Security locks work independently; other-account avatars flush right in the avatar menu

Login lock, lock account switching and lock hidden files no longer depend on
each other: passGate prompts on its own flag, the two sub-locks can be set
with login lock off, and disabling login lock leaves them alone. Turning any
lock on or off asks for device auth (on also checks the device can). The iOS
Share Extension's unlock rules follow. The avatar dropdown's additional
accounts lose the 44px spacer so their avatars sit at the right edge.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

lib/widgets/avatar_menu.dart

@@ -332,7 +332,6 @@ class _OtherAccountRow extends StatelessWidget {
             ),
             const SizedBox(width: 12),
             NooAvatar(initials: accountInitial(name), current: false, size: 40),
-            const SizedBox(width: 44),
           ],
         ),
       ),

lib/widgets/settings/settings_security.dart

@@ -26,26 +26,28 @@ String biometricLabel(TargetPlatform platform) {
   }
 }
 
-/// Settings section 3: login lock, which gates opening the app, switching
-/// accounts, and revealing hidden files behind the device's own PIN/
+/// Settings section 3: three independent locks - opening the app, switching
+/// accounts, and revealing hidden files - each behind the device's own PIN/
 /// biometric credential (see `AppLockService` - this app never stores or
-/// handles a PIN itself).
+/// handles a PIN itself). Turning one on or off asks for that credential, and
+/// none of them requires or implies another.
 class SettingsSecuritySection extends StatelessWidget {
   const SettingsSecuritySection({super.key});
 
-  Future<void> _handleLoginLockChanged(
-    BuildContext context,
-    SessionController session,
-    bool value,
-  ) async {
-    final success = value ? await session.setupLoginLock() : await session.disableLoginLock();
+  Future<void> _handleLockChanged(
+    BuildContext context, {
+    required Future<bool> Function() change,
+    required bool turningOn,
+    required String name,
+  }) async {
+    final success = await change();
     if (!success && context.mounted) {
       ScaffoldMessenger.of(context).showSnackBar(
         SnackBar(
           content: Text(
-            value
-                ? "Could not set up login lock - make sure this device has a PIN, pattern, password, or biometric configured"
-                : 'Could not turn off login lock',
+            turningOn
+                ? "Could not turn on $name - make sure this device has a PIN, pattern, password, or biometric configured"
+                : 'Could not turn off $name',
           ),
           behavior: SnackBarBehavior.floating,
         ),
@@ -64,10 +66,17 @@ class SettingsSecuritySection extends StatelessWidget {
         NooSettingsRow(
           icon: LucideIcons.lock,
           label: Text(biometricLabel(platform)),
-          subtitle: const Text("Require this device's PIN or biometric to open Noo"),
+          subtitle: const Text(
+            "Require this device's PIN or biometric to open Noo",
+          ),
           trailing: NooToggle(
             checked: session.loginLockEnabled,
-            onChanged: (value) => _handleLoginLockChanged(context, session, value),
+            onChanged: (value) => _handleLockChanged(
+              context,
+              change: value ? session.setupLoginLock : session.disableLoginLock,
+              turningOn: value,
+              name: 'login lock',
+            ),
           ),
         ),
         NooSettingsRow(
@@ -76,7 +85,12 @@ class SettingsSecuritySection extends StatelessWidget {
           subtitle: const Text('Unlock to switch between saved accounts'),
           trailing: NooToggle(
             checked: session.lockAccountSwitching,
-            onChanged: session.loginLockEnabled ? session.setLockAccountSwitching : null,
+            onChanged: (value) => _handleLockChanged(
+              context,
+              change: () => session.setLockAccountSwitching(value),
+              turningOn: value,
+              name: 'account switching lock',
+            ),
           ),
         ),
         NooSettingsRow(
@@ -85,7 +99,12 @@ class SettingsSecuritySection extends StatelessWidget {
           subtitle: const Text('Unlock to reveal hidden files and folders'),
           trailing: NooToggle(
             checked: session.lockHiddenFiles,
-            onChanged: session.loginLockEnabled ? session.setLockHiddenFiles : null,
+            onChanged: (value) => _handleLockChanged(
+              context,
+              change: () => session.setLockHiddenFiles(value),
+              turningOn: value,
+              name: 'hidden files lock',
+            ),
           ),
         ),
       ],