fix(ui): make diff-stat parsing locale-safe and dedupe the two parsers

TaskRowViewModel had its own ParseDiffStat expecting "+12"/"-3" tokens that
`git diff --stat` never emits, so the row badge always showed 0/0. Meanwhile
DetailsIslandViewModel's parser matched only the English words
"insertion"/"deletion", so it broke on a localized git (e.g. German Windows:
"Einfügung(en)"/"Löschung(en)").

Row and detail badge now share one parser, anchored on git's untranslated
(+)/(-) suffix instead of the language-dependent word before it, so it reads
correctly in any locale. Also corrected the Worker CLAUDE.md's branch-name
claim (`claudedo/{taskId[:8]}`) to match the actual full-GUID branch name.

src/ClaudeDo.Ui/ViewModels/Islands/DetailsIslandViewModel.cs

@@ -1503,12 +1503,17 @@ public sealed partial class DetailsIslandViewModel : ViewModelBase, IDisposable
         catch { /* best-effort */ }
     }
 
+    // Shared by TaskRowViewModel.UpdateFromEntity — this is the one parser for
+    // `git diff --stat`'s summary line ("N insertions(+), M deletions(-)"). Anchored on the
+    // literal "(+)"/"(-)" markers rather than the English words: git for Windows localizes
+    // "insertion"/"deletion" to the OS language (e.g. German "Einfügung(en)"/"Löschung(en)"),
+    // but always keeps the untranslated (+)/(-) suffix, so this reads correctly in any locale.
     internal static (int Additions, int Deletions) ParseDiffStat(string? stat)
     {
         if (string.IsNullOrEmpty(stat)) return (0, 0);
         int add = 0, del = 0;
-        var m1 = System.Text.RegularExpressions.Regex.Match(stat, @"(\d+)\s+insertion");
-        var m2 = System.Text.RegularExpressions.Regex.Match(stat, @"(\d+)\s+deletion");
+        var m1 = System.Text.RegularExpressions.Regex.Match(stat, @"(\d+)[^,\n]*\(\+\)");
+        var m2 = System.Text.RegularExpressions.Regex.Match(stat, @"(\d+)[^,\n]*\(-\)");
         if (m1.Success) int.TryParse(m1.Groups[1].Value, out add);
         if (m2.Success) int.TryParse(m2.Groups[1].Value, out del);
         return (add, del);