feat(learn,app): explanations wait behind a question mark beside their title

What explains a setting or a section, rather than what is the person's
own, moves behind halkyon_ui's HelpButton, beside its title through the
new ExplainedTitle (the developer's review of 3 Nov 2026): in Learn's
settings (citations, the Pomodoro timer, grammar, the web search,
Jellyfin, the device's dictionaries, counting one's learning), the study
settings, export's progress, the Jellyfin tags and the study button's
back first; in halkyon_app, setting up a password, adding SimpleLogin,
own keys not allowed, the profile page's link back and the operator's
grant sheet.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

packages/halkyon_app/lib/src/assistant/widget/assistant_grants_screen.dart

@@ -455,7 +455,11 @@ class _GrantSheetState() extends State<_GrantSheet> {
         crossAxisAlignment: CrossAxisAlignment.stretch,
         children: [
           if (grantee == null) ...[
-            Text(l10n.assistantPeopleTitle, style: heading),
+            ExplainedTitle(
+              l10n.assistantPeopleTitle,
+              help: l10n.assistantGrantNote,
+              style: heading,
+            ),
             const SizedBox(height: 8),
             if (state.accounts.isNotEmpty) ...[
               Wrap(
@@ -505,7 +509,14 @@ class _GrantSheetState() extends State<_GrantSheet> {
             ),
           ],
           const SizedBox(height: 16),
-          Text(l10n.assistantGrantBudget, style: heading),
+          ExplainedTitle(
+            l10n.assistantGrantBudget,
+            help: [
+              l10n.assistantGrantLimitHelper,
+              if (priced) l10n.assistantGrantMoneyNote,
+            ].join(' '),
+            style: heading,
+          ),
           const SizedBox(height: 8),
           if (priced)
             _LimitRow(
@@ -520,13 +531,6 @@ class _GrantSheetState() extends State<_GrantSheet> {
             suffix: null,
             enabled: !state.busy,
           ),
-          Text(
-            [
-              l10n.assistantGrantLimitHelper,
-              if (priced) l10n.assistantGrantMoneyNote,
-            ].join(' '),
-            style: muted,
-          ),
           if (grantee == null && state.replaced.isNotEmpty) ...[
             const SizedBox(height: 16),
             _Replaced(state.replaced, currency: setUp.currency),
@@ -538,10 +542,6 @@ class _GrantSheetState() extends State<_GrantSheet> {
               style: TextStyle(color: theme.colorScheme.error),
             ),
           ],
-          if (grantee == null) ...[
-            const SizedBox(height: 16),
-            Text(l10n.assistantGrantNote, style: muted),
-          ],
         ],
       ),
       footer: FilledButton(

packages/halkyon_app/lib/src/assistant/widget/assistants_card.dart

@@ -72,7 +72,7 @@ class const _AssistantsView({
           return const SizedBox.shrink();
         }
         final offer = state.offer;
-        final muted = theme.textTheme.bodyMedium?.copyWith(
+        final subtitle = theme.textTheme.titleSmall?.copyWith(
           color: theme.colorScheme.onSurfaceVariant,
         );
         return Padding(
@@ -141,21 +141,16 @@ class const _AssistantsView({
                 if (ownKept && (offer.ownKeys || state.own.isNotEmpty)) ...[
                   Padding(
                     padding: const EdgeInsets.only(top: 8),
-                    child: Text(
-                      l10n.assistantOwnTitle,
-                      style: theme.textTheme.titleSmall?.copyWith(
-                        color: theme.colorScheme.onSurfaceVariant,
-                      ),
-                    ),
+                    // Why own keys go unasked, where they are not allowed,
+                    // behind its question mark (decided 3 Nov 2026).
+                    child: offer.ownKeys
+                        ? Text(l10n.assistantOwnTitle, style: subtitle)
+                        : ExplainedTitle(
+                            l10n.assistantOwnTitle,
+                            help: l10n.assistantOwnNotAllowed(instance),
+                            style: subtitle,
+                          ),
                   ),
-                  if (!offer.ownKeys)
-                    Padding(
-                      padding: const EdgeInsets.symmetric(vertical: 8),
-                      child: Text(
-                        l10n.assistantOwnNotAllowed(instance),
-                        style: muted,
-                      ),
-                    ),
                   for (final own in state.own)
                     ListTile(
                       contentPadding: EdgeInsets.zero,

packages/halkyon_app/lib/src/password/widget/account_security_section.dart

@@ -79,8 +79,10 @@ class const _AccountSecurity() extends StatelessWidget {
             ListTile(
               contentPadding: EdgeInsets.zero,
               leading: const Icon(LucideIcons.keyRound),
-              title: Text(l10n.passwordSectionSetUp),
-              subtitle: Text(l10n.passwordSectionSetUpHint),
+              title: ExplainedTitle(
+                l10n.passwordSectionSetUp,
+                help: l10n.passwordSectionSetUpHint,
+              ),
               onTap: () => _setUp(context, security),
             ),
         ] else if (!security.finished)

packages/halkyon_app/lib/src/profile/widget/public_profile_section.dart

@@ -731,9 +731,6 @@ class const _ProfilePage({required final String url}) extends StatelessWidget {
   Widget build(BuildContext context) {
     final l10n = HalkyonAppLocalizations.of(context);
     final theme = Theme.of(context);
-    final muted = theme.textTheme.bodySmall?.copyWith(
-      color: theme.colorScheme.onSurfaceVariant,
-    );
     return Padding(
       padding: const EdgeInsets.only(top: 8),
       child: Column(
@@ -751,6 +748,9 @@ class const _ProfilePage({required final String url}) extends StatelessWidget {
                   overflow: TextOverflow.ellipsis,
                 ),
               ),
+              // What linking back does, behind its question mark (decided
+              // 3 Nov 2026).
+              HelpButton(l10n.publicProfileVerifyHint),
               IconButton(
                 tooltip: l10n.publicProfilePageCopy,
                 icon: const Icon(LucideIcons.copy, size: 18),
@@ -766,7 +766,6 @@ class const _ProfilePage({required final String url}) extends StatelessWidget {
               ),
             ],
           ),
-          Text(l10n.publicProfileVerifyHint, style: muted),
         ],
       ),
     );

packages/halkyon_app/lib/src/simplelogin/widget/simplelogin_section.dart

@@ -7,6 +7,7 @@ import 'package:halkyon_app/src/simplelogin/model/simplelogin_standing.dart';
 import 'package:halkyon_app/src/simplelogin/widget/keys_reset.dart';
 import 'package:halkyon_app/src/simplelogin/widget/simplelogin_sheet.dart';
 import 'package:halkyon_app/src/simplelogin/widget/simplelogin_standing_scope.dart';
+import 'package:halkyon_ui/halkyon_ui.dart';
 import 'package:lucide_icons_flutter/lucide_icons.dart';
 import 'package:material_ui/material_ui.dart';
 
@@ -64,8 +65,10 @@ class const _SimpleLoginSection({required final double gapAbove})
             ListTile(
               contentPadding: EdgeInsets.zero,
               leading: const Icon(LucideIcons.link),
-              title: Text(l10n.simpleLoginAddTitle),
-              subtitle: Text(l10n.simpleLoginAddHint),
+              title: ExplainedTitle(
+                l10n.simpleLoginAddTitle,
+                help: l10n.simpleLoginAddHint,
+              ),
               onTap: () => addSimpleLogin(context),
             ),
           ],