feat(cv): redesign document editing with revision-safe letters and writing tools

JobTrackerApi.Tests/Rd21JobPersistenceTests.cs

@@ -70,7 +70,7 @@ public sealed class Rd21JobPersistenceTests
                 User = new ClaimsPrincipal(new ClaimsIdentity(new[] { new Claim(ClaimTypes.NameIdentifier, user.Id) }, "test")),
             } },
         };
-        var pending = controller.Update(id, Request(companyId, "Delayed title", null, 1) with { Status = "Offer" }, default);
+        var pending = controller.Update(id, Request(companyId, "Delayed title", null, 1) with { Status = "Offer", CoverLetterText = "Uncommitted letter" }, default);
         await reached.Task.WaitAsync(TimeSpan.FromSeconds(10));
         try
         {
@@ -89,6 +89,8 @@ public sealed class Rd21JobPersistenceTests
         Assert.Equal("Prospect", saved.Status);
         Assert.Equal("Original job title", (await verify.Jobs.SingleAsync()).JobTitle);
         Assert.Empty(await verify.JobEvents.ToListAsync());
+        Assert.Empty(await verify.CoverLetterVersions.ToListAsync());
+        Assert.Null(saved.CoverLetterText);
         Assert.Empty(delayed.ChangeTracker.Entries());
 
         // A deliberate reload/review uses the winner's content and new revision, never a blind retry.
@@ -248,7 +250,7 @@ public sealed class Rd21JobPersistenceTests
         var saved = await verify.JobApplications.SingleAsync();
         Assert.Equal("First approved text", coverLetter ? saved.CoverLetterText : saved.Notes);
         Assert.Equal(409, Assert.IsAssignableFrom<ObjectResult>(rejected).StatusCode);
-        if (coverLetter) Assert.Single(await verify.CoverLetterVersions.ToListAsync());
+        if (coverLetter) Assert.Equal(2, await verify.CoverLetterVersions.CountAsync()); // Legacy baseline plus approved replacement.
     }
 
     [Theory]