Make the workspace right pane a first-class tab host (#3287)

* feat(app): add persistent workspace side panes

Keep the common review and file-browsing workflow beside the active agent without tearing down pane contents. Workspace tabs now share one compact chip language, assistant file links route into the retained right pane, and diff/file trees share stable geometry.

* fix(app): localize pull request empty state

* test(app): update explorer pane coverage

* fix(app): preserve explorer pane workflows

* test(app): make explorer tab selection idempotent

* fix(app): persist workspace review pins

* fix(app): preserve sidebar scrim drag hook

* fix(app): restore companion pane interactions

* test(app): follow selected sidebar surface

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

@@ -591,6 +591,7 @@ export const ptBR: TranslationResources = {
         renameAgent: "Renomear agente",
       },
       actions: {
+        newTab: "Nova aba",
         newAgent: "Novo agente",
         newTerminal: "Novo terminal",
         preparingTerminal: "Preparando aba de terminal",
@@ -599,6 +600,9 @@ export const ptBR: TranslationResources = {
         exitFocusMode: "Sair do modo de foco",
         splitRight: "Dividir painel à direita",
         splitDown: "Dividir painel abaixo",
+        changes: "Alterações",
+        files: "Arquivos",
+        pullRequest: "Pull request",
         terminalProfilesMenu: "Perfis de terminal",
         editTerminalProfiles: "Editar perfis…",
         pinTarget: "Fixar",
@@ -1687,6 +1691,17 @@ export const ptBR: TranslationResources = {
         reloadMessage: "Suas alterações locais serão perdidas.",
       },
     },
+    files: {
+      label: "Arquivos",
+      subtitle: "Arquivos do espaço de trabalho",
+      tooltip: "Explorar arquivos do espaço de trabalho",
+    },
+    pullRequest: {
+      label: "Pull request",
+      subtitle: "Detalhes do pull request",
+      emptyTitle: "Ainda não há pull request",
+      emptyDescription: "Crie um pull request para este checkout para ver os detalhes aqui.",
+    },
     diff: {
       changesLabel: "Alterações",
       changesSubtitle: "Diff da árvore de trabalho",