feat(journal): edit a placed bet

Adds an edit flow to the bet journal — an Edit button per row repurposes the inline
entry form (edit mode), saving via a new UpdatePlacedBetUseCase that preserves the
original placed-at and re-grades the outcome against the result (so a changed
selection/event re-settles). A cancel affordance + an editing banner make the mode
obvious; the submit button switches to "Save changes".

- UpdatePlacedBetUseCase (loads existing for PlacedAt, validates the event, re-grades)
  + IBetJournalService.UpdateAsync + service impl; Journal page edit-mode state +
  per-row Edit button; en/ru resx.
- 3 tests: unknown-bet, unknown-event, and preserve-PlacedAt + re-grade.

src/Marathon.UI/Pages/MyBets/Journal.razor

@@ -259,14 +259,28 @@
                     <p class="m-journal__form-error" data-test="journal-add-error">@_formError</p>
                 }
 
+                @if (_editingId is not null)
+                {
+                    <p class="m-journal__form-hint" data-test="journal-editing-banner">@L["Journal.Editing"]</p>
+                }
+
                 <div class="m-journal__form-actions">
+                    @if (_editingId is not null)
+                    {
+                        <button type="button"
+                                class="m-chip m-journal__chip"
+                                @onclick="CancelEdit"
+                                data-test="journal-edit-cancel">
+                            @L["Journal.Action.Cancel"]
+                        </button>
+                    }
                     <button type="button"
                             class="m-chip m-journal__submit"
                             @onclick="SubmitAsync"
                             disabled="@_submitting"
                             data-test="journal-add-submit">
-                        <span class="m-journal__chip-glyph @(_submitting ? "is-spinning" : null)" aria-hidden="true">+</span>
-                        <span>@L["Journal.Action.Submit"]</span>
+                        <span class="m-journal__chip-glyph @(_submitting ? "is-spinning" : null)" aria-hidden="true">@(_editingId is null ? "+" : "✓")</span>
+                        <span>@(_editingId is null ? L["Journal.Action.Submit"] : L["Journal.Action.SaveEdit"])</span>
                     </button>
                 </div>
             </article>
@@ -359,6 +373,14 @@
                                         }
                                         else
                                         {
+                                            <button type="button"
+                                                    class="m-chip m-journal__chip m-journal__chip--ghost"
+                                                    @onclick="@(() => BeginEdit(row))"
+                                                    data-test="@($"journal-edit-{row.Id}")"
+                                                    aria-label="@L["Journal.Action.EditBet"]">
+                                                <span aria-hidden="true">✎</span>
+                                                <span>@L["Journal.Action.EditBet"]</span>
+                                            </button>
                                             <button type="button"
                                                     class="m-chip m-journal__chip m-journal__chip--ghost"
                                                     @onclick="@(() => RequestDelete(row.Id))"
@@ -702,6 +724,7 @@
     private bool _resolving;
     private string? _formError;
     private Guid? _pendingDeleteId;
+    private Guid? _editingId;
     private AddBetForm _form = new();
 
     // Kelly stake-helper state — page-local (not persisted with the bet). Bankroll
@@ -851,10 +874,19 @@
         var ct = _loadCts?.Token ?? CancellationToken.None;
         try
         {
-            await Service.AddAsync(_form, ct);
+            if (_editingId is { } editId)
+            {
+                await Service.UpdateAsync(editId, _form, ct);
+                Snackbar.Add(L["Journal.Edited"].Value, Severity.Success);
+            }
+            else
+            {
+                await Service.AddAsync(_form, ct);
+                Snackbar.Add(L["Journal.Submitted"].Value, Severity.Success);
+            }
+            _editingId = null;
             _form = new AddBetForm();
             _formError = null;
-            Snackbar.Add(L["Journal.Submitted"].Value, Severity.Success);
             await LoadAsync();
         }
         catch (ArgumentException ex)
@@ -891,6 +923,31 @@
         }
     }
 
+    private void BeginEdit(BetJournalRowVm row)
+    {
+        var b = row.Bet;
+        _editingId = row.Id;
+        _pendingDeleteId = null;
+        _form = new AddBetForm
+        {
+            EventId = b.EventId.Value,
+            Type = b.Selection.Type,
+            Side = b.Selection.Side,
+            Value = b.Selection.Value?.Value,
+            Rate = b.Selection.Rate.Value,
+            Stake = b.Stake,
+            Notes = b.Notes,
+        };
+        _formError = null;
+    }
+
+    private void CancelEdit()
+    {
+        _editingId = null;
+        _form = new AddBetForm();
+        _formError = null;
+    }
+
     private void RequestDelete(Guid id)
     {
         _pendingDeleteId = id;

src/Marathon.UI/Resources/SharedResource.en.resx

@@ -424,6 +424,10 @@
   <data name="Journal.Action.Refresh"><value>Refresh</value></data>
   <data name="Journal.Action.Resolve"><value>Resolve pending</value></data>
   <data name="Journal.Action.Submit"><value>Record bet</value></data>
+  <data name="Journal.Action.SaveEdit"><value>Save changes</value></data>
+  <data name="Journal.Action.EditBet"><value>Edit</value></data>
+  <data name="Journal.Edited"><value>Bet updated.</value></data>
+  <data name="Journal.Editing"><value>Editing an existing bet — save to apply your changes, or cancel.</value></data>
   <data name="Journal.Action.Delete"><value>Delete</value></data>
   <data name="Journal.Action.Confirm"><value>Confirm</value></data>
   <data name="Journal.Action.Cancel"><value>Cancel</value></data>

src/Marathon.UI/Resources/SharedResource.ru.resx

@@ -437,6 +437,10 @@
   <data name="Journal.Action.Refresh"><value>Обновить</value></data>
   <data name="Journal.Action.Resolve"><value>Рассчитать ожидающие</value></data>
   <data name="Journal.Action.Submit"><value>Записать</value></data>
+  <data name="Journal.Action.SaveEdit"><value>Сохранить изменения</value></data>
+  <data name="Journal.Action.EditBet"><value>Изменить</value></data>
+  <data name="Journal.Edited"><value>Ставка обновлена.</value></data>
+  <data name="Journal.Editing"><value>Редактирование ставки — сохраните изменения или отмените.</value></data>
   <data name="Journal.Action.Delete"><value>Удалить</value></data>
   <data name="Journal.Action.Confirm"><value>Подтвердить</value></data>
   <data name="Journal.Action.Cancel"><value>Отмена</value></data>

src/Marathon.UI/Services/BetJournalService.cs

@@ -19,6 +19,7 @@ public sealed class BetJournalService : IBetJournalService
     private readonly RecordPlacedBetUseCase _record;
     private readonly ResolvePendingBetsUseCase _resolve;
     private readonly DeletePlacedBetUseCase _delete;
+    private readonly UpdatePlacedBetUseCase _update;
     private readonly IEventRepository _events;
 
     public BetJournalService(
@@ -26,12 +27,14 @@ public sealed class BetJournalService : IBetJournalService
         RecordPlacedBetUseCase record,
         ResolvePendingBetsUseCase resolve,
         DeletePlacedBetUseCase delete,
+        UpdatePlacedBetUseCase update,
         IEventRepository events)
     {
         _build = build ?? throw new ArgumentNullException(nameof(build));
         _record = record ?? throw new ArgumentNullException(nameof(record));
         _resolve = resolve ?? throw new ArgumentNullException(nameof(resolve));
         _delete = delete ?? throw new ArgumentNullException(nameof(delete));
+        _update = update ?? throw new ArgumentNullException(nameof(update));
         _events = events ?? throw new ArgumentNullException(nameof(events));
     }
 
@@ -92,6 +95,29 @@ public sealed class BetJournalService : IBetJournalService
         return stored.Id;
     }
 
+    public async Task UpdateAsync(Guid betId, AddBetForm form, CancellationToken ct)
+    {
+        ArgumentNullException.ThrowIfNull(form);
+
+        if (!form.IsValid(out var error))
+            throw new ArgumentException(error ?? "Invalid form.", nameof(form));
+
+        var selection = new Bet(
+            scope: MatchScope.Instance,
+            type: form.Type,
+            side: form.Side,
+            value: form.Value is { } v ? new OddsValue(v) : null,
+            rate: new OddsRate(form.Rate));
+
+        await _update.ExecuteAsync(
+            betId,
+            new DomainEventId(form.EventId.Trim()),
+            selection,
+            form.Stake,
+            form.Notes,
+            ct).ConfigureAwait(false);
+    }
+
     public Task DeleteAsync(Guid betId, CancellationToken ct) =>
         _delete.ExecuteAsync(betId, ct);
 

src/Marathon.UI/Services/IBetJournalService.cs

@@ -18,6 +18,14 @@ public interface IBetJournalService
     /// <exception cref="ArgumentException">Form fails its own validation.</exception>
     Task<Guid> AddAsync(AddBetForm form, CancellationToken ct);
 
+    /// <summary>
+    /// Updates an existing bet's selection / stake / notes, preserving its original
+    /// placed-at and re-grading against the event result.
+    /// </summary>
+    /// <exception cref="ArgumentException">Form fails its own validation.</exception>
+    /// <exception cref="InvalidOperationException">The bet id or its event is unknown.</exception>
+    Task UpdateAsync(Guid betId, AddBetForm form, CancellationToken ct);
+
     /// <summary>Removes a bet by id. No-op when the id is unknown.</summary>
     Task DeleteAsync(Guid betId, CancellationToken ct);