feat(ui): live task updates from worker events + planning polish

Wire TasksIslandViewModel to TaskUpdated/WorktreeUpdated/TaskMessage worker
events so rows refresh without a full reload; add ForegroundHelper to permit
wt.exe to take foreground on planning launch; misc UI polish on lists, task
rows and settings modal.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/ClaudeDo.Data/Migrations/20260420075929_AddTaskFlagsAndNotes.cs

@@ -1,5 +1,3 @@
-using Microsoft.EntityFrameworkCore;
-using Microsoft.EntityFrameworkCore.Infrastructure;
 using Microsoft.EntityFrameworkCore.Migrations;
 
 #nullable disable
@@ -7,8 +5,6 @@ using Microsoft.EntityFrameworkCore.Migrations;
 namespace ClaudeDo.Data.Migrations
 {
     /// <inheritdoc />
-    [DbContext(typeof(ClaudeDoDbContext))]
-    [Migration("20260420075929_AddTaskFlagsAndNotes")]
     public partial class AddTaskFlagsAndNotes : Migration
     {
         /// <inheritdoc />