Show workspace commits clearly in Changes (#2350)

* feat(commits): distinguish workspace history from base commits

Keep every workspace commit visible while bounding base history to ten
context commits, and make push and base state readable in the commit rail.

* fix(commits): preserve history when base refs disappear

Fall back to recent HEAD history for stale saved bases, and reject truncated
git output instead of presenting an incomplete commit list.

* fix(commits): classify history against the current base

Use the furthest-ahead local or remote base for classification, and re-infer
base history when saved worktree metadata points to a deleted branch.

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

@@ -817,7 +817,7 @@ export const ptBR: TranslationResources = {
         deletedFile: "Excluído",
         commits: {
           title: "Commits",
-          countLabel: "{{count}} commits recentes",
+          countLabel: "{{count}} commits do espaço de trabalho",
           fileDiffEmpty: "Nenhuma alteração para exibir",
           fileDiffError: "Falha ao carregar diff do arquivo",
           loading: "Carregando commits…",