     minimumScaleFactor(0.85),
   ];
 
   return {
     banner: (
-      <HStack alignment="center" spacing={10} modifiers={[padding({ all: 12 })]}>
+      <HStack alignment="center" spacing={8} modifiers={[padding({ horizontal: 14, vertical: 12 })]}>
         <Image
           systemName="dollarsign.circle.fill"
           color={green}
           size={22}
           modifiers={[widgetAccentedRenderingMode("fullColor")]}
         />
-        <Text modifiers={brandMods}>beenvoice</Text>
+        <Text modifiers={clientMods}>{clientLabel}</Text>
+        <Spacer minLength={12} />
         <Text modifiers={timerMods}>{props.elapsedShort}</Text>
       </HStack>
     ),
     bannerSmall: (
-      <HStack alignment="center" spacing={8} modifiers={[padding({ all: 10 })]}>
+      <HStack alignment="center" spacing={8} modifiers={[padding({ horizontal: 12, vertical: 10 })]}>
         <Image
           systemName="dollarsign.circle.fill"
           color={green}
           size={18}
           modifiers={[widgetAccentedRenderingMode("fullColor")]}
         />
-        <Text modifiers={brandMods}>beenvoice</Text>
+        <Text modifiers={clientMods}>{clientLabel}</Text>
+        <Spacer minLength={8} />
         <Text modifiers={compactTimerMods}>{props.elapsedShort}</Text>
       </HStack>
     ),
@@ -97,8 +99,11 @@ function TimeClockActivity(props: TimeClockActivityProps, _environment: LiveActi
         modifiers={[widgetAccentedRenderingMode("fullColor")]}
       />
     ),
+    expandedCenter: <Text modifiers={clientMods}>{clientLabel}</Text>,
     expandedTrailing: <Text modifiers={timerMods}>{props.elapsedShort}</Text>,
-    expandedBottom: <Text modifiers={detailMods}>{detailLine}</Text>,
+    expandedBottom: (
+      <Text modifiers={subtitleMods}>{subtitle || "beenvoice"}</Text>
+    ),
   };
 }