fix(ui): resizable modal, drop branch column, show committed diff

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/ClaudeDo.Worker/Worktrees/WorktreeMaintenanceService.cs

@@ -82,7 +82,7 @@ public sealed class WorktreeMaintenanceService
                     select new
                     {
                         w.TaskId, t.Title, t.Status, ListId = l.Id, ListName = l.Name,
-                        w.Path, w.BranchName, w.State, w.DiffStat, w.CreatedAt,
+                        w.Path, w.BranchName, w.BaseCommit, w.State, w.DiffStat, w.CreatedAt,
                     };
 
         if (!string.IsNullOrEmpty(listId))
@@ -92,7 +92,7 @@ public sealed class WorktreeMaintenanceService
 
         return rows.Select(x => new WorktreeOverviewRow(
             x.TaskId, x.Title, x.Status, x.ListId, x.ListName,
-            x.Path, x.BranchName, x.State, x.DiffStat, x.CreatedAt,
+            x.Path, x.BranchName, x.BaseCommit ?? "", x.State, x.DiffStat, x.CreatedAt,
             PathExistsOnDisk: !string.IsNullOrWhiteSpace(x.Path) && Directory.Exists(x.Path))).ToList();
     }
 

src/ClaudeDo.Worker/Worktrees/WorktreeOverviewRow.cs

@@ -11,6 +11,7 @@ public sealed record WorktreeOverviewRow(
     string ListName,
     string Path,
     string BranchName,
+    string BaseCommit,
     WorktreeState State,
     string? DiffStat,
     DateTime CreatedAt,