Refine tool call summaries and scrolling (#2069)

* feat(app): refine tool call summaries and scrolling

Keep summary groups stable from the first tool call, preserve live activity feedback, and scroll expanded groups to the latest entry. Consolidate web scrollbar styling around the native browser mechanism.

* refactor(app): reuse tool call height constant

* fix(app): preserve tool call summary state

* fix(app): refresh web tool groups on expand

* fix(app): preserve grouped tool errors

packages/app/src/i18n/resources/pt-BR.ts

@@ -1418,8 +1418,6 @@ export const ptBR: TranslationResources = {
     output: "Saída",
   },
   toolCallGroup: {
-    title: "Ferramentas",
-    accessibilityLabel: "Ferramentas, {{count}} chamadas",
     editedFiles: {
       one: "editou {{count}} arquivo",
       other: "editou {{count}} arquivos",
@@ -1546,13 +1544,12 @@ export const ptBR: TranslationResources = {
           "Mostrar os blocos de pensamento e raciocínio do agente totalmente expandidos por padrão",
       },
       toolCallDetail: {
-        label: "Detalhe das chamadas de ferramentas",
-        description: "Como a atividade das ferramentas aparece na linha do tempo do agente",
-        accessibilityLabel: "Selecionar detalhe das ferramentas ({{value}})",
+        label: "Exibição de chamadas de ferramentas",
+        description: "Como as chamadas de ferramentas aparecem na linha do tempo",
+        accessibilityLabel: "Selecionar exibição de chamadas de ferramentas ({{value}})",
         options: {
-          overview: "Visão geral",
-          concise: "Conciso",
-          detailed: "Detalhado",
+          overview: "Resumo",
+          detailed: "Detalhes completos",
         },
       },
       language: {