feat: adopt smolmail protocol 1.1, adaptive nav shell, and server mail retention

lib/presentation/widgets/message/message_list.dart

@@ -5,21 +5,23 @@ import "package:smol_mail/data/providers/providers.dart";
 import "package:smol_mail/presentation/widgets/message/message_tile.dart";
 
 class MessageList extends ConsumerWidget {
+  final String folder;
   final Future<void> Function() onRefresh;
 
   const MessageList({
     super.key,
+    required this.folder,
     required this.onRefresh,
   });
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final messages = ref.watch(messagesProvider);
+    final messages = ref.watch(messagesForFolderProvider(folder));
 
     return RefreshIndicator(
       onRefresh: onRefresh,
       child: ListView.builder(
-        itemBuilder: (ctx, i) => MessageTile(record: messages[i]),
+        itemBuilder: (ctx, i) => MessageTile(folder: folder, record: messages[i]),
         itemCount: messages.length,
       ),
     );

lib/presentation/widgets/message/message_tile.dart

@@ -11,13 +11,13 @@ import "package:smol_mail/smol/proto.dart";
 import "package:smol_mail/smol/store.dart";
 
 class MessageTile extends ConsumerWidget {
+  final String folder;
   final MailRecord record;
 
-  const MessageTile({super.key, required this.record});
+  const MessageTile({super.key, required this.folder, required this.record});
 
   @override
   Widget build(BuildContext context, WidgetRef ref) {
-    final folder = ref.watch(folderProvider);
     final store = ref.watch(storeProvider);
     final opened = ref.read(clientProvider).describe(record);
     final appColors = Theme.of(context).extension<AppColors>()!;
@@ -31,7 +31,7 @@ class MessageTile extends ConsumerWidget {
     } else {
       who = "?";
     }
-    final unread = folder == "inbox" && !store.isRead(record.id);
+    final unread = folder != "sent" && !store.isRead(record.id);
     final errorText = opened.error != null ? "<unreadable>" : null;
     final subject =
         errorText ?? (opened.subject.isEmpty ? "(no subject)" : opened.subject);
@@ -44,7 +44,7 @@ class MessageTile extends ConsumerWidget {
       splashColor: appColors.highlight,
       focusColor: appColors.cardFill,
       onTap: () {
-        if (folder == "inbox") {
+        if (folder != "sent") {
           store.markRead(record.id);
           ref.read(revisionProvider.notifier).bump();
         }

lib/presentation/widgets/message/message_view.dart

@@ -15,12 +15,14 @@ import "package:smol_mail/smol/store.dart";
 /// The opened message: trust row (fingerprint and how the sender's key is
 /// known), frontmatter fields, and the plain body — smol mail has no HTML.
 class MessageView extends ConsumerWidget {
+  final String folder;
   final MailRecord record;
   final OpenedRecord opened;
   final void Function(Uint8List senderKey)? onNameSender;
 
   const MessageView({
     super.key,
+    required this.folder,
     required this.record,
     required this.opened,
     this.onNameSender,
@@ -38,18 +40,19 @@ class MessageView extends ConsumerWidget {
       );
     }
 
-    final folder = ref.watch(folderProvider);
     final store = ref.watch(storeProvider);
     final client = ref.read(clientProvider);
 
     // Sent copies carry no signature from a third party; the trust row then
     // just says what they are.
     final isSent = folder == "sent";
+    final isRequest = folder == "requests";
     final senderKey = opened.sender;
     final known = senderKey == null ? null : store.addressForKey(senderKey);
     final contact = known == null ? null : store.contact(known);
     final verifiedSender = contact?.verified ?? false;
     final replyTo = isSent ? null : client.replyAddress(opened);
+    final accepted = known == null ? null : store.accepted(known);
 
     final subject =
         opened.subject.isEmpty ? "(no subject)" : opened.subject;
@@ -69,6 +72,10 @@ class MessageView extends ConsumerWidget {
                     : "key bound to no address",
             alert: known == null,
           ),
+        if (isRequest) ...[
+          const SizedBox(height: 10),
+          _badge(context, "arrived without an accept token (SPEC.md §5.8)", alert: true),
+        ],
         if (!isSent && senderKey != null) ...[
           const SizedBox(height: 10),
           _keyBlock(context, "${fingerprint(senderKey)}\n${b32encode(senderKey)}"),
@@ -78,7 +85,7 @@ class MessageView extends ConsumerWidget {
             isSent ? (record.recipient ?? "") : (known ?? "unknown sender")),
         _field(context, "Date", formatTime(opened.time)),
         for (final entry in opened.fields.entries)
-          if (entry.key != "Subject" && entry.key != "Reply-To")
+          if (entry.key != "subject" && entry.key != "reply-to" && entry.key != "accept")
             _field(context, entry.key, entry.value),
         if (!isSent && replyTo != null)
           Row(
@@ -114,6 +121,27 @@ class MessageView extends ConsumerWidget {
               child: const Text("Name this sender"),
             ),
           ),
+        if (isRequest && known != null && !(accepted?.active ?? false))
+          Align(
+            alignment: Alignment.centerLeft,
+            child: TextButton.icon(
+              icon: const Icon(Icons.check_circle_outline, size: 18),
+              label: const Text("Accept sender"),
+              onPressed: () async {
+                try {
+                  await client.acceptContact(known);
+                  ref.read(revisionProvider.notifier).bump();
+                  if (context.mounted) {
+                    ScaffoldMessenger.of(context).showSnackBar(
+                      SnackBar(content: Text("$known accepted")),
+                    );
+                  }
+                } catch (err) {
+                  if (context.mounted) showErrorSnackBar(context, err.toString());
+                }
+              },
+            ),
+          ),
         const SizedBox(height: 10),
         const Divider(height: 1),
         const SizedBox(height: 20),