fix(agent): Agent Inbox window polish — focus ring, duplicate title, RU label (#1340)

Fixes #1339. Three small Agent Inbox chrome defects:

A. Focus ring: the root container was marked .focusable() + .focused(),
   drawing the system focus ring around the whole window content on macOS.
   Keyboard navigation needs the container focusable, so keep .focusable()
   and add .focusEffectDisabled() (macOS 26+) to suppress the ring while
   preserving arrow-key/Return handling.

B. Duplicate title: the in-window header Label reused the same key as the
   window title bar (menu.agentInbox), so 'Agent Inbox' appeared twice.
   Remove the duplicate header label; keep the transient navigation/recovery
   message banner (now shown only when a message is active, with its Divider).

C. RU translation: 'Входящие агентов' reads as 'agents who entered' rather
   than 'agents\' inbox'. Changed to 'Входящие от агентов' via a targeted
   text edit (single-line xcstrings diff; no json.dump re-serialization).

Author: batonogov

Pine/Agent/AgentInboxView.swift

@@ -23,22 +23,23 @@ struct AgentInboxView: View {
 
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
-            HStack {
-                Label(Strings.agentInboxTitle, systemImage: MenuIcons.agentInbox)
-                    .font(.title2.weight(.semibold))
-                Spacer()
-                if let navigationMessage {
+            // The window title bar already names the Agent Inbox; show a
+            // transient banner only when a navigation/recovery message is
+            // active (#1339 — removed the duplicate in-window header label).
+            if let navigationMessage {
+                HStack {
+                    Spacer()
                     Label(navigationMessage, systemImage: "exclamationmark.triangle")
                         .font(.caption)
                         .foregroundStyle(.orange)
                         .accessibilityIdentifier(
                             AccessibilityID.agentInboxNavigationStatus
                         )
                 }
-            }
-            .padding()
+                .padding()
 
-            Divider()
+                Divider()
+            }
 
             if snapshot.isEmpty {
                 ContentUnavailableView {
@@ -53,6 +54,7 @@ struct AgentInboxView: View {
         .frame(minWidth: 420, idealWidth: 720, minHeight: 360, idealHeight: 560)
         .focusable()
         .focused($hasKeyboardFocus)
+        .focusEffectDisabled()
         .onAppear {
             synchronizeSelection()
             hasKeyboardFocus = true

Pine/Localizable.xcstrings

@@ -31951,7 +31951,7 @@
         "ru": {
           "stringUnit": {
             "state": "translated",
-            "value": "Входящие агентов"
+            "value": "Входящие от агентов"
           }
         },
         "zh-Hans": {