feat(block2): messages inbox + drawer 'Chat' link (was unreachable)

Chat was only reachable via an offer's 'Message' button, and the drawer 'Chat'
sat on 'coming soon' — so messaging/trust were effectively hidden.
- MessageStore keeps a conversation index (the keystore has no key enumeration)
  and exposes conversations() — peers newest-active-first with their last line.
- ChatListScreen: the messages inbox (tap a conversation → /chat/:pubkey).
- Drawer 'Chat' is now a live destination -> /messages (gated like Market).
- i18n en/es/pt. conversations() covered by a plain test (no widget hang).

Analyzer clean.

apps/app_seeds/lib/i18n/en.i18n.json

@@ -361,6 +361,10 @@
     "locationFailed": "Couldn't get your location — check that location is on and the permission is granted",
     "queued": "Saved — we'll share these when you're connected"
   },
+  "chatList": {
+    "title": "Messages",
+    "empty": "No conversations yet. Message someone from the market."
+  },
   "chat": {
     "title": "Chat",
     "hint": "Write a message…",

apps/app_seeds/lib/i18n/es.i18n.json

@@ -361,6 +361,10 @@
     "locationFailed": "No se pudo obtener tu ubicación — comprueba que la ubicación está activada y el permiso concedido",
     "queued": "Guardado — las compartiremos cuando tengas conexión"
   },
+  "chatList": {
+    "title": "Mensajes",
+    "empty": "Aún no hay conversaciones. Escribe a alguien desde el mercado."
+  },
   "chat": {
     "title": "Chat",
     "hint": "Escribe un mensaje…",

apps/app_seeds/lib/i18n/pt.i18n.json

@@ -357,6 +357,10 @@
     "locationFailed": "Não foi possível obter a tua localização — verifica se a localização está ativa e a permissão concedida",
     "queued": "Guardado — vamos partilhá-las quando tiveres ligação"
   },
+  "chatList": {
+    "title": "Mensagens",
+    "empty": "Ainda não há conversas. Escreve a alguém a partir do mercado."
+  },
   "chat": {
     "title": "Conversa",
     "hint": "Escreve uma mensagem…",

apps/app_seeds/lib/i18n/strings.g.dart

@@ -4,9 +4,9 @@
 /// To regenerate, run: `dart run slang`
 ///
 /// Locales: 3
-/// Strings: 992 (330 per locale)
+/// Strings: 998 (332 per locale)
 ///
-/// Built on 2026-07-10 at 10:09 UTC
+/// Built on 2026-07-10 at 10:26 UTC
 
 // coverage:ignore-file
 // ignore_for_file: type=lint, unused_import

apps/app_seeds/lib/i18n/strings_en.g.dart

@@ -70,6 +70,7 @@ class Translations with BaseTranslations<AppLocale, Translations> {
 	late final Translations$desiccant$en desiccant = Translations$desiccant$en.internal(_root);
 	late final Translations$unit$en unit = Translations$unit$en.internal(_root);
 	late final Translations$market$en market = Translations$market$en.internal(_root);
+	late final Translations$chatList$en chatList = Translations$chatList$en.internal(_root);
 	late final Translations$chat$en chat = Translations$chat$en.internal(_root);
 	late final Translations$trust$en trust = Translations$trust$en.internal(_root);
 }
@@ -1142,6 +1143,21 @@ class Translations$market$en {
 	String get queued => 'Saved — we\'ll share these when you\'re connected';
 }
 
+// Path: chatList
+class Translations$chatList$en {
+	Translations$chatList$en.internal(this._root);
+
+	final Translations _root; // ignore: unused_field
+
+	// Translations
+
+	/// en: 'Messages'
+	String get title => 'Messages';
+
+	/// en: 'No conversations yet. Message someone from the market.'
+	String get empty => 'No conversations yet. Message someone from the market.';
+}
+
 // Path: chat
 class Translations$chat$en {
 	Translations$chat$en.internal(this._root);
@@ -1969,6 +1985,8 @@ extension on Translations {
 			'market.useLocation' => 'Use my approximate location',
 			'market.locationFailed' => 'Couldn\'t get your location — check that location is on and the permission is granted',
 			'market.queued' => 'Saved — we\'ll share these when you\'re connected',
+			'chatList.title' => 'Messages',
+			'chatList.empty' => 'No conversations yet. Message someone from the market.',
 			'chat.title' => 'Chat',
 			'chat.hint' => 'Write a message…',
 			'chat.send' => 'Send',

apps/app_seeds/lib/i18n/strings_es.g.dart

@@ -69,6 +69,7 @@ class TranslationsEs extends Translations with BaseTranslations<AppLocale, Trans
 	@override late final _Translations$desiccant$es desiccant = _Translations$desiccant$es._(_root);
 	@override late final _Translations$unit$es unit = _Translations$unit$es._(_root);
 	@override late final _Translations$market$es market = _Translations$market$es._(_root);
+	@override late final _Translations$chatList$es chatList = _Translations$chatList$es._(_root);
 	@override late final _Translations$chat$es chat = _Translations$chat$es._(_root);
 	@override late final _Translations$trust$es trust = _Translations$trust$es._(_root);
 }
@@ -634,6 +635,17 @@ class _Translations$market$es extends Translations$market$en {
 	@override String get queued => 'Guardado — las compartiremos cuando tengas conexión';
 }
 
+// Path: chatList
+class _Translations$chatList$es extends Translations$chatList$en {
+	_Translations$chatList$es._(TranslationsEs root) : this._root = root, super.internal(root);
+
+	final TranslationsEs _root; // ignore: unused_field
+
+	// Translations
+	@override String get title => 'Mensajes';
+	@override String get empty => 'Aún no hay conversaciones. Escribe a alguien desde el mercado.';
+}
+
 // Path: chat
 class _Translations$chat$es extends Translations$chat$en {
 	_Translations$chat$es._(TranslationsEs root) : this._root = root, super.internal(root);
@@ -1325,6 +1337,8 @@ extension on TranslationsEs {
 			'market.useLocation' => 'Usar mi ubicación aproximada',
 			'market.locationFailed' => 'No se pudo obtener tu ubicación — comprueba que la ubicación está activada y el permiso concedido',
 			'market.queued' => 'Guardado — las compartiremos cuando tengas conexión',
+			'chatList.title' => 'Mensajes',
+			'chatList.empty' => 'Aún no hay conversaciones. Escribe a alguien desde el mercado.',
 			'chat.title' => 'Chat',
 			'chat.hint' => 'Escribe un mensaje…',
 			'chat.send' => 'Enviar',

apps/app_seeds/lib/i18n/strings_pt.g.dart

@@ -69,6 +69,7 @@ class TranslationsPt extends Translations with BaseTranslations<AppLocale, Trans
 	@override late final _Translations$desiccant$pt desiccant = _Translations$desiccant$pt._(_root);
 	@override late final _Translations$unit$pt unit = _Translations$unit$pt._(_root);
 	@override late final _Translations$market$pt market = _Translations$market$pt._(_root);
+	@override late final _Translations$chatList$pt chatList = _Translations$chatList$pt._(_root);
 	@override late final _Translations$chat$pt chat = _Translations$chat$pt._(_root);
 	@override late final _Translations$trust$pt trust = _Translations$trust$pt._(_root);
 }
@@ -630,6 +631,17 @@ class _Translations$market$pt extends Translations$market$en {
 	@override String get queued => 'Guardado — vamos partilhá-las quando tiveres ligação';
 }
 
+// Path: chatList
+class _Translations$chatList$pt extends Translations$chatList$en {
+	_Translations$chatList$pt._(TranslationsPt root) : this._root = root, super.internal(root);
+
+	final TranslationsPt _root; // ignore: unused_field
+
+	// Translations
+	@override String get title => 'Mensagens';
+	@override String get empty => 'Ainda não há conversas. Escreve a alguém a partir do mercado.';
+}
+
 // Path: chat
 class _Translations$chat$pt extends Translations$chat$en {
 	_Translations$chat$pt._(TranslationsPt root) : this._root = root, super.internal(root);
@@ -1317,6 +1329,8 @@ extension on TranslationsPt {
 			'market.useLocation' => 'Usar a minha localização aproximada',
 			'market.locationFailed' => 'Não foi possível obter a tua localização — verifica se a localização está ativa e a permissão concedida',
 			'market.queued' => 'Guardado — vamos partilhá-las quando tiveres ligação',
+			'chatList.title' => 'Mensagens',
+			'chatList.empty' => 'Ainda não há conversas. Escreve a alguém a partir do mercado.',
 			'chat.title' => 'Conversa',
 			'chat.hint' => 'Escreve uma mensagem…',
 			'chat.send' => 'Enviar',