WIP(initial-implementation): parallel batch P2/P3/P5 — code complete, unreviewed

Snapshot of the parallel batch (Phases 2 + 3 + 5) at session pause. Solution does
NOT build cleanly yet — known cross-phase compile issues remain to be resolved
before review. See plans/initial-implementation/PLAN.md "Resume Notes" section
for the exact tomorrow-morning action list.

Phase 2 (Storage):
- Repository interfaces in Marathon.Application/Abstractions
- DateRange, ExportKind, StorageOptions in Marathon.Application/Storage
- EF Core 8 + SQLite (WAL) persistence: 7 entities + configurations + 4 repos
- Hand-written InitialCreate migration (dotnet ef blocked by parallel work)
- ClosedXML ExcelExporter with exact customer-spec wide columns
- PersistenceModule.AddMarathonPersistence DI extension
- Round-trip + export tests (cannot run yet — see cross-phase issues)

Phase 3 (Scraping):
- IOddsScraper, IBetPlacer in Marathon.Application/Abstractions
- ScrapingOptions in Marathon.Infrastructure/Configuration
- MarathonbetScraper with 4 parsers (Upcoming, Live, EventOdds, Results)
- Helpers: ServerTimeProvider, PeriodScopeMapper, OutcomeCodeMapper, MoscowDateParser
- UserAgentRotatorHandler + Polly v8 resilience pipeline
- ScrapingModule.AddMarathonScraping DI extension
- GlobalUsings.cs aliases for EventId / Configuration disambiguation
- Parser tests with trimmed HTML fixtures
- ScrapeResultsAsync interim no-op (Phase 8 will replace via watch-list polling)

Phase 5 (UI shell — killed mid-final-verify, assumed ~95%):
- Marathon.UI populated: MainLayout, App.razor, Pages (Home, Settings),
  Components, Theme (MarathonTheme.cs + Tokens.cs + app.css), Resources
  (SharedResource.{cs,ru.resx,en.resx}), Services (ISettingsWriter), wwwroot
- WPF host: App.xaml(.cs), MainWindow.xaml(.cs), Marathon.Hosts.WpfBlazor.csproj
  with Microsoft.AspNetCore.Components.WebView.Wpf + MudBlazor + Serilog
- appsettings.json + appsettings.Development.json with all sections wired
- bUnit tests: MainLayoutTests, LocaleSwitcherTests, ThemeToggleTests,
  JsonSettingsWriterTests + Support helpers

Cross-phase issues to resolve at next session:
1. Phase 2 repository classes are 'internal' — Phase 3's tests can't reference
   them. Fix: add InternalsVisibleTo to Marathon.Infrastructure.csproj.
2. Phase 5: LocalizationOptions namespace ambiguity (AspNetCore vs Extensions).
3. Phase 5: WpfBlazor Serilog API mismatch.

Reviewer has NOT run on this batch. Move to Phase 4 only after build is green
and a combined parallel-batch reviewer passes.

src/Marathon.UI/Pages/Settings.razor

@@ -0,0 +1,272 @@
+@page "/settings"
+@using Marathon.Application.Storage
+@using LocalizationOptions = Marathon.UI.Services.LocalizationOptions
+@inject IStringLocalizer<SharedResource> L
+@inject IOptionsMonitor<ScrapingSettingsForm> ScrapingOpts
+@inject IOptionsMonitor<WorkerOptions> WorkerOpts
+@inject IOptionsMonitor<StorageOptions> StorageOpts
+@inject IOptionsMonitor<AnomalyOptions> AnomalyOpts
+@inject IOptionsMonitor<Marathon.UI.Services.LocalizationOptions> LocaleOpts
+@inject ISettingsWriter Writer
+@inject IDialogService Dialogs
+@inject ISnackbar Snackbar
+@inject ILogger<Settings> Logger
+
+<PageTitle>@L["App.Title"] · @L["Settings.Title"]</PageTitle>
+
+<section class="m-shell">
+    <header class="m-rise m-rise-1" style="display: grid; gap: var(--m-space-3); max-width: 880px;">
+        <span class="m-kicker">@L["Settings.Kicker"]</span>
+        <h1 class="m-display" style="font-size: clamp(2rem, 4vw, 3rem);">@L["Settings.Title"]</h1>
+        <p style="color: var(--m-c-ink-soft); max-width: 70ch;">@L["Settings.Lede"]</p>
+    </header>
+
+    <hr class="m-rule--double" />
+
+    @* SCRAPING *@
+    <article class="m-section m-rise m-rise-2">
+        <header class="m-section__head">
+            <h2>@L["Settings.Section.Scraping"]</h2>
+            <MudButton Variant="Variant.Text"
+                       Size="Size.Small"
+                       OnClick="@(() => ResetSectionAsync(ScrapingSettingsForm.SectionName))">
+                @L["Settings.Action.Reset"]
+            </MudButton>
+        </header>
+        <div class="m-section__body">
+            <Field Label="@L["Settings.Scraping.PollingIntervalSeconds"]" Hint="@L["Settings.Scraping.PollingIntervalSeconds.Hint"]">
+                <MudNumericField T="int" @bind-Value="_scraping.PollingIntervalSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.MaxConcurrentRequests"]" Hint="@L["Settings.Scraping.MaxConcurrentRequests.Hint"]">
+                <MudNumericField T="int" @bind-Value="_scraping.MaxConcurrentRequests" Min="1" Max="16" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.RateLimitRps"]" Hint="@L["Settings.Scraping.RateLimitRps.Hint"]">
+                <MudNumericField T="int" @bind-Value="_scraping.RateLimit.RequestsPerSecond" Min="1" Max="20" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.RetryMaxAttempts"]">
+                <MudNumericField T="int" @bind-Value="_scraping.RetryPolicy.MaxAttempts" Min="0" Max="10" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.RetryBaseDelayMs"]">
+                <MudNumericField T="int" @bind-Value="_scraping.RetryPolicy.BaseDelayMs" Min="100" Max="60000" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.BaseUrl"]">
+                <MudTextField T="string" @bind-Value="_scraping.BaseUrl" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.RequestTimeoutSeconds"]">
+                <MudNumericField T="int" @bind-Value="_scraping.RequestTimeoutSeconds" Min="5" Max="600" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.UserAgents"]" Hint="@L["Settings.Scraping.UserAgents.Hint"]">
+                <MudTextField T="string"
+                              Value="@_userAgentsRaw"
+                              ValueChanged="@OnUserAgentsChanged"
+                              Lines="4"
+                              Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Scraping.UsePlaywright"]">
+                <MudSwitch T="bool" @bind-Value="_scraping.UsePlaywright" Color="Color.Primary" />
+            </Field>
+
+            <SectionFooter OnSave="@(() => SaveSectionAsync(ScrapingSettingsForm.SectionName, _scraping))" />
+        </div>
+    </article>
+
+    @* WORKERS *@
+    <article class="m-section m-rise m-rise-3">
+        <header class="m-section__head">
+            <h2>@L["Settings.Section.Workers"]</h2>
+            <MudButton Variant="Variant.Text" Size="Size.Small"
+                       OnClick="@(() => ResetSectionAsync(WorkerOptions.SectionName))">
+                @L["Settings.Action.Reset"]
+            </MudButton>
+        </header>
+        <div class="m-section__body">
+            <Field Label="@L["Settings.Workers.UpcomingScheduleCron"]" Hint="@L["Settings.Workers.UpcomingScheduleCron.Hint"]">
+                <MudTextField T="string" @bind-Value="_workers.UpcomingScheduleCron" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Workers.UpcomingPollerEnabled"]">
+                <MudSwitch T="bool" @bind-Value="_workers.UpcomingPollerEnabled" Color="Color.Primary" />
+            </Field>
+            <Field Label="@L["Settings.Workers.LivePollerEnabled"]">
+                <MudSwitch T="bool" @bind-Value="_workers.LivePollerEnabled" Color="Color.Primary" />
+            </Field>
+
+            <SectionFooter OnSave="@(() => SaveSectionAsync(WorkerOptions.SectionName, _workers))" />
+        </div>
+    </article>
+
+    @* STORAGE *@
+    <article class="m-section m-rise m-rise-4">
+        <header class="m-section__head">
+            <h2>@L["Settings.Section.Storage"]</h2>
+            <MudButton Variant="Variant.Text" Size="Size.Small"
+                       OnClick="@(() => ResetSectionAsync(StorageOptions.SectionName))">
+                @L["Settings.Action.Reset"]
+            </MudButton>
+        </header>
+        <div class="m-section__body">
+            <Field Label="@L["Settings.Storage.DatabasePath"]">
+                <MudTextField T="string" @bind-Value="_storage.DatabasePath" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Storage.ExportDirectory"]">
+                <MudTextField T="string" @bind-Value="_storage.ExportDirectory" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Storage.SnapshotRetentionDays"]">
+                <MudNumericField T="int" @bind-Value="_storage.SnapshotRetentionDays" Min="1" Max="3650" Variant="Variant.Outlined" />
+            </Field>
+
+            <SectionFooter OnSave="@(() => SaveSectionAsync(StorageOptions.SectionName, _storage))" />
+        </div>
+    </article>
+
+    @* ANOMALY *@
+    <article class="m-section m-rise m-rise-5">
+        <header class="m-section__head">
+            <h2>@L["Settings.Section.Anomaly"]</h2>
+            <MudButton Variant="Variant.Text" Size="Size.Small"
+                       OnClick="@(() => ResetSectionAsync(AnomalyOptions.SectionName))">
+                @L["Settings.Action.Reset"]
+            </MudButton>
+        </header>
+        <div class="m-section__body">
+            <Field Label="@L["Settings.Anomaly.SuspensionGapSeconds"]">
+                <MudNumericField T="int" @bind-Value="_anomaly.SuspensionGapSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Anomaly.OddsFlipThreshold"]">
+                <MudNumericField T="decimal" @bind-Value="_anomaly.OddsFlipThreshold" Min="0.01m" Max="1m" Step="0.01m" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Anomaly.MinSnapshotCount"]">
+                <MudNumericField T="int" @bind-Value="_anomaly.MinSnapshotCount" Min="2" Max="100" Variant="Variant.Outlined" />
+            </Field>
+            <Field Label="@L["Settings.Anomaly.DetectionIntervalSeconds"]">
+                <MudNumericField T="int" @bind-Value="_anomaly.DetectionIntervalSeconds" Min="5" Max="3600" Variant="Variant.Outlined" />
+            </Field>
+
+            <SectionFooter OnSave="@(() => SaveSectionAsync(AnomalyOptions.SectionName, _anomaly))" />
+        </div>
+    </article>
+
+    @* LOCALIZATION *@
+    <article class="m-section m-rise m-rise-5">
+        <header class="m-section__head">
+            <h2>@L["Settings.Section.Localization"]</h2>
+            <MudButton Variant="Variant.Text" Size="Size.Small"
+                       OnClick="@(() => ResetSectionAsync(LocalizationOptions.SectionName))">
+                @L["Settings.Action.Reset"]
+            </MudButton>
+        </header>
+        <div class="m-section__body">
+            <Field Label="@L["Settings.Localization.DefaultCulture"]">
+                <MudSelect T="string" @bind-Value="_locale.DefaultCulture" Variant="Variant.Outlined">
+                    <MudSelectItem T="string" Value="@LocaleState.Russian">@L["Locale.Russian"] · ru-RU</MudSelectItem>
+                    <MudSelectItem T="string" Value="@LocaleState.English">@L["Locale.English"] · en-US</MudSelectItem>
+                </MudSelect>
+            </Field>
+
+            <SectionFooter OnSave="@(() => SaveSectionAsync(LocalizationOptions.SectionName, _locale))" />
+        </div>
+    </article>
+</section>
+
+@code {
+    private ScrapingSettingsForm _scraping = new();
+    private WorkerOptions _workers = new();
+    private StorageOptions _storage = new();
+    private AnomalyOptions _anomaly = new();
+    private LocalizationOptions _locale = new();
+    private string _userAgentsRaw = string.Empty;
+
+    protected override void OnInitialized()
+    {
+        _scraping = ScrapingOpts.CurrentValue.Clone();
+        _userAgentsRaw = string.Join('\n', _scraping.UserAgents ?? Array.Empty<string>());
+
+        _workers = new WorkerOptions
+        {
+            UpcomingScheduleCron = WorkerOpts.CurrentValue.UpcomingScheduleCron,
+            LivePollerEnabled = WorkerOpts.CurrentValue.LivePollerEnabled,
+            UpcomingPollerEnabled = WorkerOpts.CurrentValue.UpcomingPollerEnabled,
+        };
+
+        _storage = new StorageOptions
+        {
+            DatabasePath = StorageOpts.CurrentValue.DatabasePath,
+            ExportDirectory = StorageOpts.CurrentValue.ExportDirectory,
+            SnapshotRetentionDays = StorageOpts.CurrentValue.SnapshotRetentionDays,
+        };
+
+        _anomaly = new AnomalyOptions
+        {
+            SuspensionGapSeconds = AnomalyOpts.CurrentValue.SuspensionGapSeconds,
+            OddsFlipThreshold = AnomalyOpts.CurrentValue.OddsFlipThreshold,
+            MinSnapshotCount = AnomalyOpts.CurrentValue.MinSnapshotCount,
+            DetectionIntervalSeconds = AnomalyOpts.CurrentValue.DetectionIntervalSeconds,
+        };
+
+        _locale = new LocalizationOptions { DefaultCulture = LocaleOpts.CurrentValue.DefaultCulture };
+    }
+
+    private void OnUserAgentsChanged(string raw)
+    {
+        _userAgentsRaw = raw;
+        _scraping.UserAgents = (raw ?? string.Empty)
+            .Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries);
+    }
+
+    private async Task SaveSectionAsync<T>(string section, T payload) where T : class
+    {
+        var confirmed = await ConfirmAsync();
+        if (!confirmed)
+        {
+            return;
+        }
+
+        try
+        {
+            await Writer.SaveSectionAsync(section, payload);
+            Snackbar.Add(L["Settings.Saved"], Severity.Success);
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError(ex, "Failed to save section {Section}", section);
+            Snackbar.Add(L["Settings.SaveFailed"], Severity.Error);
+        }
+    }
+
+    private async Task ResetSectionAsync(string section)
+    {
+        var confirmed = await ConfirmAsync();
+        if (!confirmed)
+        {
+            return;
+        }
+
+        try
+        {
+            await Writer.ResetSectionAsync(section);
+            Snackbar.Add(L["Settings.Saved"], Severity.Success);
+        }
+        catch (Exception ex)
+        {
+            Logger.LogError(ex, "Failed to reset section {Section}", section);
+            Snackbar.Add(L["Settings.SaveFailed"], Severity.Error);
+        }
+    }
+
+    private async Task<bool> ConfirmAsync()
+    {
+        var parameters = new DialogParameters
+        {
+            ["ContentText"] = L["Settings.Confirm.Body"].Value,
+            ["ButtonText"] = L["Settings.Action.Save"].Value,
+            ["CancelText"] = L["Common.Cancel"].Value,
+        };
+
+        var result = await Dialogs.ShowMessageBox(
+            title: L["Settings.Confirm.Title"],
+            message: L["Settings.Confirm.Body"],
+            yesText: L["Settings.Action.Save"],
+            cancelText: L["Common.Cancel"]);
+
+        return result == true;
+    }
+}