feat(studio): optional pinned-key field in the store-add form

The module-store manager's 'Add a store' form gains an optional PEM
public-key field; when set it pins that publisher key to the store
(per-store signing trust). Localized DE/EN.

Signed-off-by: flemming-it <stefan.a.flemming@googlemail.com>

lib/data/hub.dart

@@ -220,8 +220,14 @@ class HubService {
     required String name,
     required String url,
     String bearerEnv = '',
+    String pinnedPubkeyPem = '',
   }) =>
-      _client.addStore(name: name, url: url, bearerEnv: bearerEnv);
+      _client.addStore(
+        name: name,
+        url: url,
+        bearerEnv: bearerEnv,
+        pinnedPubkeyPem: pinnedPubkeyPem,
+      );
 
   /// Drop a configured store by name (the bundled seed cannot be removed).
   Future<RemoveStoreResponse> removeStore(String name) =>

lib/l10n/app_de.arb

@@ -332,6 +332,8 @@
   "storesManagerRemoveFailed": "Store konnte nicht entfernt werden",
   "storesManagerSuggested": "Vorgeschlagene Stores",
   "storesManagerAddShort": "Hinzufügen",
+  "storesManagerPinnedKeyLabel": "Angepinnter Public-Key — PEM (optional)",
+  "storesManagerPinnedKeyHint": "Signierte Module dieses Stores werden gegen diesen Key geprüft statt gegen den eingebauten Vendor-Key. Füge einen PEM-Public-Key ein.",
   "storesManagerNotAvailable": "Noch nicht verfügbar",
   "storesManagerNotAvailableHint": "Der Anbieter hat diesen Store-Index noch nicht veröffentlicht. Sobald er das tut, ist er installierbar.",
   "storesSuggestedReclaimDesc": "Recl∆Im — Module für Rechts- und Pflichten-Reform-Mapping",

lib/l10n/app_en.arb

@@ -345,6 +345,8 @@
   "storesManagerRemoveFailed": "Could not remove store",
   "storesManagerSuggested": "Suggested stores",
   "storesManagerAddShort": "Add",
+  "storesManagerPinnedKeyLabel": "Pinned public key — PEM (optional)",
+  "storesManagerPinnedKeyHint": "Signed modules from this store verify against this key instead of the built-in vendor key. Paste a PEM public key.",
   "storesManagerNotAvailable": "Not available yet",
   "storesManagerNotAvailableHint": "The provider hasn't published this store index yet. It will become installable once they do.",
   "storesSuggestedReclaimDesc": "Recl∆Im — modules for law & duty reform-mapping",

lib/l10n/app_localizations.dart

@@ -1514,6 +1514,18 @@ abstract class AppLocalizations {
   /// **'Add'**
   String get storesManagerAddShort;
 
+  /// No description provided for @storesManagerPinnedKeyLabel.
+  ///
+  /// In en, this message translates to:
+  /// **'Pinned public key — PEM (optional)'**
+  String get storesManagerPinnedKeyLabel;
+
+  /// No description provided for @storesManagerPinnedKeyHint.
+  ///
+  /// In en, this message translates to:
+  /// **'Signed modules from this store verify against this key instead of the built-in vendor key. Paste a PEM public key.'**
+  String get storesManagerPinnedKeyHint;
+
   /// No description provided for @storesManagerNotAvailable.
   ///
   /// In en, this message translates to:

lib/l10n/app_localizations_de.dart

@@ -815,6 +815,14 @@ class AppLocalizationsDe extends AppLocalizations {
   @override
   String get storesManagerAddShort => 'Hinzufügen';
 
+  @override
+  String get storesManagerPinnedKeyLabel =>
+      'Angepinnter Public-Key — PEM (optional)';
+
+  @override
+  String get storesManagerPinnedKeyHint =>
+      'Signierte Module dieses Stores werden gegen diesen Key geprüft statt gegen den eingebauten Vendor-Key. Füge einen PEM-Public-Key ein.';
+
   @override
   String get storesManagerNotAvailable => 'Noch nicht verfügbar';
 

lib/l10n/app_localizations_en.dart

@@ -833,6 +833,14 @@ class AppLocalizationsEn extends AppLocalizations {
   @override
   String get storesManagerAddShort => 'Add';
 
+  @override
+  String get storesManagerPinnedKeyLabel =>
+      'Pinned public key — PEM (optional)';
+
+  @override
+  String get storesManagerPinnedKeyHint =>
+      'Signed modules from this store verify against this key instead of the built-in vendor key. Paste a PEM public key.';
+
   @override
   String get storesManagerNotAvailable => 'Not available yet';
 

lib/widgets/chain_stores_dialog.dart

@@ -12,6 +12,7 @@ import 'package:flutter/material.dart';
 import '../data/error_presentation.dart';
 import '../data/hub.dart';
 import '../l10n/app_localizations.dart';
+import '../theme/theme.dart';
 import '../theme/tokens.dart';
 
 class ChainStoresDialog extends StatefulWidget {
@@ -30,6 +31,7 @@ class _ChainStoresDialogState extends State<ChainStoresDialog> {
   late Future<List<StoreSource>> _future;
   final _name = TextEditingController();
   final _url = TextEditingController();
+  final _pubkey = TextEditingController();
   bool _busy = false;
 
   /// Reachability of each suggested store's index URL. `null` while the
@@ -81,24 +83,31 @@ class _ChainStoresDialogState extends State<ChainStoresDialog> {
   void dispose() {
     _name.dispose();
     _url.dispose();
+    _pubkey.dispose();
     super.dispose();
   }
 
-  Future<void> _add() =>
-      _addStore(_name.text.trim(), _url.text.trim(), fromFields: true);
+  Future<void> _add() => _addStore(
+        _name.text.trim(),
+        _url.text.trim(),
+        pinnedPubkeyPem: _pubkey.text.trim(),
+        fromFields: true,
+      );
 
   /// Shared add path — used by both the manual name/URL form and the
   /// one-click suggested-store buttons.
   Future<void> _addStore(String name, String url,
-      {bool fromFields = false}) async {
+      {String pinnedPubkeyPem = '', bool fromFields = false}) async {
     if (name.isEmpty || url.isEmpty) return;
     setState(() => _busy = true);
     try {
-      final r = await HubService.instance.addStore(name: name, url: url);
+      final r = await HubService.instance
+          .addStore(name: name, url: url, pinnedPubkeyPem: pinnedPubkeyPem);
       if (!mounted) return;
       if (fromFields) {
         _name.clear();
         _url.clear();
+        _pubkey.clear();
       }
       ScaffoldMessenger.of(context)
           .showSnackBar(SnackBar(content: Text(r.message)));
@@ -248,6 +257,22 @@ class _ChainStoresDialogState extends State<ChainStoresDialog> {
                 ),
               ],
             ),
+            const SizedBox(height: ChainSpace.sm),
+            // Optional per-store pinned publisher key (PEM). When set,
+            // signed modules from this store verify against this key
+            // instead of the built-in vendor anchor.
+            TextField(
+              controller: _pubkey,
+              minLines: 1,
+              maxLines: 4,
+              style: ChainTheme.mono(size: 11),
+              decoration: InputDecoration(
+                labelText: l.storesManagerPinnedKeyLabel,
+                helperText: l.storesManagerPinnedKeyHint,
+                helperMaxLines: 3,
+                isDense: true,
+              ),
+            ),
           ],
         ),
       ),